Table of Contents E70 PowerWindows Subject Page Introduction .3 System Overview .4 System Circuit Diagram .5 Examples of the Window Switch Signal Path .6 Driver's Door .6 Front Passenger's Door.6 Rear Doors .6 System Components.7 Control Elements.8 Driver's Door Switch Cluster.8 Window Switch Signal Evaluation .8 Control Units.9 Car Access System 3.9 Footwell Module .9 J unction Box Control Unit.9 Remote Control.9 Power Window Motors .9 Principles of Operation.10 Opening and Closing .10 Toll Function .10 Comfort Opening and Closing .12 With Remote Control.12 Via the Driver's Door Lock Barrel.12 With Comfort Access.12 Anti-Trap M echanism .13 Panic M ode.13 Load Shut-Down,Terminal 50 .14 Thermal Protection .14 Service Information.15 Initialization .15 Via Window Switches .15 Via the BMW Diagnosis Equipment.15 Initial Print Date: 10/06 Revision Date: Power Windows Model: E70 Production: From Start of Production ■MICIWIS After completion of this module you will be able to: • Understand and explain the power window system used in the E70 X5 2 E70 PowerWindows Introduction The E70 has been fitted with electric power windows since the start of series produc¬ tion. All power windows are equipped with an indirect anti-trap mechanism through the use of hall sensors mounted inside each motor assembly. The electric power windows have the following functions: • Opening and closing • One-touch /Toll opening and closing • Comfort opening and closing 3 E70 PowerWindows System Overview Index Explanation Index Explanation 1 Footwell module 8 ID transmitter 2 Power window motor, front doors 9 Car Access System 3 CAS 3 3 Power window motor, rear doors 10 Driver's door switch cluster 4 J unction box control unit 11 Lock with door contact 5 Power window switch, driver's side rear/pas¬ senger side front and rear 12 Lock cylinder, driver's door 6 Outside doorhandle for Comfort Access K-CAN Body CAN 7 Comfort Access Bus-LIN Local interconnected network bus 4 E70 PowerWindows System Circuit Diagram Index Explanation Index Explanation 1 Driver's door power window motor 11 Car Access System 3 CAS 3 2 Indirect anti-trap mechanism, driver's door power window 12 Power window switch, driver's side rear 3 FRM footwell module 13 Power window motor, driver's side rear 4 Indirect anti-trap mechanism, passenger side front power window 14 Indirect anti-trap mechanism, driver's side rear power window 5 Power window motor, passenger side front 15 SBFA driver's doorswitch cluster 6 Power window switch, passenger side front K-CAN Body CAN 7 Indirect anti-trap mechanism, passenger side rear KL. 30g Terminal 30 switched 8 Power window motor, passenger side rear KL. 58g Terminal 58 switched 9 Power window switch, passenger side rear LIN-Bus Local interconnected network bus 10 J B junction box control unit 5 E70 PowerWindows K-CAN Signals on Roof Function Center In/Out Information Source/sink Function In Status of terminal 50 Car Access System 3 >FZD Interruption in adjustment procedure for powerwindow In Outside temperature Outside temperature sensor Value used to determine the thermal protection of the powerwindow motors In Comfort Closing Outside door handle > Comfort access Comfort closing of the powerwindows Out Anti-trap mechanism deactivated Roof function center > Instrument cluster CC message display Out Anti-trap mechanism deactivated J unction box control unit > Instrument cluster CC message display The Car Access System 3 (11) issues the enable to actuate the powerwindow motors (1, 5, 8 and 13). If a powerwindow switch is then activated, the footwell module (3) (front powerwindow motor) orthe junction box control unit (10) (rear powerwindow motor) executes the desired request. Examples of the Window Switch Signal Path The following examples of a signal path show the path taken by the signal before the powerwindow motoropens orcloses the window. A requirement is that the Car Access System 3 has issued the enable for operation of the power windows. Driver's Door When the powerwindow switch forthe window in the driver's doororfront passenger's door is operated, the signal is routed via the LIN bus to the footwell module. The footwell module drives the corresponding powerwindow motor. The signal is routed from the driver's door switch cluster via the LIN bus to the footwell module when the powerwindow switches forthe windows in the rear doors are operated. The footwell module sends the signal via the K-CAN to the junction box control unit. The junction box receives the signal and activates the corresponding powerwindow motor. Front Passenger's Door The signal is routed to the junction box control unit when the powerwindow switch in the front passenger's door is operated. The junction box control unit sends the signal via the K-CAN to the footwell module. The footwell module controls the powerwindow motor. Rear Doors When the powerwindow switches in the rear doors are operated, the signal is routed to the junction box control unit. The junction box control unit drives the powerwindow motor. 6 E70 PowerWindows System Components The following graphic shows all the components of the power window system together with the respective control units and control elements. The following components are described: • Control elements • Control units - Car Access System 3 - Footwell module - J unction box control unit • Powerwindow motor a * r-TII \L> si) Index Explanation Index Explanation 1 Car Access System 3 3 J unction box control unit 2 Footwell module 7 E70 PowerWindows Control Elements Driver's Door Switch Cluster The driver's door switch cluster is connected via the LIN bus to the footwell module. For opening or closing, the power window switch has two notch positions. The first notch position is used forthe manual powerwindow function.The second notch posi¬ tion (press) is used forthe toll function of the powerwin- dows. The powerwindow switches are resistance coded and switched to earth. The following graphic shows the princi¬ ple of a resistance coded switch. Window Switch Signal Evaluation The signals of the powerwindow switch in the driver's door switch console are evaluated directly by the driver's door switch cluster and transferred to the footwell module via the LIN bus. The signals from the powerwindow switches in the front passenger's door as well as the powerwindow switches of the both rear doors are evaluated by the junction box control unit. Index Explanation 1 Illumination of powerwindow switch 2 Resistance-coded switch 8 E70 PowerWindows Control Units Car Access System 3 The Car Access System 3 is the central control unit for opening and closing the windows. Therefore, it issues the enable to operate the power windows During the engine start phase, it is not possible to move the power windows. This means more energy from the battery is available forthe starter during engine start-up. Footwell Module The relays forthe power window motors forthe front doors are installed in the footwell module. The footwell module provides information on the status of the door contacts and the dri¬ ver's door lock cylinder. The footwell module also provides the power window switch and the driver's door switch console with information on the "Terminal 58g ON" status. J unction Box Control Unit The relays forthe powerwindow motors forthe rear doors are installed in the junction box control unit. Remote Control The remote control can initiate the comfort opening/comfort closing procedure forthe power windows. Note: The ID transmitter can also perform the functions of the remote control. The comfort opening and closing function with the ID transmitter is therefore the same as with the remote control. PowerWindow Motors The powerwindow motors are equipped with Hall sensors that generate signals during motor operation. These signals serve the purpose of monitoring motor operation and are evaluated forthe anti-trap mechanism. The signals are evaluated in the footwell module and the junction box control unit. 9 E70 PowerWindows Principles of Operation The functions of the powerwindows on the E70 are: • Opening and closing • Opening and closing with toll function • Comfort opening and closing • Indirect anti-trap mechanism • Panic mode • Load shut-down at terminal 50 • Thermal protection of power window motors Opening and closing The Car Access System 3 has the central control function forelectric opening and closing ofthe powerwindows. This means that the Car Access System 3 issues the enable to open and close the powerwindows. The footwell module and the junction box control unit actuate the powerwindow motors and monitorthe motorspeed ofthe respective powerwindow motor. This means the footwell module orthe junction box control unit can respond to the following operating situations: • Trapping • Overheating ofthe powerwindow motor • Seizing of the power window motor. Opening and Closing The corresponding powerwindow motor is activated in OPEN or CLOSE direction by pressing or pulling the powerwindow switches to the first notch position.The power window motor remains active until the corresponding powerwindow switch is released. To ensure the powerwindow is closed securely, the powerwindow motor is briefly dri¬ ven to block status at the limit stop. Toll Function The toll function is implemented forall powerwindows.The corresponding powerwin¬ dow motor is driven in the OPEN orCLOSE direction by pressing or pulling a powerwin¬ dow switch beyond the limit stop. The powerwindow motor moves the window automatically until it is completely open or closed. Powerwindow operation is stopped when the powerwindow switch is pressed or pulled again. 10 E70 Powerwindows Byway of example, the opening and closing procedure for one of the rear windows is illustrated bythe signal path in the following graphic.The opening orclosing function is initiated from the driver's door switch cluster. Inde X Explanation Index Explanation 1 SBFA powerwindow switch in driver's door switch cluster LIN-bus LIN bus 2 FRM footwell module K-CAN BodyCAN 3 Car Access System 3 CAS 3 KL. 30g Terminal 30g 4 J B junction box control unit KL. 58g Terminal 58g 5 Powerwindow motor 11 E70 PowerWindows Comfort Opening and Closing Comfort opening or closing can be performed with the remote control/ID transmitter via the door lock in the driver's doororthe outside driver's/passenger's doorhandle. Comfort opening with remote control The comfort opening function is initiated by unlock¬ ing the vehicle with the remote control and keeping the button pressed forlongerthan 5 seconds. Initially, the front windows are opened, followed after a short time delay by the rear win¬ dows and the panorama glass roof. The signal from the remote control is picked up by the Car Access System 3 via the remote control receiver. The Car Access System 3 issues the enable to operate the powerwindows and initiates the comfort opening function. The footwell module and the junction box control unit cor¬ respondingly activate the powerwindow motors. With Remote Control The comfort closing function is initiated after locking the vehicle with the remote control and keeping the button pressed forlongerthan 5 seconds. Initially, the panorama glass roof is closed followed after a short time delay by the rear/front windows. If the folding exterior mirrors option is installed, the mirrors are folded in simultaneously as the rear windows are closed. Via the Driver's Door Lock Barrel There are two Hall sensors installed in the door lock forthe purpose of opening and clos¬ ing the vehicle. The Hall sensors enable the footwell module to detect the position of the mechanical key or of the spare key in the lock barrel. The key must be turned to the open or close position to initiate the comfort opening and closing function. The comfort opening or closing function is initiated when the key is held in this position. The footwell module sends the request via the K-CAN. On conclusion ofthe correspond¬ ing check, the Car Access System 3 initiates the comfort opening or closing procedure. With Comfort Ac cess In connection with Comfort Access, the comfort closing function is triggered via the dri¬ ver's/passenger's outside doorhandle. It is sufficient to touch the sensitive area ofthe outside door handle in orderto trigger the comfort closing function via the door handle. Comfort closing is triggered if the sensitive area is touched forlongerthan 5 seconds. The ID transmitter must be within an approximately 2 m radius ofthe vehicle. 12 E70 PowerWindows Anti-Trap Mechanism Essentially, the indirect anti-trap mechanism does not prevent an object being trapped but rather it limits the trapping force to maximum 80 N.The power window motor is reversed on exceeding this trapping force. Thefootwell module and the junction box control unit monitor the activated power win¬ dow motors. The indirect anti-trap mechanism forthe front windows is activated by the footwell module.The indirect anti-trap mechanism forthe rear windows is activated by the junction box control unit. The indirect anti-trap mechanism in the E90 is based on the evaluation of the Hall pulses from the power window motors. The speed is derived from the Hall pulses of the power window motors. Speed fluctuations within certain ranges triggerthe indirect anti-trap mechanism so that the windows are opened. Operation of the power window switches is ineffective while the windows are in the process of opening. If no operable anti-trap mechanism is detected as the result of defective Hall sensors, the window can only be operated in jolts. The power window is in emergency mode and must be reinitialized. A Check Control message will be displayed. Panic Mode Panic mode is triggered by overpulling - releasing- overpulling (overpulling = pulling beyond limit stop) the power window switches. It is necessary to release and overpull the switch again as the anti-trap mechanism is still active the first time the switch is overpulled. Overpulling the power window switch the second time within 4 seconds closes the win¬ dow with maximum force. Note: The indirect anti-trap mechanism is no longer active in this case. The window closes at the maximum closing force and does not reverse. 13 E70 PowerWindows Load Shut-Down,Terminal 50 To protect the battery, operation of the power windows is interrupted during the vehicle start procedure. The Car Access System 3 revokes the enable for power window operation in orderto interrupt current operation of the power windows. The signal is received by the footwell module and junction box control unit via the K-CAN. The power window switches must be pressed again following an interruption in opera¬ tion. The corresponding function is not executed if the power windows are operated dur¬ ing the start procedure. The enable for operation of the power windows is not issued until the start procedure has been completed. Thermal Protection The footwell module and the junction box control unit monitor the motor temperature. The motor temperature is determined based on the outside temperature, motor running time and the time the motor is stationary (not operative). Each motor can be switched off individually to prevent the power window motors over¬ heating during operation of the power windows). The motoris then deactivated fora defined period of time. The thermal protection facility does not prevent the windows being opened in the case of trapping. Once started, a powerwindow function is not inter¬ rupted by the thermal protection facility. In panic mode the window can still be closed even when the thermal protection function is active. 14 E70 PowerWindows Service Information Initialization The front and rear power windows can be initialized via the power window switches or the BMW diagnosis system. Via Window Switches The following procedure must be performed to initialize the system: • Completely close window by pulling the power window switch beyond the limit stop. • Briefly interrupt pulling the power window switch and then pull the switch upwards again for approximately. 1 second. Via the BMW Diagnosis Equipment The powerwindows can be initialized as part of an initialization job using the diagnosis system. A detailed description of the initialization procedure is provided in the BMW diagnosis system. Note: The powerwindows can only be moved in jolts if not initialized. 15 E70 Powerwindows