Table of Contents Subject Page Central Body Electronics (ZKE III) .2 Objectives of the Module .2 Purpose of the System.3 System Components .4 Power Distribution .7 Windshield Wiping/Washing.9 Headlight Washing.10 Rear Window Wiper/Washer.11 Rain Sensor.12 Central Locking. 17 Trunklid/Tailgate.25 Remote (Keyless) Entry .26 Car Memory/Key Memory.27 Anti-Theft (DWA) System .33 Power Windows/Sunroof .42 Interior Lighting . 51 Visual Entry Aid.55 Seat/Mirror/Steering Column Memory . 58 Seat Functions.65 Steering Functions.66 General Functions .75 Consumer Cut Off/Overload Protection.75 Sleep Mode.76 Review Questions 79 CENTRAL BODY ELECTRONICS (ZKE III) Models: E38 - 740i(L) and 750iL E39 - 525i, 528i, 530i, 540i and M5 E53 - X5 3.0i and X5 4.4i Production Date: E38 1994 to Present E39 1997 to Present E53 1999 to Present Manufacturer: Hella Pin Connectors: White - 26 pin, Black 26 pin, Black 20 pin (large) Objectives of the Module After completing this module, you will be able to: • List the functions directly controlled by the GM III. • Describe how the GM III recognizes the key position from the drivers door. • Explain what “convenience” features are available from the FZV key. • Describe how the Seat Module communicates a request for a stored memory position with the mirror modules. • List what circuits are controlled by Consumer Cut Off. • Demonstrate how to Emergency disarm DWA. • Describe the changes in the 2000 MY Key. • Explain the electronic influence on power steering assist (Servotronic). • Demonstrate how to open the sunroof (in the event of an electrical malfunction). 2 Central Body Electronics ZKE III Central Body Electronics (ZKE III) Purpose of the System The Central Body Electronics (ZKE III) system manages the following functions: Driver’s Door Switch Block/ Module Power Windows Mirror Adjustment/Memory/ Heating GM III Windshield Wiping/Washing Windsheild Rain Sensor (AIC) Headlight Washing Tailgate Wiping/Washing Interior Lighting Central Locking Keyless Entry Key Memory Power Trunk Release Electric Opening of Tailgate DWA Alarm System Servotronics Consumer Cut-off/sleep mode Diagnosis Passenger’s Door Module Mirror Adjustment/Memory/ Heating Power Windows Sunroof Module Power Sunroof Seat/Mirror/ Steering Column Memory Module Seat Adjustment/Memory SteeringColumn Adjustment/ Memory The ZKE III system was introduced on the E38 and is used in the E39 and E53. Most of the functions operate the same on these vehicles with minor changes and added features to the system. ZKE III represents the combination of Body Electronics functions into one central control module, the General Module (GM). 3 Central Body Electronics ZKE III System Components General Module (GM): The GM is reponsible for the operation and central coordination of body electronics. The GM is a micro-computer that is the central component (heart) of the Central Body Electronics. The GM is located be¬ hind the glove box. The main objectives for using the GM are: • Increase Overall Reliability • Centralize Electronic Systems • Decrease Assembly and Service Repairs • Centralized Diagnosis of all ZKE Components • Individualization of Features (Coding) The GM requires input commands to perform Central Body Electronics functions. The inputs are supplied by digital switched signals such as: • Trunk Lock Microswitch - supplies voltage (KL 30) to the GM when switched. A path to gro¬ und is provided by the GM (internally). The GM monitors the switched input voltage. • Central Lock Button - supplies a ground cir¬ cuit to the GM when switched. The GM sup¬ plies and monitors a reference voltage (5v) that is “pulled” low when the switched gro¬ und path is provided. The GM processes the input information and contains “coded” instructions that allow a spe¬ cific output control of functions. The GM will produce output functions using internal transistors to switch current flow (pro¬ viding voltage or ground) through circuits and actuators. Actuators are the final controlling devices used by the GM to operate or control various output functions such as relays and motors. 4 Central Body Electronics ZKE III The ZKE III system offers an overall reduction in vehicle wiring particularly in the areas sub¬ ject to wear from movement such as doors, seats and the steering column. To accomplish this, the “P- Bus” is used to interface (signaling) with peripheral modules over a single wire. The ZKE III modular system consisting of the following components: General Module III = Main controller for ZKE functions PM - SB/FT PM - BT PM - SHD PM - SM AIC = Driver’s door switch block and door module = Passenger’s door module = Sunroof module = Seat/Mirror/Steering Column memory module = Rain Sensor (if equipped) All modules communicate through the P-Bus and GM III onto the K-Bus for diagnosis. FBZV RECEIVER MODULE t FBZV E)irnw®ir’® ©©©ir SwDtellulM®©^/ GM III MODULE LOCATED IN CARRIER FORWARD OF GLOVE BOX /" K w IP IPM-SInlO) E38 on K-Bus >99 MY 12520102.eps 5 Central Body Electronics ZKE III The following is an overview of new or changed features found on the E53 ZKE III variant: • Passenger’s door module is incorporated into the passenger’s door switchblock. • Sunroof module (SHD) is located on the P -Bus. • The Central Locking system uses a door lock actuators with hall effect sensors. • The GM III is responsible for the Key Memory feature. The E53 ZKE III system continues to be a modular system consisting of the following: General Module III = Main controller for ZKE functions PM - SB/FT PM - SB/BT PM - SHD PM - SM AIC = Driver’s door switch block and door module = Passenger’s door module/Window switch = Sunroof module = Seat/Mirror/ Steering Column memory module = Rain Sensor (if equipped) All of these modules communicate over the “K-Bus and P-Bus” for signaling purposes and diagnosis. FZV RECEIVER MODULE GM III MODULE LOCATED IN CARRIER FORWARD OF GLOVE BOX 'Jm [j* FBZV M III DWA m S) m D ( 5 L Mw®! 311 ® 0®@[r SwfelM®©k/ V IModuO® PMKFT/SB P®®®®^®^® P®@[f MoM® pim-bt StLOOTO®!? IM©(M® PM 6 Central Body Electronics ZKE III Power Distribution The power distribution box for the E38 is incorporated in the Electr¬ onics box in the engine compart¬ ment. The power distribution box for the E39 and E53 is inside the vehicle. The main fuse box is located inside the glove box above a hinged panel. A “pull out” fuse designation card is also located in the fusebox. This notes: • Fuse value in amps • Location • Circuit listing by fuse Equipment ABS ABS Air Airbag Anti-glare Automatic Auxiliary fan Brake light Central locking system Charging socket Courtesy mirror Diagnosis plug Driver seat adjustment Electric seat heating Engine control Fuel pump Garage door opener Fuse Equipment Fuse Equipment 17 30 Headlight cleaning system 30 31 Heated rear window 9 20 28 Heated steering wheel 4042 Heated washer jets 21 Heater )l 817 31 Heater blower 7 20 22 75 Horn 41 Immobilizer 6 27 29 Independent heater 39 Instrument duster 39 Light module 15 38 Multi-function steering wheel 44 13 21 Multi-information display 43 64 66 32 On-board monitor 25 44 1415 Outside mirror adjustment 6 29 31 17 Passenger compVtrunk lighting 4 21 Passenger seat adjustment 10 254344 45 20 Roller sun blind 34 Servotronic 9 Shifting gate illumination 24 38 20 23 Sliding/tilt roof 5 28 Speed control 41 3 38 Steering column adjustment 13 12 37 Telephone 43 44 23 Thermal sensor 21 18 24 40 Window lift 6 27 29 16 41 Windscreen washer system 4 2 er 1 26 Fuse Nr 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Ifi 17 18 19 20 Amperes 30 30 15 20 20 30 20 25 15 30 75 5 30 5 7,5 5 10 5 5 75 Fuse Nr 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 4(1 41 4? 43 44 45 Amperes 5 30 10 5 7.5 5 30 30 30 25 10 15 10 5 5 75 5 5 5 5 5 75 8371420 E.5769.H 12520103.eps The placement of the power distribution box is close to the main electronics carrier behind the glove box. The modules/relays located in the electronics carrier include (examples): • General Module III (GM III) • Drive away protection (EWS II) • Anti-lock Brake (ABS/ASC+T) • Light Check Module (LCM) - behind right kick panel • Overload protection relay module An auxiliary fuse block is located in the trunk above the battery. In addition to fuses, the auxiliary fuse block also contains relays (exam¬ ples): • Fuel filler flap lock motor relay • Fuel pump relay (some vehicles) • Rear defroster relay • Unloader relay 7 Central Body Electronics ZKE III Fused Power Distribution Centers The E38, E39 and E53 utilize high amperage fused power distribution centers. The E38 and E39 locations are found under the carpet on the passenger’s side floor and in the right rear area of the trunk, forward of the battery. REAR FUSED POWER FRONT FUSED POWER DISTRIBUTION CENTER DISTRIBUTION CENTER The X5 utilizes a single high amperage fused power distribution center located next to the left side EHC air reservoir beneath the cargo area floor paneling. 8 Central Body Electronics ZKE III Windshield Wiping/Washing Purpose of the System The windshield wiping/washing functions are controlled by the GM III when the ignition is in position KL R or KL15. The system has four wiping stages and four interval wiping speeds. The wiper motor output control is through two relays (double relay >98 MY, except E38) that are located in the Electonics box (E box). The Windshield Wiping System can also be supplemented with the Rain Sensor system as optional equipment. The Rain Sensor detects rain drops on the windshield and automati¬ cally activates the wipers when the stalk switch is in the intermittent position. System Components Wiper Stalk Switch lnput:The wiping stage inputs are coded signals through a two wire link with a combination of high/low inputs. The wiping stages include: Single (S): Momentarily holding the wiper switch down in the single position provides a momentary ground signal to activate a single sweep in slow speed. Slow (I) and Fast (II): The stage I and stage II wiping speeds are road speed dependent. Stage I switches to intermittent when the vehi¬ cle is stopped and stage II switches to stage I when stopped. 12510108.eps Windshield Washing: The wash request provides a switched ground input to the GM by pulling the stalk rearward. The GM activates the windshield washer pump directly. Intermittent (Int): The intermittent wiping time inputs are provided by a potentiometer mounted in the wiper stalk switch (1 through 4). The intermittent wiping intervals are also dependent on the road speed. As road speed increases, the wiping interval is shortened. WIPER TIME DELAYS (SECONDS) BASED ON SET POSITIONS 1 - 4 9 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs KLR KL 30 WIPER MOTOR Blocking Protection = Return Contact Signal must be present every 16 seconds or motor will be deactivated (LOCATED IN WASHER RESERVOIR FRONT RIGHT FENDER) 12510122.eps Headlight Washing (if equipped): When the headlights are on, the headlight washer pump is activated with the first activation of the windshield washer pump. It is only activat¬ ed again after five succesive windshield washer cycles during the same ignition key on cycle (rest function). The GM recognises headlights on via K-Bus signalling. The GM provides a ground on the headlight washer relay control circuit providing pump operation. The head¬ light washer pump is located on the side of the washer fluid reservoir. 10 Central Body Electronics ZKE III Rear Window Wiper/Washer System (E39 Sport Wagon and E53): The system is included in the scope of ZKE however is not controlled directly by the GM. The control elec¬ tronics are integrated into the rear wiper motor assembly. The control electronics contains two hall sensors, one for monitoring park position and other for the end stop, or to signal reverse direction of the wiper motor. The control electronics are connected to the vehicle electrical system via a single seven pin connector. The rear wiper system is operator controlled through the wiper stalk switch providing the fol¬ lowing functions: • Intermittent rear window wiping • Programmed rear window wiping interval • Operation of the rear window washer Pressing the wiper stalk forward to the first detent activates the rear wiper in the intermit¬ tentmode. The timed interval is approximately 7-12 seconds. The full sweep and park posi¬ tions are recognized by the two hall sensors on the motor gear assembly. If the wiper is switched OFF, the wiper blade will return to the park position. The programmed wiper interval procedure is as follows: • Briefly switch the rear wiper ON/OFF • Wait the desired interval time • Switch the rear wiper ON again • The OFF time will be the programmed interval - up to approx. 30 seconds Rear window washing is activated by pressing the wiper stalk switch to the full forward position. The washer pump operates followed by two full wiping cycles. The wipers will then switch to the intermittent wiping mode. Additionally, the system automatically controls the following safety and convenience features: • Wiper interrupt with the rear glass opened • Wiping interrupt with a blocked wiper arm • Continuous wiping when the vehicle is shifted into reverse When the transmission is shifted into reverse, the wiper will switch to continuous operation until the vehicle is shifted out of reverse. This signal (high) is provided by the LCM III when it activates the back up lights. 11 Central Body Electronics ZKE III Rain Sensor (AIC - if equipped) Purpose of the System The Windshield Wiping System is also available with an optionally equipped Rain Sensor. The Rain Sensor provides added driver convenience and enhances safety by automatical¬ ly activating the intermittent function of the windshield wipers when water droplets are detected on the windshield. System Components Rain Sensor: The unit is mounted on the top center area of the interior windshield surface directly behind the rear view mirror. The unit contains: • Optical Prism Body: This portion of the unit is per¬ manently fixed to the windshield. It can not be removed and can only be replaced with a replacement windshield. The prism body has a reflective surface that faces the back of the windshield. The prism body also acts as the windshield mount for the Rain Sensor Control Module. 12510112.jpg • Rain Sensor Control Module: The control module incorporates the following; - Infra Red Emitter and Detector Diodes - Optics heater (prevents condensation from forming on diodes and prism) - Optics evaluation and control electronics - Photo cell to detect night driving The control module requires four signals for operation; KLR, KL31, Windshield Wiper Motor Park Signal Feedback and K-Bus interface. 12510113.eps 12 Central Body Electronics ZKE III Principle of Operation The optical infra red portion of the sensor operates by the principle of refraction (bending of a light ray). The rain sensor control module activates the emitter diode which sends a beam of infra red light through the windshield on an angle. The set angle is important because it provides the beam with a calculated reflective path back to the detector diode. The beam is reflected back into the windshield due to the density difference of the glass compared with the ambient air on the outside surface of the glass. When the windshield is clean (no rain drops, moisture or dirt) the detector diode receives 100% of the infra red light that the was sent by the emitter. With this condition, the rain sensor evaluation electronics determines the windshield is free of rain drops. RAIN SENSOR PRISM OPTICS 12510114.eps The density of water is closer to that of glass than air. When rain starts to accumulate in the sensor monitoring area, it causes part of the infra red beam to extend past the outside surface of the glass and into the rain drop. When this occurs, the beam is refracted and only part of the beam returns to the detector diode. The rain sensor evaluation elec¬ tronics determines the windshield has a few rain drops (or dirt) on it. droplet of water glass windshield 12510115.eps The intensity of the returned infra red beam diminishes proportionally with an increase of water droplets. The rain sensor control module generates a signal proportionate to the amount of rain on the windshield and broadcasts it to the GM via the K bus. The GM activates the intermittent wipe cycle if the windshield wiper stalk switch is in the intermittent position. It also adjusts the frequency of wiping the windshield depending on the four position thumb wheel. 13 Central Body Electronics ZKE III Rain Sensor Function The rain sensor is online as soon as it receives KLR operating power. • When the windshield wiper stalk switch is placed in the intermittent position the GM sig¬ nals the rain sensor control module via the K-Bus of the request for intermittent wiping and the position of the knurled wheel (sensitivity). • As an acknowledgement, the rain sensor sends a command via the K Bus to activate the wiper motor. If more than 12 seconds pass before the GM receives the acknowledge¬ ment, the GM concludes the rain sensor has a defect and operates the intermittent wipe function as a system not equipped with a rain sensor. The wiper intermittent cycling is based solely on the knurled wheel setting. • The rain sensor continuously monitors the windshield for rain accumulation and signals the GM to activate the wipers based on the knurled wheel position and how fast the rain accumulates on the windshield. • The knurled wheel position signal (1 -4) via the K bus informs the rain sensor of the select¬ ed level of sensitivity. - Position 1 (least sensitive) delays the wiper activation signal. - Position 4 (most sensitive) sends the wiper activation signal to the GM sooner. • When the wiper motor park contacts signal the GM of the wiper arm position, the signal is simultaneously sent to the rain sensor as an indication that the windshield has been cleared of water drops and causes the rain sensor to reset the sensitivity delay timer back to 0. • If night time driving is detected via the integral photocell, the sensitivity to water droplets is increased causeing a shorter delay than day time driving. • Depending on the intensity of the rain the wipers will be operated continuously as if set in the normal wiper stalk switch position regardless of the knurled wheel setting. For this reason, the vehicle speed signal on the K bus is not utilized on rain sensor equipped wiper systems. 14 Central Body Electronics ZKE III • If the ignition switch is turned off with the wiper switch in the intermittent position, the rain sensor will only become active after the ignition is switched back on and one of the fol¬ lowing occurs: - The stalk switch is moved from the intermittent position and then back. - The knurled wheel setting is adjusted. - or the wash function is activated. The reasoning behind this switching strategy is to have the driver make a conscious deci¬ sion to activate the system themselves. Rain Sensor Control Module Adaptation The rain sensor control module adapts to the optics system environment as follows: Windshield Aging: As the vehicle ages the possibility of stone chipping in the rain sensors monitoring area may occur which will cause a loss of light in the optics system. The control module adapts for loss of light based on the intensity of the detected infra red light with a cleared windshield (wiper motor park signal). Therefore, the rain sensors func¬ tion is not adversely affected due to windshield aging. Dirty Windows: The rain sensor adaptation reacts less sensitively to a dirty windshield (dirt, road salt, wax residue) after a completed wipe cycle. A dirty windshield has a film on it that diminishes the ability of the infra red to refract into present water droplets. This caus¬ es a delay in the rain sensor detection capabilities which lengthens the time intervals on an intermittent wipe. Windshield Wiper System Failsafe Operation The GM provides failsafe operation of the wiper system if faults are detected with any of the following input signals: Function Faulted Input Detected Failsafe Function Intermittent Wipe Short or open circuit of the knurled wheel signal Delay value for setting 3 used. Intermittent wipe with Rain Sensor Faulted Rain Sensor or K-Bus Signal corrupt Normal Intermittent wipe implemented Wiper Motor not Functional Moving Park contact feedback signal takes longer than 16 seconds Wiper motor control deactivated for 3 minutes 15 Central Body Electronics ZKE III Workshop Hints Windshield Wiper Blade Service To access the wiper blades for cleaning or replacement,the following is required: • With the ignition switched on (KL15), switch the wiper stalk to the “Intermittant” wipe mode. • Switch the ignition off when the wiper arms are in the “upright” position. CAUTION: Do not allow the wiper arm to spring back against the windshield, glass breakage will occur! Rain Sensor Equipped Vehicles Make sure the wiper blades are in perfect condition. Only use window cleaner to clean the windows. Dirty windows can cause the Rain Sensor controi moduie to set a fault due to the end limits of its adaptation abilities. Rear Window/Wiper The wiper arm and driveshaft are connected by splines. Special tool #61 1 320 is required to hold the drive shaft in the park position prior to installing the wiper arm on to the drive shaft. Windshield Wiper System Diagnosis The GM monitors the following circuits: WIPER ARM DRIVE SHAFT CONTROL MODULE GEAR DRIVE MOTOR 12510117.jpg □ RIVE WHEEL PER EASE HOUSING [SPRING LOADED □RIVE PIN IvdrlwwhfleMO' flipjiii rf-ni i!rivu illu^- WIPER ARM SPRING WIPER ARM NUT • Wiper Potentiometer • Wiper Motor • Terminal 30 • Double Relay • Windshield Washer Pump Note: The wiper/washer operation will be interrupted during engine cranking. The GM pro¬ vides this “unload” feature to preserve the battery voltage for the starter motor. 16 Central Body Electronics ZKE III Central Locking Purpose of the System The Central Locking System provides locking/ unlocking of the entire vehicle from one central exterior point. From the driver’s door or the remote (key-less) entry, a lock/unlock request will lock/unlock all exterior doors, luggage compart¬ ment and the fuel filler flap. 12510117.jpg From inside, the vehicle can be locked/ unlocked using a cen¬ tral locking button located in the center console. Individual doors can be unlocked manually by pulling twice on the inte¬ rior door handle. From 2000 MY - if the vehicle has been double locked, press the central locking button and pull the interior door handle twice (alarm will sound when the door opens). Locking the vehicle from the central switch will “single lock” all doors, luggage compartment and not lock the fuel filler flap. The Central Locking System utilizes the GM III and Door Modules to carry out all of the lock¬ ing/unlocking features: • Remote (key-less) entry is standard. • When locked from the outside, the vehicle will double lock and arm the DWA System. The ignition must be switched off and the driver’s door must be opened and closed. • Selective unlocking from the outside of the vehicle. Unlocking from the driver’s door or remote transmitter will only unlock the driver’s door and disarm the DWA System. A sec¬ ond request will unlock the remaining doors and luggage compartment. This feature can be modified for individual users in Key Memory to open all doors from a single request. • A single central locking button is installed in the center console that will operate when all of the doors are closed. Locking the vehicle from the central switch will “single lock” all doors, luggage compartment and not lock the fuel filler flap. When unlocking, a single request will unlock the driver’s door only. This feature can be modified for individual users in Key Memory to open all doors and luggage compartment from a single request. 17 Central Body Electronics ZKE III • A remote luggage compartment button is installed in the left kick panel (center console in the E53) to open the luggage compartment from inside the vehicle. • The EWS is interfaced for double lock monitoring and unlock function. With the presence of an accepted EWS key in the ignition, the vehicle will be unlocked and disarm DWA. • The automatic locking feature (> 99 MY) activates the door locks when a road speed signal of 5 MPH and engine RPM is detected via the K-Bus. The factory default setting of this feature is off (can be encoded on for individual users with Key Memory function). WHEN CORRECT KEY IS INSERTED INTO THE LOCK THE TUMBLER ENGAGES WITH THE OUTER BARREL ALLOWING PROPER LOCK OPERATION. Door Button Lock • In the event of an accident (ignition on), the GM will be signalled to unlock all doors. V Hardware Features: The external lock cylinders are located in the driver’s door and luggage compartment lid (E53/E39 Sport Wagon does not have a tail¬ gate lock cylinder). The driver’s door and luggage compartment incorporates an overrunning lock cylinder. The lock cylinder will free wheel or spin If any key other than the vehicle key or tool, such as a screw driver, is inserted into the cylinder. The lock cylinders can be manually locked/un¬ locked by turning the key “past” lock/unlock. The door lock buttons are mechanically uncoupled from the lock actuators when locked. The door lock buttons “mechanically” lock the individual doors. This provides manual locking in the event of a central locking malfunction. Child safety locks (located in the rear doors) are actuated by inserting a key in the slot on the door latch or by sliding a lever (dependent on model). The door can now only be opened from outside. CP Q. CD CD O C\J LO CM CP Q. CD rC o CM LO CM 1£510121.eps 12520120.eps 18 Central Body Electronics ZKE III • The luggage compartment can be manually locked with a “Master Key” and leaving the lock cylinder in the horizontal position which prevents opening by any other method (sec¬ ured for valet). The luggage compartment release button in¬ side the vehicle will also be ignored by the GM. Prior to 2000 MY the vehicle could be locked/ unlocked using the luggage compartment lock cylinder. 12520120.jpg • The glove box has a lock cylinder to secure the contents by manual locking with a “Master Key” and leaving the lock cylinder in the hori¬ zontal position which prevents opening by any other method (secured for valet). • The E38 has a lever behind the glove box han die which permits locking the glove box with¬ out a key. Opening still requires a key. 12520121 .jpg The valet key is not mechanically capable of entering either of these lock cylinders. • The Fuel Filler Flap mechanical release is found in the right side of the luggage compartment. The “pull tether” is behind the button as shown on the right. 51500002.tiff Note: Continuous operation of locking/unlocking will cause a timed arrest of the locking system. When activated, the timed arrest lasts for 2 minutes (or recycle the ignition KL15). The “crash” signal will override the timed arrest and unlock the vehicle. 19 Central Body Electronics ZKE III System Components - with the Principle of Operation Driver’s Door Lock: The lock/unlock signals from the driver’s door lock cylinder are input to the driver’s door module from the two micro switches on the lock cylinder. The driver’s door switchblock module carries out the locking func¬ tion of the driver’s door. - UNLOCK "" — - DWA DISARMED - CONVENIENCE OPENING (HOLD UNTIL —-V ACTIVATED) /\ ^ MANUAL UNLOCK' LOCK DWA ARMED CONVENIENCE CLOSING (HOLD UNTIL ACTIVATED) MANUAL LOCK The windows and sunroof can be closed or opened by holding the key in the lock/unlock 12520123 eps position (convenience closing/opening feature). The signal to lock the remaining doors and fuel filler flap is passed over the P-Bus to the GM III and passenger’s door module. The locking of the passenger’s door is carried out by the passengers door module. The rear doors, luggage comparment and fuel flap locking are carried out directly by the GM III. All four doors will be pulled into the double lock posi¬ tion when locking from the driver’s door. The control of the actuators in the front doors is through final stages in the door modules. The rear doors, trunk and fuel filler flap actuators are controlled by internal relays in the GM III. When locked, the GM III will not carry out any opening commands from the central lock¬ ing button or luggage comparment interior release button. Luggage Compartment Lock Cylinder (except E53/E39 Sport Wagon): The vehicle can be locked/ unlocked (prior to 2000 MY) from the luggage compartment lock cylinder. The lock/unlock micro switch inputs are processed in the GM III and the locking commands are carried out. The signal is passed over the P-Bus to the door modules to lock/unlock the front doors and the GM III locks the rear doors and fuel filler flap. UNLOCK DWA DISARMED - LOCK - DWA ARMED All door actuators are placed in the double lock position. Removing the key in the hor¬ izontal position will activate the valet mode and prevent the valet key from opening the luggage comparment. MANUAL UNLOCK VALET LOCK POSITION 12520124.eps 20 Central Body Electronics ZKE III Luggage Comparment Remote Unlock: The luggage com- parment can be opened from inside the vehicle with the remote release button. This feature is also functions when the doors are locked from the central button. The GM will disregard the remote release button input when the luggage comparment is mechanically locked with the Master Key (valet setting). The GM will also disregard the release input if the vehicle speed is > 4 MPH. The E53 remote release button is located in the center con¬ sole. This input will release the rear liftgate following the same criteria stated above. Crash Signalling 12520124.eps The Multiple Restraint System (MRS) control module provides a switched signal to the GM in the event of an accident. This signal was previously provided by the crash sensor locat¬ ed in the left front kick panel (< 9/96 MY). The signal is an output function of the MRS control module and becomes active when MRS determines a crash has occurred. The GM unlocks the vehicle, switches on the interior lights and flashes the exterior lights when this signal is active. KLR 2 -C- KLR 2 <- ELECTRONIC ACCELERATION SENSOR _ SIGNAL GENERATOR <9 ELECTRONIC ACCELERATION SENSOR SIGNAL GENERATOR DRIVER'S SIDE IMPACT SENSOR ■> <- PASSENGER'S SIDE IMPACT SENSOR <- oc o o < CD CO ELECTRONIC ACCELERATION SENSOR _1 i TRIGGER LOGIC _5 i COMPONENT ACTIVATION MRS CONTROL MODULE TO PYROTECHNIC DEVICES 12520125.eps 21 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs KL 30 KL 30 22 Central Body Electronics ZKE III Door Lock Actuators: A door lock actuator contains an electric motor and an integrated microswitch (position switch). The rotary motor movement through the gear drive mechan¬ ically moves the locking latch. When the lock actuator is operating, the motor is powered until the position switch signals the “locked” position. If the vehicle is locked from the exterior, the motor is powered further and the the gear mechanism is moved beyond the locked position into the “double lock” position. The motors must be powered (in reverse) to release the double lock. The inside door handles will not unlock a “double locked” vehicle. • Door lock key position (driver’s door only) • Door open/closed status (replaces door jamb switch). The GM monitors the lock cylinder positions over two wires. The signals are generated by two hall effect sensors (Hall Sensor 1 & 2) located in the actuator. When the key is turned, a plastic cylinder in the lock actuator is simultaneously rotated by the lock tumbler extension rod. E53 Door Lock Mechanism: The E53 utilizes a door latch combined with dual actuator motors. This type of actuator is sealed, self contained units with no replaceable parts. The door lock actuators use hall effect sensors in place of pin contacts/microswitches to pro- An asymmetrical shaped magnet is incorporated in the plastic cylinder, which when rotat¬ ed changes the magnetic influence on the hall sensors. The presence of a magnet in close proximity to the sensing surface of either hall sensor creates a coded input over the two wires that the GM uses to determine the key position. • Magnet in front of sensor, current flow through the sensor is <5 mA (0). • Magnet rotated away from sensor, current flow through the sensor is >12 mA (1). Hall effect sensors improve the actuators reliability since they are impervious to moisture and there are no wear contacts. 23 Central Body Electronics ZKE III • Key in the neutral position, both sensors are simultaneously influenced by the magnet - 0 / 0 . • Key turned to the unlock position from neu¬ tral, hall sensor #1 magnet segment moves away from hall sensor -1/0. • Key turned to lock position from neutral, hall sensor #2 magnet segment moves away form hall sensor - 0 / 1 . I PLASTIC CYLINDER WITH ASYMMETRICAL MAGNET (Shown in the Lock Position) HALL SENSOR 1 There are two motors incorporated in each actuator that provide two separate functions: Single lock/unlock function: Also known as central lock, this motor controls the mechanical lock mecha¬ nism when the central lock button is pressed to single lock the vehicle. The lock mechanism is fully locked at this point but can still be opened from the interior by pulling the appropr¬ iate interior door handle twice or by pressing the cen¬ tral lock button again. When single lock function is acti¬ vated, the fuel filler flap actuator is not locked. Double lock/unlock function: Also known as central arrest, this motor is activated only when the vehicle is locked from the exterior at the driver’s door lock with a key or when the GM receives a lock request from the Key-less entry system. In this case the double lock motor is activated simultaneously with the single lock motor. The function of the double lock motor is to mechani¬ cally offset an internal rod disabling it from unlocking the vehicle from the interior. This prevents the doors from being unlocked by any means except from an unlock request at the driver’s door or via the Key-less entry. WHEN IN DOUBLE LOCK AN INTERIOR ACTUATED UNLOCK ROD IS OFFSET PREVENTING THE LOCK MECHANISM FROM BEING MECHANICALLY UNLOCKED 24 Central Body Electronics ZKE III Door Contact Hall Sensor: Also included in the drivers door actuator is a third hall effect sensor. This sensor signals the door open/closed status to the GM. This sensor replaces the door jamb mechanical switch of previous systems. The rotary latch plate position acti¬ vates the door contact hall sensor. • When the door latch is closed, current flow through the sensor is <5 mA (0). • When the door is open, current flow through the sensor is >12 mA (1). The passenger side front door and both rear door lock actuators only include this hall effect sensor (hall sensor 3). Hall sensors 1 & 2 are not required. DRIVER'S DOOR LOCK ACTUATOR HALL ©i SENSOR 1 HALL o—c SENSOR 2 I- SINGLE (M)LOCK 'w 7 MOTOR DOUBLE (M)LOCK 'w' MOTOR HALL LEFT REAR DOOR LOCK ACTUATOR O—C -X SENSOR 3 LATCH PLATE o—c KL 30- 12520131 .eps Trunk Lid Close (E38 SCA)/Tailgate and Window Latching System (E39/E53): The tailgate/trunk lid is opened by any of the three input signals: FZV, remote button and unlock switch pad (push - trunk lock cylinder E38). These inputs request the rear latch actuator control circuit to be switched to ground (exception: presence of road speed signal, key on with FZV request.) The rear latch actuator unlatches the mechanism and signals the GM of the open latch status. The SCA motor rotates the striker 180°. Feed-back signalling stops the motor. E38 - When closing the trunk lid the trunk latch micro¬ switch signals the GM to activate the SCA motor to pull the lid down. j— X253 TAILGATE 10 REAR WINDOW SWITCH GM II w H cc * o O _l z D REAR LATCH K70 ACTUATOR RELAY SCA ON/OFF REQUESTS SCA POSITION FEEDBACK REAR WINDOW ACTUATOR RELAY + + E39 Sport Wagon Shown LATCH MECH. REAR LATCH - ACTUATOR X254 SCA MOTOR REAR WINDOW ACTUATOR 615200097.eps Rear window unlatching is requested by the rear window switch ground signal. This signal initiates activation of the rear window actuator relay control circuit which activates the rear window actuator. The actuator unlatches the mechanism opening the window. The latch simultaneously provides an open window signal for the rear window wiper motor module as well as an interior light on request (via the wiper module). 25 Central Body Electronics ZKE III Remote (Keyless) Entry FZV Purpose of the System The Remote Entry System offers the following: • Locking/unlocking of doors, luggage compartment (tailgate), fuel filler lid. • Selective unlocking of driver’s door (same as with key in the lock cylinder). • Arming/disarming of DWA alarm system. • Remote unlocking of the trunk (tailgate) only. • Comfort opening of windows and sunroof. • Interior lighting activation (search mode). • Panic mode alarm activation. • Changing code signals - coded signals from transmitter change with every operation. • Automatic correction for up to 1000 erroneous activation signals. • Transmitter initialization procedure - including up to four key operation and Key Memory. • Replacement batteries. • Low transmitter battery in vehicles equipped with Check Control. KL 30- KL 31 - REMOTE LOCK/ UNLOCK RECEIVER MODULE (IN "C" PILLAR) LOCK ACTUATOR (/) D CO ■ Q. I= n _ DRIVER'S DOOR SWITCHBLOCK MODULE (PM-FT/SB) Xm> FUEL FILLER FLAP RELAY K BUS PASSENGER'S DOOR MODULE (PM-BT) WINDOW MOTOR LOCK ACTUATOR WINDOW MOTOR SUNROOF MODULE (PM-SHD) SUNROOF MOTOR INTERIOR LIGHTS REAR DOOR LOCK ACTUATORS REAR DOOR POWER WINDOW MOTORS TRUNK LID ACTUATOR FUEL FILLER FLAP ACTUATOR DWA ALARM SIREN TO LCM FOR ACTIVATED ALARM LIGHTS FLASHING 61 5200098.eps 26 Central Body Electronics ZKE III The Remote Entry System incorporated minor changes since the original introduction which includes: • The control electronics are incorporated into the GM III. • The antenna is incorporated into the rear window lower heater grid. • The remote key receiver is installed in the left “C” pillar. The receiver produces a digital signal based on the transmitter command and sends it to the GM for processing. The GM then carries out all remote entry operations either directly or through the door modules for the front doors. The frequency at which the key transmits the radio signal to the ant¬ enna amplifier is 315 MHz. 615200099.eps Adjust Setting of Seat For Key #1 Vehicle/Key Memory The Vehicle/Key Memory feature provides the flexibility of allowing the owner to customize certain functions of select vehicle systems and automatically identifies users of the vehicle by a key identification signal provided by the remote keyless entry system (FZV). Vehicle & Key memory is marketed as a combined feature but is actually two separate func¬ tions of the select vehicle control systems. 27 Central Body Electronics ZKE III Vehicle Memory: The owner is provided with a list of available system functions that can be customized to their liking. Prior to delivery, the DISplus or MoDiC is used to encode the owner’s chosen selections into the appropriate control modules. These choices become a permanent function of the control module and can only be changed by re-encoding with the DISplus or MoDiC at a BMW Center. This feature has been available for some time via the ZCS Conversion Feature but has never been fully utilized or officially presented to the vehicle owner as a feature of their vehi¬ cle. Key Memory: This feature provides the added convenience of identifying users of the vehi¬ cle whenever a lock or unlocked signal is generated via the individual FZV keys. A maxi¬ mum of four FZV keys can be used with the Key Memory feature. Each of the four keys generate a unique key identification signal (key number) that is trans¬ mitted simultaneously with the lock/unlock signals to the General Module. Key Memory does not respond to Lock/Unlock requests from the drivers door lock. Most of the key memory functions require the vehicle be configured using the “KEY MEM¬ ORY” function of the DIS or MoDiC. However, there are a few features that store settings automatically without configuration such as IHKA blower speed and temp setting. The key ID signal alerts the GM to communicate with select control systems over the K Bus to store (when locked) or reset (when unlocked) certain driver adjustable settings. There are features that function as both a Car & Key Memory feature. Example; the Automatic Seat Adjustment feature is encoded as a Car Memory Function with the following possibilities: • When unlocking, • When opening a door after unlocking • Or not active at all. If active, the seat positions are stored and reactivated by the Key Memory function for indi¬ vidual users of the car. Notes: 28 Central Body Electronics ZKE III System Components Remote Key: BUTTON #1 PRESS ONCE = • LOCKING, • DWA ARMING (if equipped), • INTERIOR LIGHTS ON WHEN VEHICLE LOCKED PRESS TWICE WITHIN 10 SECONDS = • DEACTIVATE UIS & TILT MONITORING BUTTON #2 PRESS ONCE: • UNLOCK DRIVER'S DOOR • DWA DISARMED (if equipped) • INTERIOR LIGHTS ON PRESS TWICE: • TOTAL UNLOCKING HOLD: • CONVENIENCE OPENING BUTTON #3 615200100.eps MOMENTARILY PRESS: PRESS AND HOLD: • TRUNK LID OPENS • PANIC MODE (ALARM- If equipped) Features: • 3 volt lithium battery (commercially available CR 2016) is used as the power supply for the key transmitters. • An EEPROM is used to store the key data. The data is not lost when the battery is re¬ placed and initialization is not required. The key incorporates an LED that signals the opera¬ tor of signal transmitting, key initialization status and key self test indication. Green t Ke y 2 Hod - Key 1 Blue - Kty 4- • The keys are delivered with a four color label sheet containing differ¬ ent colored labels for each of the four pos¬ sible FZV keys. This is helpful to differenti¬ ate the FZV keys during initialization preventing the pos sibility of mis-assigning the key ID which would change the encoded Key Memory functions. 615200049.eps / Model Year 2000 Key Visual Changes: • New appearance with blue and white BMW roundel. • New button arrangement (larger buttons) with seq¬ uential operation (enhanced operating convenience). Functions the same as the previous key. • Rechargeable battery replaces replaceable batteries. Charged by EWS ring antenna. • The key housing is encapsulated and can not be opened. • The LED has been omitted. 29 Central Body Electronics ZKE III Workshop Hints Remote Key Initialization: The initialization of the FZV keys is required to establish the Lock/Unlock signal synchronization with the GM. The initialization procedure provides the GM with a key identification number and a “rolling code” for each key. If the initialization is not performed, the GM will not respond to the key signals. Up to 4 remote keys can be initialized. They must be initialized at the same time. Key ini¬ tialization is only possible with the vehicle unlocked. Procedure: 1. Close all doors and have all keys available. 2. Using key number 1, turn the ignition switch to KL R, then switch off within 5 seconds and remove the first key. 3. Within 30 seconds of turning the ignition switch to “off” Press and hold button #2. 4. While holding button #2, press and release {“tap”) button #1 three times within 10 seconds. 5. Release both buttons. The LED in the key will flash momentarily (except 2000 MY). The GM will imme¬ diately lock and unlock the doors signaling a suc¬ cessful initialization. 6. If additional keys need to be initialized repeat steps 3 - 5 within 30 seconds. 7. Switching the ignition to KL R completes the initiali¬ zation. NOTE: The key memory function of the GM responds to the key identification number of each key. If the keys are not initialized in the same order prior to initialization, the key memory functions activated by the keys will not be assigned correctly. Always initialize the keys in the same order. 30 Central Body Electronics ZKE III LED Status (Keys equipped with LED): The following functions can be checked with the LED: • Flashing LED when pressing a button. Indicates that the data is being transmitted, (battery voltage between 3.2 - 2.6 volts) • No LED activity when pressing a button: 1. ZKE responds to pressed button only to unlock a locked vehicle. Indicates the bat¬ tery is between 2.6 - 2.2 volts. Replace bat¬ tery. 2. No unlock of vehicle. Indicates battery is below 2.2 volts. Replace battery. FZV Key Test: Pressing the trunk release and lock buttons together activates the key test. If the battery and FZV key EEPROM are “OK”, the LED will come ON for approximately 1 sec¬ ond. FZV Key Rechargeable Battery From KL R, the battery inside the key head is charged inductively by the EWS ring antenna via a coil antenna integrated in the key. The charging process is controlled by electronic circuitry integrated in the key. • The service life of a radio-control key used under normal conditions corresponds to the veh¬ icle lifespan. • If the FZV keys are not used (ie: stored in a drawer), the battery will be discharged after approx. 1.5 years. • The time required to fully charge a discharged battery is approx. 30 hours. • The remote control can be operated about 15 times after a charging period of approx. 30 minutes (driving time). 31 Central Body Electronics ZKE III The key data is stored in a transponder chip. The transponder chip is a wireless read and write EEPROM. It is powered via the ring coil at the steering lock. Power is applied elec- tromagnetically when the key is in the ignition switch from KL R. The power supply is used both for data transfer as well as for charging the battery. This has been made possible by new development of the transponder chip. As with previous systems, every press of an FZV key also provides the battery charge con¬ dition. When the FZV electronics receives a low power condition message three successive times, the GM sets a fault indicating a low battery within a specific key. The LCM is also informed via the bus system and alerts the driver via an instrument cluster matrix message. If the battery is recharged (used operate car), the fault will be automatically deleted when five successive messages are received indicating a charged battery condition. The battery has no affect on the EWS III communication function! 32 Central Body Electronics ZKE III Anti-Theft (DWA) System Purpose of the System The DWA alarm system offers vehicle protection by monitoring the doors, hood, interior, luggage compartment and vehicle tilting. When activated, DWA deters theft by sounding an alarm siren for 30 seconds, flashing the low beam headlights (high beam on Xenon equipped models) and four way flashers for 5 minutes. The control electronics for DWA are integrated in the general module. The DWA - LED indicator is located in the rear view mirror (E38 in the top center IHKA grille). The system is “armed/disarmed” from the driver’s door lock cylinder, remote transmitter or luggage compartment lock cylinder. The alarm is immediately deactivated when disarmed with the key in the driver’s door lock cylinder (may be deactivated in Conversion) or remote transmitter. The GM utilizes existing components and/or circuits as part of the DWA system: • Door latch switch/sensor contacts (door open/closed). • Trunk lid switch contact (monitored for closed trunk). • Trunk lock key position switch (located on the trunk lock, this switch signal prevents DWA from activating if armed when the trunk is opened with the key). • Hood switch (monitored for closed hood, located under the hood). • DWA status LED (part of rear view mirror). The additional components required are: • Interior Sensor • DWA Siren • Tilt sensor 33 Central Body Electronics ZKE III System Components Interior Sensor FIS (up to 99 MY): The interior sensor is mounted in the center of the headliner panel. Due to the design of the vehicles interior, the sensor is uni-directional and must be installed in the proper direction to ensure proper operation of the system. SENSOR IN HEADLINER PHYSICAL CHARACTERISTICS OF SENSOR When the alarm system is armed, the sensor emits electromagnetic waves at a frequency of 2.45 GHz. As long as nothing is moving in the vehicle, the waves as bounced back to the sensor at the same frequency. The sensor monitors these bounced back waves as an indication that nothing is disturbed within the vehicle. If a foreign object enters the vehicle, the frequency of the bounced back signal changes. The sensor monitors the changed frequency and triggers the alarm. Every time the DWA system is armed, the sensor adapts to what ever objects might be stationary in the interior. This allows packages or objects to be left inside the car without effecting the operation of the system. The sensitivity of the sensor is set so that the moving object must be at least as large as a bumble bee. This prevents a false alarm from occurring from small insects that might be caught in the vehicle. FIS SENSOR 615200103.eps The FIS is switched OFF when the vehicle is locked two times within ten seconds. The LED will flash one time for confirmation. This allows the sensor to be switched OFF to avoid false alarms when the windows are left open for venting. 34 Central Body Electronics ZKE III Interior Sensor UIS (after 99 MY): Similar to the FIS, the UIS monitors the vehicle interi¬ or for motion. The UIS uses ultrasonic sound wavs instead of microwaves (less suceptable to magnetic interference). The UIS is a combined transmitter and receiver. The interior sensor is mounted in the center of the headliner panel. Due to the design of the vehicles interior, the sensor is uni-directional and must be installed in the proper direction to ensure proper operation of the system (trim cover ensures directional installation). SENSOR IN HEADLINER PHYSICAL CHARACTERISTICS OF SENSOR Every time the DWA system is armed (signal STDWA), the sensor adapts to what ever objects might be stationary in the interior. The sensor emits ultra sonic waves in a pro¬ grammed timed cycle. It receives echos of the emitted waves. The UIS amplifies the received sound wave signals and compares them with the transmit¬ ted waves. The UIS also checks the incoming echos for background hiss (wind noise through a partially open window) and adapts for this. • If the echos are consistently similar, no movement is detected. • If the echos are altered, (inconsistent), the UIS determines motion in the interior com¬ partment. If motion is detected, the UIS changes to a constant cycle and the echo is compared again. If the inconsistency is still present the UIS sends the activate siren signal (INRS) to the GM. The UIS is switched OFF when the vehicle is locked two times within ten seconds. The LED will flash one time for confirmation. This allows the sensor to be switched OFF to avoid false alarms when the windows are left open for venting. 35 Central Body Electronics ZKE III Tilt Sensor (Liquid Type - E38/E39 to 97 MY): The Tilt Sensor consists of a conductive liquid chamber, a processor board and metal probes (located in the luggage compartment). The probes are submersed in the liquid and produce a resistance value dependent on the tilt of the sensor (angle of vehicle). This resistance value becomes the static point when the DWA System is armed. If the vehicle is jacked-up or lifted, the angle of the liquid changes producing a change in the resis¬ tance value. The sensor recog¬ nizes this change and signals the GM to activate the DWA alarm. The resets at the new angle. This allows the DWA to remain armed and re-activate the alarm if vehicle is moved again. 1. DWA ARMED, TILT SENSOR REGISTERS the RESISTANCE VALUE THROUGH FLUID. SIGNAL HIGH TO GENERAL MODULE 2. VEHICLE TILTED, FLUID MOVES AND CHANGES RESISTANCE VALUE BETWEEN PLATES. HIGH SIGNAL MOMENTARILY GOES LOW SIGNALLING GM TO ACTIVATE THE ALARM. 625200107.eps As with the interior sensor, the tilt sensor is also switched OFF when the vehicle is locked two times within ten seconds. The LED will flash one time for confirmation. This allows the sensor to be switched OFF for transportation purposes. Tilt Sensor (Electronic Type from 98 MY): Located in the luggage comparment area, the tilt sensor is an electronic sensing device with the sole purpose of monitoring the vehi¬ cle's parked angle when DWA is armed. The sensor requires three signal wires to func¬ tion: • KL 30 - Constant battery voltage • Signal "STDWA"; switched ground input sig¬ nal provided by the GM indicating DWA armed/disarmed status. The tilt sensor is used as a splice location for the STDWA signal to the Siren and UIS int¬ erior protection sensor. 36 Central Body Electronics ZKE III • Signal "NG"; switched ground output signal provided to the GM. The signal is used for two purposes, 1. As a momentary acknowledgment that the tilt sensor received STDWA and is cur¬ rently monitoring the vehicle angle. 2. If the tilt sensor detects a change in the vehicle's angle when DWA is armed, signal NG is switched to inform the GM to activate the siren. When the tilt sensor receives the STDWA signal from the GM it memorizes the vehicle's parked angle. The angle of the vehicle is monitored by the solid state electronics. Once armed, if the angle changes, the tilt sensor provides a switched ground signal to the GM to activate DWA. As with the interior sensor, the tilt sensor is also switched OFF when the vehicle is locked two times within ten seconds. The LED will flash one time for confirmation. This allows the sensor to be switched OFF for transportation purposes. Glass Breakage Sensors (Early E38 - before FIS Sensor): The door windows (includ¬ ing the rear quarter glass wire loop) are monitored by inductive sensors mounted on the inside of the door behind the trim panel. A closed window is recognized by a magnetic plate on the glass lining up with the sensor. If the glass is broken, the plate falls away and the signal from the sensor changes and the GM will activate the alarm. Alarm Siren: The alarm siren is mounted in the rear wheel well, behind the inner wheel housing cover (early E38 used an alarm horn). The E53 alarm siren is located in the left side of the engine compartment. The siren contains electronic circuitry for producing the warn¬ ing tone when the alarm is triggered. The siren also contains a rechargeable battery that is used to power the siren when the alarm is triggered. The rechargeable battery will allow the siren to sound if it or the vehicle’s battery is disconnected. The siren battery is recharged, from the vehicle’s battery, when the alarm is not in the armed state. CONNECTOR 625200108.eps 37 Central Body Electronics ZKE III The siren has four wires connecting it to the system; KL 30, KL 31, activate siren signal (SIRENE) and the arm/disarm signal (STDWA). The arm/disarm output signal from the GM is provided to the Tilt sensor, FIS/UIS sensor and the siren. The arm/disarm signal is a switched ground that signals the components of an armed/disarmed status. 97 MY E38 Shown ARM / DISARM SIGNAL The activate siren signal to the siren is high whether DWA is armed or disarmed. If a mon¬ itored input activates the alarm, the high signal to the siren is switched to a 50% duty cycle at the GM. The control circuitry in the siren activates the siren driver. If the DWA is armed and the battery is disconnected the siren recognizes the normally high “SIRENE” signal as suddenly going low, the siren is activated. Notes: 38 Central Body Electronics ZKE III TILT SENSOR System Components: Inputs - Processing - Outputs KL 30 DRIVER'S DOOR DOOR LOCK A MICROSWITCH KL R HOOD SWITCH DRIVER'S DOOR JAMB SWITCH PASSENGER'S DOOR JAMB SWITCH ARM/ DISARM RIGHT REAR DOOR JAMB SWITCH ACTIVATE ALARM KL 30 (§©] — C-| u ^J TRUNK LOCK MICROSWITCH TRUNK LID SWITCH — c- TRUNK LID 97 MY E39 Shown P-BUS ->- 3 - 0 - KL 30 x l-BUS (540i) o LO ->■—-O K-BUS KL 31 DWAH 0 KL 30 DWA SIREN TO TILT AND FIS SENSORS KL 31 KL 30 DWA LED KL 31 39 Central Body Electronics ZKE III Principle of Operation DWA Arming/Disarming • The DWA is armed every time the vehicle is locked from the outside with the door lock cylinder or FZV key. • The DWA LED flashes as an acknowledgment along with the exterior lights and a momentary chirp from the siren. • The GM monitors all required input signals for closed status (door closed, luggage com¬ partment closed, etc.) The inputs must be in a closed status for a minimum of 3 sec¬ onds for the GM to include them as an activation component. If after 3 seconds any input signal not in the closed status is excluded (this is acknowledged by the DWA LED) preventing false alarm activations. The hood switch can be “lifted” to the service posi¬ tion to test the alarm with the hood open. • If the DWA is armed a second time within 10 seconds, the tilt sensor and interior pro¬ tection sensor are excluded as alarm activation components. This function is useful if the vehicle is transported on a train or flat bed truck to prevent false alarm activations. • While armed, the trunk can be opened with out the alarm being triggered as follows: - If opened with the trunk remote button via the FZV, the GM prevents the alarm from activating. (This feature is customizable under the Car Memory function). - If opened with the key at the trunk lock cylinder the trunk key position switch sig¬ nals the GM and in the same manner prevents the alarm from activating. In either case, when the trunk is returned to the closed position, it is no longer con¬ sidered as an activation signal. Panic Mode Operation: When the trunk button is pressed and held, the GM is signaled to activate the siren for the Panic Mode. The panic mode is function with either an armed or disarmed DWA system. Emergency Disarming: Emergency disarming occurs automatically if a key is used to turn the ignition switch on and the EWS accepts it. The EWS signals the GM to unlock the doors and deactivate the DWA. 40 Central Body Electronics ZKE III Alarm Indication When the alarm is triggered, the siren will sound for 30 seconds. At the same time the low beam headlights (high beams on Xenon equipped vehicles) and four way flashers for 5 min¬ utes. The GM signals the LCM via the bus system to flash the lights. Following an alarm activation, the system will reset and activate again if further tampering occurs. DWA LED Status: DWA STATUS DWA LED CONDITION Disarmed OFF Armed Continual slow flash Armed with one or more monitored inputs not in closed position (ie: trunk not fully closed, etc) Rapid flash for 10 seconds, then continual slow flash. Alarm activated Rapid flash for 5 minutes, then continual slow flash. Rearmed in less then 10 seconds. ON for 1 second Disarmed after activated alarm Rapid flash for 10 seconds, then OFF. Notes: 41 Central Body Electronics ZKE III Power Windows/Sunroof Purpose of the System The features of the power windows and sunroof system include: • One-touch operation in both directions (up/ down) on all four windows. • The cable design window regulator is used for all windows. • Anti-trap detection is through the use of the pressure sensitive finger guard. • The control of the front window motors is carried out in the respective door modules. • The control of the rear windows is carried out in the GM III. • The switch block/module on the driver’s door panel controls all four windows and the rear window lock out feature. System Components - with the Principle of Operation Each window switch has four positions. Two for the standard mode of operation: • Push to first detent and hold to raise/lower the window (1). Two for the one-touch mode: • Push to second detent and quickly release (quick strike) to automatically raise/lower the window (2). The signals from the switch block pass through the driver’s door via the P-Bus and on to the GM III and passengers door module. 42 Central Body Electronics ZKE III All window operations signals are digital inputs to the door module and GM III. • Comfort closing/opening of the windows from the driver’s lock cylinder. The remote key provides opening only. • When the ignition key is in accessory or “on” position press the switch to open or close the windows. Window operation is possible with the ignition switched off until a front door is opened or 16 minutes (maximum) has elapsed. • Window load switching is through relays. The front window control relays are located in the door modules, the rear window relays are in the GM III. The GM III monitors the cur¬ rent draw for end limit position. The maximum run time for the window motors is limit¬ ed to 6 seconds in the one-touch mode. This allows the motors to be switched off if the end limit load sensing fails. E53 Style Window Switches: The E53 power window switch design is a push - pull type switch. Each switch provides the GM with the coded ground signaling strategy as previous two wire switches. Pushing a switch to the first detent and holding provides a single ground signal on one wire requesting the GM to operate the window motor in the down direction. When released, the ground signal is removed and the window motor stops. Momentarily pushing the switch to the second detent and releasing provides an additional ground signal on the second wire requesting the “one touch mode”, operating the window motor automatically. The motor runs the window down until it reach¬ es the end stop. The switch functions in the same manner for the upward run of the window motor but the ground signal sequencing is reversed. 43 Central Body Electronics ZKE III Rear Window Child Lockout Switch: The rear window child lockout switch is incorpo¬ rated in the driver's side window switch block. It provides a constant ground signal to the GM preventing the windows from being operated from the rear door switches. The lockout switch ground signal is overridden by the GM if the MRS crash signal is acti¬ vated (MRS III equipped vehicles). Window Anti-Trap Detection: Each pressure guard at the top edge of each door frame consists of two contact strips that close when subjected to pressure. This provides anti¬ trap for the full travel of the window. When the contact strips close, the window will reverse direction. The contact strip does not require that the anti-trap feature be initialized prior to operation. The finger guard has a resistance of 1.2 KOhm and it is monitored for open circuits. Faults with the anti-trap system require that the window switch be held to close the window. The example shown represents the driver’s door window control and monitoring carried out by the Driver’s Door Switchblock Module (PM- FT/ SB). The passenger door window is controlled and monitored by the Passenger door module (PM-BT) and the rear door windows are both controlled and monitored by the General Module. 44 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs DRIVER'S DOOR PASSENGER'S DOOR ANTI-TRAP CONTACT P-BUS -> <- K-BUS c- WINDOW MOTOR ANTI-TRAP CONTACT POWER WINDOW SWITCH rO LIGHTING GM III KL 30 X WINDOW MOTOR ANTI-TRAP CONTACT LIGHTING ■@-1 POWER WINDOW SWITCH LEFT REAR DOOR KL 31 RIGHT REAR DOOR 45 Central Body Electronics ZKE III ->• I 1 Power Window Motors: The window motors are mounted on the cable regulators. The window motor control circuit consists of two wires for operating the motor in both direc¬ tions. The motors are activated by relays in the GM of door modules (front doors). The relays provide either power or ground depending on the direction of window travel. The GM controls the polarity of the motor based on a request to run the window (window switch, Convenience Opening/ Closing). The windows are run to the limit stops which is detect¬ ed by an amperage increase in the control circuit. Additionally, the window run cycle is limited to a 6-8 second duration if in case the amperage increase is not detected or there is a malfunction with the regulator. FRONT DOOR REGULATOR 615200114.eps Window Motor Limit Stop Function: If the windows are run up and down continuously a limit stop function is activated to prevent the window motors from overheating. The GM monitors the number of times the window motors are activated. Each cycle is counted and stored in memory. If the repetitive window activation (up/down) exceeds one minute, the GM deactivates the internal relays and disregards any further input requests. The GM provides motor activation after a short duration but not for the full one minute monitoring cycle. Over time, the GM slowly reverses the stored count of activation until the stored number equals 0. Convenience Opening/Closing: The GM provides the convenience open/close feature providing control of the power windows (and sunroof) from outside the vehicle with the key in the driver’s door lock cylinder. The FZV provides the same function for the opening only. • The anti-trap feature is active during convenience closing from the driver’s door lock. • The convenience open feature provides outside activation of the windows and sunroof in the same manner. • If the GM receives a request to operate convenience close or open for more than 110 seconds, the function is deactivated and a fault code is stored. • The Car Memory Feature can activate and deactivate the Convenience Open Feature from the FZV’s control. 46 Central Body Electronics ZKE III Sunroof Purpose of the System When the ignition key is in accessory or “on” position press the switch or slide it to the desired direction to lift (2), open (1) or close the sunroof. When lifting, the headliner retracts several inch¬ es. The sunroof can continue to operate after the ignition has been switched off as long as one of the front doors has not been opened. Mechanically, the sunroofs are similar in design. Some vehicles are equipped with the steel roof while others are equipped with the glass (moon) roof. The anti-trap feature of the sunroof uses a hall sensor to detect obstructions while the sunroof is closing. The initialization procedure must be carried out to allow the sunroof to operate in the opening direction and allow the anti-trap feature to function. The anti-trap is shut down 4mm prior to full closed and during the tilt closing function. System Components Sunroof Switch: Mounted in the sunroof motor trim cover, the switch provides coded ground signals for system operation. The following signals are generated over three wires: • Rest position. • Slide open request (press and hold switch - first detent of open position). • Automatic slide open request (press further to second detent and release). • Tilt open (press and hold). • Slide close request (press and hold switch - first detent of close direction). • Automatic slide close request (press further to second detent and release). 47 Central Body Electronics ZKE III Sunroof Motor/Module (SHD): The motor is powered to open, close and lift the sunroof panel. The motor contains two hall effect sensors that monitor the motor shaft rotation pro¬ viding sunroof panel position. The hall sensors also provide the end limit cut out function for the SHD once the system is ini¬ tialized. The SHD counts the pulses and cuts the motor out prior to the detected end run of the sunroof panel. The combined motor module has a pin con¬ nector for interfacing the switch, and vehicle harness (power, ground and Bus.) The electronic controls and relays are contained in the sunroof module (PM-SHD). The module is connected to the P-Bus (E38 >99 MY on the K-Bus) for comfort closing/open¬ ing and diagnosis/fault memory purposes. System Components: Inputs - Processing - Outputs 48 Central Body Electronics ZKE III Principle of Operation Initialization: Initialization is required for the SHD to learn the end positions of the motor's travel. The hall sensors provide pulses for motor rotation, the SHD counts the pulses and determines where the panel is by memorizing the stored pulses. If the system is not initialized, the sunroof will only operate in the tilt up and slide close posi¬ tions. Initialize as follows: • Press and hold the sunroof switch in either the tilt up or slide close positions for 15 sec¬ onds. • The sunroof motor operates momentarily signifying initialization acceptance. The SHD memorizes the pulses from the hall sensors on the next activation of the motor by driving the panel to its end run positions. The SHD senses an amperage increase and determines the end run position. The counted number of pulses is then used as the basis for calculating the panel position. Anti-Trap Feature: The anti-trap feature of the sunroof uses a hall sensor to detect obstructions while the sunroof is closing (pulse frequency slowed down) in the automatic close function. The anti-trap feature is shut down prior to full closing (4mm from full closed) to allow the sunroof to seat into the seal. Note: The anti-trap feature is not functional when the switch is held in the manual close position. Notes: 49 Central Body Electronics ZKE III Workshop Hints SHD Self Diagnosis The SHD monitors operation and stores fault codes if a defect is determined. The SHD monitors the following conditions: • SHD motor relays: The relays are checked for sticking contacts (plausibility) and non functional contacts. • Hall effect position sensors: The SHD must detect a pulse frequency from the hall effect sensor(s) during operation. • Sunroof Switch: The SHD monitors the signal plausibility of the coded signaling from the sunroof switch. Sunroof Fault Response Characteristics If a fault occurs with any of these functions, the SHD responds as follows: • Overrides the end run detection. • Switches the motor off if the relay contacts stick for more than 500 ms. • Switches the motor off if pulses are not received. Emergency Operation of the Sunroof If the sunroof motor does not respond to the switch signals, the hex key in the trunk lid tool kit is used to manually turn the motor shaft drive. 50 Central Body Electronics ZKE III Interior Lighting Purpose of the System The GM controls the interior lighting automatical¬ ly with the status change of several monitored inputs. The lighting can also be manually con¬ trolled using the interior light switch. In addition to the various time controls, the inte¬ rior lights are also subject to the 16 minute shut down of the GM (consumer protection). Principle of Operation The interior light switch is a push button switch that will carry out the opposite command of the current status of the lights, (ie: if the interior lights are currently on, pushing the but¬ ton will switch the lights off.) • If the interior lights are switched “ON” by the button with the ignition switched ON, the interior lights will remain on until they are switched off by the button. • If the interior lights are switched “ON” when the ignition is switched OFF, the lights will remain on for 16 minutes (consumer cutout). • Pressing the interior light button for longer than three seconds will switch the lights to continuous off. This feature is intended for workshop use. Pressing the button again will return the lights to the normal operational status. • Locking the vehicle from the outside will immediately switch off the interior lights. The ON/OFF conditions for the interior lights in the automatic mode are as follows: ON Conditions • Door Open. • Switching off ignition after exterior lights have been switched off. • MRS Control Module crash input. • Unlocking with FZV or pressing FZV lock button when the vehicle is already locked (interior search fution). OFF Conditions • All doors closed with ignition on. • All doors closed with ignition off after 20 seconds. • 20 seconds after switching off ignition with lights off. • 8 seconds after remote control activation. • 16 minutes with door(s) open. • When doors are locked. 51 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs 52 Central Body Electronics ZKE III System Components Door Contacts: As mentioned in the Central Locking Section, the existing door contacts opened/closed are also an input for the interior lighting function. The E53 uses the Hall effect sensors for the purpose of monitoring door open/closed status (located directly behind the rotary latch plate encased in the actuator). The sensor is activated by the rotary latch plate's position. • Door closed, the rotary latch plate is in the latched position. Current flow through the hall sensor is < 5 mA. • Door open, the rotary latch plate is in the open position. Current flow through the hall sensor is > 12 mA. A change in current flow informs the General module when a door is opened or closed. Front Seat Interior/Map Light Unit:The overhead front seat interior light unit contains a single main interior light. The light is controlled by the GM automatically or by momentarily pressing interior light switch located on the light assembly. The switch provides a momentary ground signal that the GM recognizes as a request to either turn the light on (if off) or turn the light off (if on). If the switch is held for more than 3 seconds, the GM interprets the continuous ground signal as a request to turn the interior light circuit off for the Workshop Mode. The workshop mode is stored in memory and will not come back on even if the GM is removed from it's power supply and reconnected. The switch must be pressed to turn the lights back on. There are two reading/map lights also located in the assembly. Each map light is mechan¬ ically controlled by depressing the corresponding on/off switch. The power supply for the map lights is supplied by the GM through the Consumer Cut Off circuit. 53 Central Body Electronics ZKE III Rear Seat Interior/Reading Light Units: In each C pillar trim panel is an interior/reading light unit. These units each contain an interior light that is controlled with the front interior light and a mechanically switched reading light on the con¬ sumer cut off circuit. Front Footwell Lights: In each front footwell, there is also a courtesy light. These lights are only operated when the GM provides power to the interior lighting circuit. On E38 and E53 the doors also contain courtesy lights at the lower edge of the door panel (1). Door Warning Lights (E38): The additional “red” warning lights are installed in the edge of the doors (2). These lights are illuminated when the doors are opened. H$1 015? Illuminated Transmission Shift Indicator (E38): The E38 uses a microprocessor for dis¬ playing the shifter position in the center console. The processor receives shift position signals from a console mounted range switch. The processor illuminates the LED corresponding to the position of the range selector. The park position LED will remain “on” after the ignition is switched off and stay on until the GM goes into the “sleep” mode. Soft Lighting Feature: The GM provides progressive voltage (up to 12v) providing the soft on feature to the interior lighting circuit when the interior lights are required. The GM grad¬ ually reduces the full 12 volt power supply providing soft off when interior light deactivation is required. 54 Central Body Electronics ZKE III Visual Entry Aid (E38/E53) Purpose of the System The E38 (>99 MY) and E53 is equipped with the “Visual Entry Aid” lighting system which enhances operator convenience and safety. All interior door handles are supplemented with soft glow lighting for ease of locating the interior door handles. When activated, the exteri¬ or door lighting illuminates providing a subtle underglow for the exterior door handles on the E38 and exterior rear view mirrors on the E53. • The interior door handle lighting (including later E53) is provided by slim profile LEDs and controlled directly by the LCM III. • The exterior door handle lighting is provided by halogen bulb light sources in each door and fiber optic tubing. The light sources are controlled by a Visual Entry Aid Control Module which activates the lights simultaneously when the GM III activates the vehicle interior lights. System Components Interior Door Handle Lighting: The light¬ ing is provided by orange glow light strips illuminated by LED’s. • The light strips are part of the door han¬ dle shell and are not replaceable. • The LED’s are individually replaceable. “Orange Glow” Light Strip The LED’s are connected to the KL 58g interior panel lighting circuit. KL 58g is an output pulse width modulated control signal from the LCM III. The duty cycle changes when the LCM III detects a change in the voltage drop at the light dimmer input signal. 55 Central Body Electronics ZKE III Exterior Door Handle Lighting: The Visual Entry Aid Control Module is located in the elec¬ trical carrier forward of the glovebox. To control the system, the Visual Entry Aid con¬ trol module requires: • KL 30 • KL 15 • KL 31 • Interior Light control signal (GM Output) The GM controls the soft on/off feature of the vehicle interior lights by a pulse width mod¬ ulated control signal. This signal is also an input to the Visual Entry Aid control module which requests simultaneously control (soft on/off) each exterior door light source. Light Source Modules: Mounted in each door are the light source modules. The light source modules are made up of the housing, halogen bulb and reflector. The reflec¬ tor holds the bulb and focus the bulbs light into the housing. The bulbs are are available for individual replace¬ ment. 615200123.eps 56 Central Body Electronics ZKE III Fiber Optic Light Conductor Cable: The fiber optic cables carry the light to their respec¬ tive light output modules at each exterior door handle. Installation Note: The bending radius of the fiber optic cable should be less than 20mm when installing. 615200131.eps Light Output Modules: The exterior door handle frames have an additional mount to accept the light output module. The light output modules carry the light from the conductor cables to the exterior door han¬ dle recess as well as casting a soft exterior light on the outside floor area. Principle of Operation Lights ON: The exterior visual entry aid lighting is activated “on” when the vehicle interior lights are activated “on” automatically by the GM. Lights OFF: Immediately after KL 15 recognition (immediate off - no soft off function). Soft off after a short delay once all doors are closed. After a maximum of 20 seconds “on” time, the control module switches exterior visual entry aid lighting off regardless of interior light status. 57 Central Body Electronics ZKE III Seat/Mirror/Steering Column Memory Purpose of the System The front seats, outside rearview mirrors and steering column (if equipped) positions are electrically adjustable. The “customized” adjustment positions can be memorized and stored for three diferent users and recalled back to the individual positions (with the excep¬ tion of the passenger seat - not in memory). The basic features of seat/mirror/steering column operation, as well as the memory posi¬ tions is integrated into the ZKE III system. System Components: Inputs - Processing - Outputs • Seat/Steering Column Memory Module (PM SM). • Driver’s Door Switchblock Mod¬ ule (PM FT/SB - early E38 was separate). • Passenger’s Door Module (PM BT - E53 combined with window switch). • General Module (GM III). • 3 Position Memory Switch. • Seat Switch. E38/E39 Shown MEMORY SWITCH MIRROR SWITCHES DRIVER'S DOOR SWITCHBLOCK MODULE (PM-FT/SB) O P-BUS DRIVER'S SEAT MEMORY MODULE (PM-SM) STEERING COLUMN SWITCH 5 DRIVER'S _ x MOTORS (C(w(w(WW) o (m)(m) 2 STEERING COLUMN MOTORS • Steering Column Switch. DRIVER'S DOOR MIRROR PASSENGER'S DOOR MIRROR • Seat/Steering Column/Mirror Motors. The Seat/Steering Column Memory Module communicates with the DISplus or MoDiC for diagnosis and Vehicle Memory encoding. 58 Central Body Electronics ZKE III System Components - with Principle of Operation Manual Operation: The manual adjustments of the seat, mirrors and steering column are carried out with the respective switches as with the previous systems. The mirror adjustment switch is located in the driver’s switch block. The mirror operation input is a digital signal that is processed by each respective module for mirror positioning. Memory Storage: The parameters for storing memory positions are are as follows: • With the transmission range selector in “P” and the mirror change over switched to the left, switch the ignition on and press the “M" on the memory switch. • The memory indicator lamp swi¬ tches on for 7 seconds. • Press one of the three position switches (1,2 or 3) within the 7 second memory period. • The current positions of the mir- memory switch rors, seat and steering column are stored for recall. The positions of the mirrors are stored in the respective door modules based on the position of the feedback potentiome¬ ters. The positions of the seat and steering column are stored in the seat module, based on the ripple count. Recalling a memory position setting is possible by either pressing and holding the recall switch (1, 2 or 3) with KL 15 “ON” or tapping the recall button (1,2 or 3) with: • The driver’s door open and KL 15 “OFF”. • KL R ON and KL 15 “OFF”. The recall movement can be interrupted at any time by touching any of the adjusting switches. 59 Central Body Electronics ZKE III Mirror Principle of Operation The output stages and memory storage of mirror positions is handled by the respective door modules. The positioning of the mirrors is signaled from the driver’s door switch block/module. The signal passes over the P-Bus to the passenger’s door module. The memory/recall for the driver’s mirror comes directly into the door module from the memory switch. The operation for the passenger’s side mirror is carried out over the P-Bus from the driver’s door module to the passenger’s door module. E39 Shown TRANSMISSION RANGE SELECTION AIR TEMP IKE (540i) -or- Instrument Cluster (528i) K-BUS DRIVER'S DOOR SWITCHBLOCK MODULE (PM-FT) GM III P-BUS o I PASS. DOOR MODULE (PM-BT) DRIVER'S DOOR MIRROR PASSENGER'S DOOR MIRROR The memory positions are stored in each respective module. The memory position is rec¬ ognized by the feedback potentiometers located on each mirror motor. The reverse gear tilt feature for the passenger's mirror is signaled from the GM, over the P- bus, when reverse is selected and the mirror switch is set for the driver's side . Mirror heating is controlled by each respective door module. The GM receives the outside temperature from the IKE and passes it to the door modules. The “ON” time for mirror heat¬ ing is adjusted based on the outside temperature. A pulsed heating cycle is used for the mirrors based on the outside temperature. Temperature <-10°C -10 to 0°C 0 to 15°C 15 to 25°C >25°C ON - duration 100% 75% 50% 25% 5% 60 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs - REVERSE GEAR SIGNAL - OUTSIDE TEMPERATURE 61 Central Body Electronics ZKE III Driver’s Seat (E38/E39) Principle of Operation Each motor for seat adjustment contains a micro-processor (called a Ripple Counter) that receives a digital signal from the seat control module for motor activation. The motors are connected to KL 30 and KL 31 and respond to the signals generated by the seat module when seat movement is requested. The seat adjustment switch provides ground input sig¬ nals to the module when seat movement is desired. The module processes these input sig¬ nals and sends output signals to the seat motor processors. The seat motor processors activate the motors and the seat moves to the desired point. The circuitry of the Ripple Counter detects the motor activation current. As the armature segments of the motor rotate passed the brushes, the current flow rises and falls produc¬ ing a ripple effect. The peaks of these ripples are counted and stored in the Ripple Counter module. The memory function of the seat module uses this ripple count instead of feed¬ back potentiometers to memorize and recall seat positions. Ripple Count Recognition: When the seat is installed and the battery is connected, the ripple counter uses the initial position of the motors as the “Zero Position”. Any movement from this point is counted as “+” or pulses as the motors move in either direc¬ tion. 615200137.eps The pulse position of the motors is stored in the seat module, in an EEPROM (of the PM- SM), before the ZKE goes into its “Sleep Mode”. This prevents the position recognition from being lost. If the battery is disconnected before the 16 minute sleep mode activation, the memory positions of the seat will be lost and reprogramming will be required. Diagnosis: The PM-SM communicates with the DISplus or MoDiC. The PM-SM monitors the seat motors and circuits as well as it's internal operation. Any detected faults are stored in the PM-SM fault memory and are called up when diagnosing the system with the Fault Symptom diagnostic plan. The PM-SM also provides status display to the DISplus of the input and output control signals as well as component activation. 62 Central Body Electronics ZKE III Passenger’s Seat (without memory) Principle of Operation The passenger seat control switch is purely a mechanical switching module that activates the passenger seat motors without position monitoring capabilities. Due to the limited op¬ eration requirements, the passenger seat control switch is not equipped with on board diagnostics. The Passenger Seat control switch is equipped with an overload protection function. If excessive amperage is drawn due to a defective motor or a switch is stuck driving a motor to the end limit, the function activates opening the motor control circuit. Passenger Seat Motors: Each motor is individually controlled by the Seat Control Switch. Each position motor is connected to the seat position switch by a two wire circuit provid¬ ing motor activation in both directions (no position recognition). Passenger Seat Adjustment: Operation of the passenger seat is always possible regard¬ less of the ignition key position. Moving a position switch operates a the motor control con¬ tacts directly, the switch applies voltage and ground path directly to operate the motor. Reversing the switch simply changes the motor polarity. More than one passenger seat motor can be run simultaneously. Optional Seat Back Lumbar Support The optional air bladder lumbar support system is similar in all vehicles (if equipped). Each seat contains the following com¬ ponents: • Four position circular rocker switch in the seat base trim in the area of the seat switches. • Electrically controlled air compressor with over pressure cut out under each seat. • Two solenoid activated air controlling valve blocks (one per air bladder). Each valve block includes an inlet and an outlet valve. When energized they direct air into the bladder(s) to inflate or relieve trapped air to deflate the bladders. • Connecting hoses and air bladders in lower seat back. 63 Central Body Electronics ZKE III Principle of Operation The lumbar support system can be operated at any time regardless of key position. The four position circular rocker switch provides power switching to operate the system as fol¬ lows: • Position 1: The internal switch contacts provide a power and ground path for both valve block inlet valves and the air compressor. Both bladders inflate until the switch is released. If the switch is held continuously, an overpressure bypass valve opens on the compressor preventing damage to the bladders. • Position 2: Compressor activated, upper bladder inflates, lower bladder deflates. • Position 3: Compressor activated, lower bladder inflates, upper bladder deflates. • Position 4: Compressor is not activated. Upper and Lower bladders both deflate. h.L JU 3b This function is not stored in memory for recall. Diagnosis The seat lumbar support system is purely electro-pneumatic control system. No electron¬ ic diagnostic communication is possible. 64 Central Body Electronics ZKE III Comfort Seats (standard on E38 750iL, other models if equipped) This option provides additional back support in the shoulder area. An additional adjustment in the upper backrest allows forward “contour” that is controlled by a rocker switch in the side panel. When the ignition is on or off, the two way rocker switch can be pushed until the desired setting is achieved (for¬ ward/backward tilt). The motor drive operates the same as the seat motors. The shoulder support adjustment is also stored in memory for recall. Active Seat (E38 - if equipped) Purpose of the System Actively changing the surface of the seat helps to prevent muscle tension and fatigue par¬ ticularly on long trips or sitting in one position for a long period of time. The seat causes weight transfers which are slight and imperceptible enhancing driving comfort. The basic seating position is not changed by this. In the seat’s upholstery beneath the surface of the seat is a cushion of fluid on the left and right. The fluid is slowly circulated back and forth between the cushions by a pump. 65 Central Body Electronics ZKE III Principle of Operation To activate this feature, the ignition must be in the KL R or KL 15 and press the switch located in the Center Console Switch Center (driver and/ or passenger front seat). The switch provides a ground to the control module and an LED in the switch will illuminate. If there is a fault in the system the LED will not illuminate. The control module, fluid bladders (2 and 3) and pump (1) is contained in each seat. The pump contains a Hall sensor to monitor the number motor revolutions and two pressure sensors to monitor each bladder for vacuum (indicating empty). The fluid bladders (2 per seat) contain water- glysantin mixture and are connected to the fluid pump. The fluid bladders are equal in volume at rest (15 mm. high) and will raise from 0 up 30 mm. when filled alternately from left to right. Note: The pump unit and fluid bladders are replaced as a unit. The control modules (one per seat) are connected to the P-Bus. The driver’s side control module contains an acceleration sensor that monitors transverse acceleration of the vehi¬ cle. Active Seat operation is temporarily interrupted during high acceleration. Rear Power Seat (E38 750iL) The rear seats in the 750iL provide electric adjustments for: 1. Backrest Angle - Control switch powers the motor. 2. Headrest Height - Control module behind each upper seat. 3. Lumbar Support The headrest automatically extends when a passenger fastens the safety belt and will automatically retract when the safety belt is released. The power rear seat is a purely electric control system. No electronic diagnostic communication is possible. 66 Central Body Electronics ZKE III Seat Heating Operation (from 99 MY) Principle of Operation The front seat heaters are adjustable through three ranges of heating output temperature. Pressing the respective seat heater button once provides stage 1: • All three LEDs illuminate and the heating elements are provided regulated output current producing a seat temperature of 111°F. Pressing the button a second time provides stage 2: • The top LED switches off and the heating elements are regulated to an output tempera¬ ture of 102°F. Pressing the button a third time provides stage 3. • The top and middle LEDs are off and the heating elements are regulated to an output tem¬ perature of 95°F. The SZM monitors the seat heating element temperature via an NTC feedback signal to regulate the output current which maintains the seat temperature. Seat heating is switched off by pressing the button a fourth time, pressing and holding the button for more than 1 second or when the ignition is switched off. System Components Carbon Fiber Heating Pads: In each seat is a two section heating pad wired in parallel. The heating pads are resistors which when powered produce radiant heat. The seat base heating element also contains a temper¬ ature sensor for feedback to provide the temperature regulation output control. 615200139.eps 67 Central Body Electronics ZKE III Center Console Switch Center (SZM): From 1999 MY E38, E39 and E53 vehicles are equipped with a SZM to control the front seat heating and provide a diagnostic interface with the DISplus/MoDiC via the K BUS. The SZM directly controls: • Front Seat Heating • Rear Window Roller Blind SZM also provides a unitized switching center for: • Park Distance Control (PDC) • Dynamic Stability Control (DSC III) • Electronic Damper Control (EDC). The switch signal output for these systems is a direct output signal. All diagnosis functions are carried out through their respective control systems. SZM Monitoring of Seat Heating Battery Voltage: The SZM switches current supply to the heating elements off when bat¬ tery voltage drops below 11.4 volts. However, the heating stage LEDs remain on. Regulated output current resumes when battery voltage raises above 12.2 volts for more than 5 seconds. SZM Internal Temperature: The power output stages for the seat heating elements gen¬ erate a considerable amount of heat when in stage 1 operation. The SZM monitors it’s own internal temperatures and reduces the heating output when internal temperatures rise to a temperature of 185°F or switches it off completely above 203°F. As with battery voltage monitoring, the heating stage LEDs remain on when these temperatures are exceeded. Fault Monitoring: The SZM monitors the temperature sensors and heating mats for faults. Detected faults are stored in the SZM. Fault Symptom Troubleshooting in conjunction with stored faults will initiate the diagnostic paths using the DISplus/MoDiC. The following faults can be recognized: • Shorts or opens in the wiring circuits. • Shorts or opens in the temperature sensors. • Open in heating element. If a short is detected in the temperature sensor, the seat heating is switched off to prevent overheating. The Stage LEDs are also switched off with this fault present. 68 Central Body Electronics ZKE III Rear Window Roller Sunblind Operation The roller sunblind is activated by momentarily pressing and releasing (one touch) the sun- blind rocker switch in the SZM. The SZM activates the motor in the appropriate direction. The SZM switches the motor off when the motor amperage increases indicating the blind has reached the end of its intended travel. Fault Monitoring: The SZM continually monitors the motor drive amperage loads to deter¬ mine jamming or blockages. If current values exceed preset values, the motor is switched off immediately. Faults are stored in the SZM for opens or shorts in the motor or motor’s wiring circuit. The SZM also provides diagnostic requests to monitor the switch input status via the DISplus/ MoDiC. System Components: Inputs - Processing - Outputs ri~ia_o~n- ciiim KL 30 (BATTERY) KL 31 (GROUND) KL 15 (IGNITION ON) KLR (ACC) KL 87 (OPERATING POWER) 58G (PANEL LIGHTING) •^ LCM III 3 SZM ■■■© --Q -Q ■■■© DRIVER’S SEAT HEATING +A •-1 ‘— ‘n L-o o PASSENGER’S SEAT HEATING V? b L-o o DIS & MoDiC REAR WINDOW ( M ) ROLLER V BLINDS PDC CONTROL MODULE EDO CONTROL MODULE DSC CONTROL MODULE I ^ ACTIVE SEAT CONTROL MODULES 69 Central Body Electronics ZKE III Steering Column Principle of Operation The electrically adjustable steering column used in the various models (if equipped) is similar in components, mechanical link¬ ages and electrical operation. The steering column adjusting switch is mounted on the left side of the steering column and provides for four directions of column movement. The steering column switch inputs are processed by the seat module. Motor Drives: Forward/Back (T alescope) A flexible drive shaft operates a screw drive which causes a for¬ ward/back movement of the stee¬ ring column. Up/Down A flexible drive shaft moves an off- center lever causing up/down steering movement. The motors for tilt and length also employ ripple counter modules for motor control and memory recall. The control electronics for the steering column are integrated into the seat module. The output signals are sent from the seat mod¬ ule to the steering column ripple counter mod¬ ules for motor activation. 70 Central Body Electronics ZKE III System Components: Inputs - Processing - Outputs FORWARD UP & DOWN SEAT BASE BACKREST HEADREST & BACK TILT ANGLE ANGLE UP & DOWN Entry/Exit Aid The Steering Column Memory provides the feature of raising the steering column to ease in exiting the vehicle and return it to the previous position after the vehicle is entered. Raising the Steering Cojumir Lowering, the Steering. Columm • The ignition is switched “off”. • The ignition is switched to KL 15. • The ignition is switched to KL R • The Handbrake is released or the door is closed, and the driver’s door is opened. • The ignition is switched to KL 15, The steering column recall movement can be inter- driver’s door open with the hand- rupted at any time by tapping the adjusting lever. brake applied. 71 Central Body Electronics ZKE III Servotronic (E38 only) Purpose of the System The servotronic steering system is based on a conventional power assisted steering sys¬ tem. An additional electro-hydraulic solenoid and oil passageways are added to the con¬ ventional worn and roller type steering box. The GM monitors the vehicle’s road speed and regulates an electro-hydraulic solenoid. The servotronic steering system provides the fol¬ lowing: • A light steering effort at low speeds and while parking. • Increased steering effort as road speed increases. PUMP The "Direct Hydraulic Reaction" provided by the system allows the frictional forces between the front wheels and road surface to be transmitted to the driver. This allows the driver to make a better judgment in regard to the driving conditions. This principle of direct hydraulic reaction can be used with the servotronic system because of the spool valves that are already used with the worm and roller steering box. Refer to ST056 Chassis Dynamics for further “mechanical” details of Servotronic. 72 Central Body Electronics ZKE III System Components Electro-Hydraulic Solenoid: The solenoid regulates the amount of power steering assist for the servotronic system. It contains a needle valve that can restrict oil flow. When current is applied, the needle valve closes against spring pressure to restrict the oil flow. With maximum current applied, the valve is closed. This is the condition of the valve for slow speed driving and parking. Without current applied, the needle valve is held open by spring pressure. This is the condition of the solenoid during higher driving speeds. Electro-Hydraulic Solenoid Control: The GM monitors the road speed input and sup¬ plies the electro-hydraulic solenoid with power. The road speed signal “A” is supplied from the IKE (and K-Bus) on E38 vehicles and from the DSC Control Module on E39/E53 vehi¬ cles. The solenoid is pulse width modulated for control and varies the amount of assist based on the road speed. The maximum assist is available while parking and driving at slow speeds. 73 Central Body Electronics ZKE III Principle of Operation Control logic (example E38) includes: • Servotronic control electronics active with KL R being switched "ON" - ensure no delay in operation if engine is started and vehicle is immediately driven. • Plausibility check for speed signal - the control electronics monitor both the Speed sig¬ nal "A" from the IKE and the vehicle speed signal on the K-Bus. • The ability to detect both acceleration and deceleration from the two speed signals - the speed signal from the IKE is updated every two seconds. • The servotronic assist is reduced gradually when the vehicle is under acceleration. • The servotronic assist is adopted to the lower direct reading during decel or braking. Electric/electronic failures with the servotronic system will result in the following: • Power/electronic failure of the control module or solenoid - steering assist the same as high speed driving (increased effort). • Vehicle speed signal missing - control module retains the assist mode in effect when the speed signal was lost. • Speed signal implausible - steering assist the same as high speed driving (increased effort). The GM also provides the diagnostic “gateway” to the Servotronic status and Component Activation via the DISplus/MoDiC. 74 Central Body Electronics ZKE III General Functions of ZKE III Consumer Cut Off The Consumer Cut Off function interrupts battery voltage to circuits preventing inadvertent battery drain if one of these consumers were to remain activated. Circuits controlled by consumer cut off will be switched off as the GM enters into the sleep mode. For example, the interior lights are connected to the consumer cut out circuit (KL 30) and can remain on if one of the control switches are left on. The consumer cut off will deacti¬ vate KL 30 to the interior lighting after 16 minutes (or with the DISplus/MoDIC). The following circuits are con¬ trolled by consumer cut off: • Map/Reading Lights • Glove Box/Luggage Compart¬ ment Lights • Transmission Range Indicator Light • Overload Protection Relay for - Power Seat Motors - Steering Column Motors KL 30 16 MINUTE PRE¬ SLEEPMODE OUTPUT VOLTAGE MAP LIGHTS GLOVE BOX LIGHT TRUNK LIGHT TRANS RANGE SELECTOR INDICATOR MODULE REST FUNCTION SIGNAL (Rest function is cancelled when this signal goes low after 16 minutes) CONSUMER CUTOFF/ OVERLOAD PROTECTION RELAY MODULE SEAT MEMORY MODULE 2 STEERING COLUMN MOTORS 5 SEAT MOTORS i L_t _1 l_f_ 1 1 l _ ] || • pxcrrrTTTTill HI j [ _ 1 .... 1 i '1 ;■ i_ i i i 1 1 : : III 1 : _ Overload Protection The seat and steering column motors receive operating power through the consumer cutoff/ overload protection relay module. The consumer cutoff signal from the GM signals the relay to maintain operating power to the consumers. If the relay module detects an increase in amper¬ age (overload) the relay will open. The relay mod¬ ule (K-72) is located in the electrical carrier behind the glove box. The relay is reset by switching the ignition “off” for 16 minutes, dis¬ connecting the relay or the DISplus/ MoDIC. E38 Shown 9 Overload Protection Relay Modul nrl e hf -n i MJ® -n i- -i Oil 75 Central Body Electronics ZKE III Sleep Mode To lower the constant battery draw when the vehicle is parked, the complete ZKE system will go into the “Sleep Mode” 16 minutes after the ignition has been switched off and no further ZKE function is active. For example, the approximate E39 (528i) Battery draw is: • Ignition switch off = approx 750 mA. • One minute after = approx. 560 mA. • After 16 minutes (sleep mode) = approx. 18 mA. All modules in the ZKE system will go into the sleep mode. The P-Bus remains active, how¬ ever no data transfer takes place until a wake-up request is received. The general module, door modules or keyless remote module can wake the system up and put the ZKE back on line. The K-Bus is active (high) in the sleep mode. Sleep Mode Criteria: KL R, KL 15 OFF and no further function activated for 16 minutes. Wake Up Criteria: KL R or 15 “ON” or a change in one of the signals listed below. SIGNAL ACTIVITY ORIGINATING MODULE K-BUS High General Module Door jamb switches (possibility of 4) Low Trunk lid lock cylinder microswitch High tt Trunk lid pushbutton microswitch Low u Interior Trunk lid pushbutton microswitch Low a Central locking button Low n Hood microswitch Low n Trunk Lid microswitch Low n Interior light switch Low u FIS sensor Low a Tilt Alarm sensor Low tt FBZV operational signal High FBZV Module Driver’s door lock microswitch - (lock) High PM-FT/SB “ “ “ “ - (unlock) High it Passenger door lock microswitch - (lock) High PM-BT “ “ “ “ - (unlock) High tt 76 Central Body Electronics ZKE III Battery Status The GM monitors KL R on a dedicated circuit. If the ignition is switched on and detected via the KL R circuit but the GM does not receive KL R status via the K Bus, the GM mon¬ itors the KL R voltage level. If after an additional 0.3 seconds there is no K Bus activity, the GM initiates an emergency running program. A substitute value for vehicle speed is used to allow the GM to operate certain functions. The emergency running program will terminate if the GM detects a vehicle speed or KL R status via the K bus. Diagnosis/Troubleshooting The GM contains an EEPROM fault memory. Diagnosis and troubleshooting is carried out with the DISplus or MoDiC. The diagnostic link is through the Instrument cluster over the K bus to the GM. Notes: 77 Central Body Electronics ZKE III Control Module Locations E39 Sport Wagon 3ij n ro-3 l" Module iklii'iii Aiiipimei □MEAGE m DSC III ll Ij a ■. ii V li i Audi? ■VffbBiM twiih wn; FZWFM2 AniinnH ArinplllVer VtniHlHr "I p*F Eiefi -*—* r - >1 J - p. ■* , vv m i i P i T C i _ / r r i A !i fusee Eht XENON JS- „ #//» IWC III *^5 i -INftA -MID ar ’ -BZM Tape - f'inyHr HltQII l^i□ n NAV> i I GM lIP^ ■ EMyfi “ UVR □■PS Amentia U| ■ i ¥ ■ yl T Ml L Ittnicthu Or NKI linn _ ■ | UIS ■ tvnnwf Module Hadla EhinErnnica |Wlth NAYl j mvifu A^**piilkT vi I FZWFHfZ Anl ■ nmi &3W Module S^iknUock NAV-Cwtip 4,rF,pllh<,r unroo GPS Antenna Door Module Switchblock =fti . FZV/FM2 Radio NAVComp Antenna Electronics Amphfier when NAVeauiooed 78 Central Body Electronics ZKE Review Questions 1. List the functions directly controlled by the GM III. 2. How does the GM III communicate with other control modules? 3. What effect does road speed have on the wiper system? What effect does it have on an AIC equipped vehicle? Where does the road speed come from?_ 4. How does the GM III recognize the key position from the drivers door? 5. Describe the procedure used by the GM III to recognize an FZV key. Can the GM differentiate between different keys? How many can it recognize?_ 6. What “convenience” features are available from the FZV key? 7. Describe what happens when the GM receives the crash signal from the MRS. 8. Why does the SHD (sunroof) module require initialization but the windows do not? 79 Central Body Electronics ZKE III 9. What type of sensor is used to detect the position of a seat with Memory? What type of signal does it produce?_ 10. How does the Seat Module communicate a request for a stored memory position with the mirror modules? 11. On an E38 with Servotronic, why is the speed signal provided to the GM from both the IKE “A” signal and the K-Bus?_ 12. An E38 customer complains that when exiting the vehicle the steering wheel moves up. What is the cause of this?_ 13. How does the SZM monitor the Seat Heating temperature? 14. What circuits are controlled by Consumer Cut Off? 15. If a technician double locked a 2000 MY E39 while still inside the vehicle, how could he/she exit the vehicle? 18. What functions will deactivate the exterior door handle lighting? 80 Central Body Electronics ZKE III