Table of Contents E70 Seats Subject Page Introduction .4 Seat Equipment Options .4 Second Row Seating .6 Third Row Seating .7 Basic/Sport Driver and Passenger Front Seats .8 Driver Seat Adjustments .12 Driver Seat Heating.13 Seat Heating Power Reduction .13 DriverSeat LumbarSupport.14 Driver Seat M emory Function.14 Front Passenger Seat Adjustment.17 Front Passenger Seat Heating .18 FrontPassengerSeatLumbarSupport .19 Front PassengerSeat M emory Function .19 Multifunction Driverand Passenger Seats .20 Seat Adjustments .24 Seat Heating.25 Quick Heating Area .25 Seat Heating Power Reduction.26 LumbarSupport Function .26 Seat Memory Function.26 Active Seat .27 Low Voltage.31 Active Seat Ventilation .32 Second Row Seats (Rear Seat).34 Rear Seat Heating w/out Automatic Rear-cabin Air Conditioning _34 Rear Seat Heating w/Automatic Rear-cabin Air Conditioning.37 Second Row Seat Locking .40 The Large Seat Section .40 The Small Seat Section .40 J unction-BoxECU .41 Third Row Seat .42 Seat-position recognition, US version.42 Service Information.43 Initial Print Date: 10/06 Revision Date: Subject Page Seats Model: E70 Production: From Start of Production ibjichwis After completion of this module you will be able to: • Describe the different seat options available on the E70 • Identify the different functions of the available seat options on the E70 3 E70 Seats Introduction Seat Equipment Options There is a comprehensive range of seat equipmentforthe E70. Essentially, there are three different seat models available. The seat models are: • Basic seat (NotforU.S. vehicles) • Sport seat option • M ultifunction seat (comfort seat) option. Semi-electric and electric versions of the basic seat are not offered in the U.S. An electric version of the sport seat is offered. The table below shows the different types of seat adjustmentforthe seat models. Basic seat/Sport seat Multifunction seat Semtelectnc (1 ^Electric (2) Electric { 1 y Base equipment spec (1 ytull full equipment spec (2) equipment spec (2) Variant example Variant example Varant example j KHF w Each has electric seat-height and backrest inclination adjustment. The seats can be expanded to include assorted electrical functions. These functions are listed in the table in the next page. 4 E70 Seats The front side airbag has been integrated in the backrest of the driver and front passen¬ ger seat. Note: Further information on the side airbag, seat-occupancy recognition and the belt tensioner can be found in the Product Information "Advanced Crash Safety ManagementE70". The multifunction seat can be ordered with the active-seat function. In contrast to the previous models, the seat cushion is moved no longer by electrohydraulic but rather by electro-pneumatic means. The advantage of electro-pneumatics lies in the fact that the overall weight of the seat is reduced.This in turn reduces fuel consumption and lowers damage to the environment by pollutants. 5 E70 Seats Second Row Seating The E70 is a five-seater in its standard equipment specification, two seats in the front (driver and Passenger) and three seats in the row just behind the front seats. This is refered to as second row seating (back seat). It offers the opportunity of folding down the backrest completely, thereby increasing the luggage-compartment volume.The backrest are divided into two parts, the ratio being 60/40. Front and Second Row Seating Note: Rear Seat heating can be ordered as an option. 6 E70 Seats Third Row Seating The Passenger seating capacity can be extended to seven by ordering the third row seat¬ ing option.The additional two seats are situated in the luggage compartment and can be folded down completely. This row of seats is refered to as third row seating or 5 +2 seat concept and are not equipped with seat heaters. However, an independent heating unit option is available just for the third row seats. Third Row Seats 7 E70 Seats Basic/Sport Driver and Passenger Front Seats Basic/Sport Driver and Passenger Front Seat w/ Memory function C ircuit Diagram 8 E70 Seats Basic/Sport Driver and Passenger Front Seat w/ Memory function Circuit Diagram Legend Index Explanation Index Explanation D Driver's seat 20 Motor for folding-mirror function, passenger side 2 M otor, seat-height adjustment 21 Potentiometer, memory position, front passen- gerside 3 M otor, longitudinal seat adjustment 22 Electrochromic door mirror, passenger side ill Motor, seat-inclination adjustment 23 Adjustment motors, door mirror, front passenger side 5 Motor, backrest-inclination adjustment 24 Front passengerseat 6 M otor, head-restraint height adjustment 25 Seat-adjustment switch, seat height 7 Seat-adjustment switch with memory buttons 26 Seat-adjustment switch, seat length 8 Seat module, driver side 27 Seat-adjustment switch, seat inclination 9 Switch block, driverdoor(SBFA) 28 Seat-adjustment switch, backrest inclination 10 Adjustment motors, door mirror .driver's side 29 Seat-adjustment switch, head restraint height 11 Electrochromic door mirror, driver side 30 M otor, head-rest height adjustment 12 Potentiometer, memory position, driver side 31 Motor, backrest-inclination adjustment 13 M otorforfolding-mirrorfunction, driverside 31 Motor, seat-inclination adjustment 14 Door-mirror heating, driver side 33 Motor, longitudinal seat adjustment 15 Door mirror, driverside 34 Motor, seat-height adjustment 16 Footwell module FRM K-CAN Body CAN 17 J unction-box ECU KL 30g Terminal 30g 18 Door mirror, front passenger side KL 58g Terminal 58g 19 Door-mirror heating, front passenger side LIN-Bus Local interconnect network bus In the case of an electric driver seat (1) not fitted with a lumbar support, the seat adjust¬ ment switches (7) are read in directly by the seat module (8). The seat-adjustment switches are resistance-coded. On an electric front passengerseat (24), the seat-adjustment switches (25 to 27) actuate the adjustment motors (30 to 34) directly. 9 E70 Seats Basic/Sport Driver Seat w/H eating, Memory and Lumbar Support Circuit Diagram 10 E70 Seats Basic/Sport, Driver Seat w/H eating, Memory and Lumbar Support Circuit Diagram Legend Index Explanation Index Explanation D Footwell module FRM 18 Motor, backrest-inclination adjustment 2 J unction-box ECU J B 19 Backrest heating 3 Door mirror, front passenger side 20 Seat-surface heating D Door-mirror heating, passenger side 21 Seat-adjustment switches, button for lumbar- support adjustment, memory buttons 5 Motorforfolding-mirrorfunction, passenger side 22 Switch block, driver door (SBFA) 6 Potentiometer, memory position,front passenger side 23 Adjustment motors, door mirror, driver side 7 Electrochromic door mirror, passenger side 24 Electrochromic door mirror, driver side 8 Adjustment motors, door mirror, front passenger side 25 Potentiometer, memory position, driver side 9 Integrated automatic heating/air conditioning IFiKA 26 Motorforfolding-mirrorfunction, driver side 10 Seat-heating button 27 Door-mirror heating, driver side 11 Seat module, driver side 28 Door mirror, driver side 12 Pump for lumbar-support adjustment K-CAN Body CAN 13 Solenoid valves for lumbar-support adjustment KL 30g Terminal 30g 14 M otor, seat-height adjustment KL 58g Terminal 58g 15 M otor, longitudinal seat adjustment S-Bus Seat bus (K-bus protocol) 16 Motor, seat-inclination adjustment LIN-Bus Local interconnect network bus 17 Motor, backrest-inclination adjustment Note: This system circuit diagram features the driver side, basic and sport electric seat, with memory, heating and lumbar support functions. The seat bus is installed only from the lumbar support between the seat- adjustment switches (21) and the seat module (11). The system circuit diagrams for the driver and front passenger side are shown separately. 11 E70 Seats Driver Seat Adjustments The electric basic seat or electric sport seat can be electrically adjusted in the following directions: • Seat height • Seat distance to steering wheel (longitudinal seat adjustment) • Seat inclination • Backrest inclination • Head-rest height The seats can be electrically adjusted from "Terminal 30g ON". Index Explanation Index Explanation 1 Lumbar-support adjustment 3 Seat-height adjustment 2 Seat-height adjustment 4 Memory buttons A seat module activates the driver seat. The seat-adjustment switches signal the seat module the desired adjustment. The switches supply a defined voltage corresponding to the request. Based on these voltage values, the seat module determines which motor it must activate. Activation takes place via the relay in the seat module until the seat-adjust¬ ment switch is released orthe end of the adjustment travel is reached. The Hall sensors in the adjustment motors supply Hall pulses, which are evaluated by the seat module. The seat position is determined based on these Hall pulses. This function is used not only to detect the end stops but also to store the memory posi¬ tion of the driver seat. 12 E70 Seats A locked up motor is detected by means of the current-measurement function integrated in the seat module. In this case, the relays are no longer actuated thus shutting down the motors. The memory setting forthis motor is inhibited until the motor is no longer locked. Note: In the case of lumbar support seats, the seat-adjustment switches are no longer read directly by the seat module, as with the semi-electric basic seats.This means that the seat module is now connected with the S bus (K-bus protocol) to the seat-adjustment switches. Driver Seat Heating As on the semi-electric basic seat, the seat heating has two heating circuits. Each of the heating circuits has a heating areaforthe backrest and the seat cushion. The driver seat has the driver seat module (SMFA). The function of the seat heating is integrated completely in the seat module. The driver seat module is connected to terminal 30g forthe load current. When the vehicle wakes up, the junction-box ECU determines whethera driver seat module is installed in the vehicle. The junction-box ECU sends a query via the K-CAN for this purpose. The driver seat module, which is connected via the K-CAN, responds via the K-CAN.The junction-box ECU now knows that a driverseat module is installed in the vehicle. However, the seat heating can only be activated from the status "Terminal 15 ON".The status "Terminal 15 ON" is made available by the Car Access System 3 via the K-CAN. The seat-heating button is located in the control panel forthe integrated automatic heat¬ ing/air conditioning. When the seat heating button is pressed, the integrated automatic heating/air conditioning sends the heating-stage request via the K-CAN. The driverseat module evaluates the requestforthe desired heating stage actuates the seat heating accordingly. The driverseat module determines the set temperature by means of the NTC resistor in the heating mat of the seat surface. A fault in the seat-heat¬ ing system results in a corresponding entry in the fault memory of the driverseat module. Seat Heating Power Reduction The junction-box ECU makes the information for power reduction available on the K- CAN.The driverseat module receives the information via the K-CAN.The driverseat module reduces the heat output in accordance with the request. 13 E70 Seats The Power Reduction Stages Are: • Operation of seat heating in Stage 2 only • Operation of seat heating in Stage 2 at only 50% • Seat heating OFF Note: In the event of a power reduction, the LEDs of the seat-heating switch are not switched off. Driver Seat Lumbar Support The button for lumbar-support adjustment is located on the front of the seat (facing the door). If the vehicle has lumbar support, the front passenger seat receives a seat module. The function of the lumbar support is integrated completely in the seat module. The seat module evaluates the button for lumbar-support adjustment. Lumbar support is provided by two inflatable air cushions in the backrest. Each air cushion is inflated or deflated via two solenoid valves. The pump for lumbar-support adjustment delivers the required air pressure. The pump and the solenoid valves are actuated by the seat module until the required lumbar sup¬ port is established. Note: In the case of seats with lumbarsupport, the buttons for seat adjustment are connected via the S - bus seat bus (K- bus protocol) to the seat mod¬ ule. This also applies to seats with a memory function. Driver Seat Memory Function The memory function on the basic or sport electric seat is only available forthe driver seat.The memory buttons are located on the side ofthe driver seat. The memory func¬ tion can be activated as from "Terminal R ON ".Two memory positions and the current seat position can be stored. By pressing the memory button "M" followed by pressing button "1" or "2", the current position ofthe driver seat is assigned to the pressed button. At the same time, the current position ofthe door mirrors is also assigned to the selected button. The information for storing the door mirror position is sent by the driver seat mod¬ ule via the K-CAN. Note: The memory position of the door mirrors is stored inthefootwell module. Within the framework of Personal Profile, the data is assigned to the current remote con¬ trol key when the memory position is stored. 14 E70 Seats Basic/Sport Front Passenger Seat w/Heating and Lumbar Support Circuit Diagram 16 E70 Seats Basic/S port Front Passenger Seat w/Heating and Lumbar Support Circuit Diagram Legend Index Explanation Index Explanation B Integrated automatic heating/air conditioning IHKA 10 Motor, longitudinal seat adjustment 2 Seat-heating button 11 Motor, seat-height adjustment 3 J unction-box ECU (J B) 12 Solenoid valves for lumbar-support adjustment B Seat-adjustment switches, button for lumbar¬ support adjustment, memory buttons 13 Pump for lumbar-support adjustment 5 Seat-surface heating 14 Driver's seat module (SM BF) 6 Backrest heating K-CAN Body CAN 7 M otor, head-restraint height adjustment KL 30g Terminal 30g 8 Motor, backrest-inclination adjustment S-Bus Seat bus (K-bus protocol) 9 Motor, seat-inclination adjustment This circuit diagram features basic and sport, front passenger side seat, with seat heating and lumbarsupport. The seat bus is installed only from the lumbarsupport between the seat-adjustment switches (5) and the seat module (15). In the case of seats not equipped with lumbar support, the seat-adjustment switches signal the seat module directly. The seat adjust¬ ment switches are resistance-coded. Front Passenger Seat Adjustment The basic and sport seat can be electrically adjusted in the following directions: • Seat height • Seat distance to steering wheel (longitudinal seat adjustment) • Seat inclination • Backrest inclination • Head-rest height The seats can be electrically adjusted from "Terminal 30g ON". 17 E70 Seats The front passenger side has a seat adjustment switch, from which the motors are direct¬ ly activated. Activation takes place until the seat-adjustment switch is released or the end of the adjustment travel is reached. The position of the front passengerseat is not stored and cannot be called up via Personal Profile. Index Explanation Index Explanation 1 Seat-backrest and head-restraint height adjustment 2 Longitudinal seat, seat-height and seat-inclination adjust The seat-adjustment switches are connected directly to the power supply. Thus the seat- adjustment switches actuate the adjustment motors directly. The switches forthe backrest and head rest can be moved in four directions. The switch forthe seat position can be moved in the following directions: • Seat forward or back, longitudinal seat adjustment • Seat high or low, seat-height adjustment • Seat inclination up or down (turn seat adjustment switch) Front Passenger Seat Heating As on the semi-electric basic seat, the front passenger seat heating has two heating cir¬ cuits. Each of the heating circuits has a heating area forthe backrest and the seat cush¬ ion. However, the front passengerseat has a seat-heating seat module. 18 E70 Seats Front Passenger Seat Lumbar Support If the front passenger seat features lumbar adjustment, it requires a seat module. The complete function is integrated in the seat module. The signals from the seat-adjustment switches and from the button for lumbar r support adjustment are interpreted by the seat module. The function is described in the section dealing with the basic and sport electric seat (driver's side). Front Passenger Seat Memory Function If the front passenger seat is equipped with a memory function, it requires a seat module. The signals from the seat-adjustment switches and from the button for lumbar support adjustment are received by the seat module via the S bus. The memory positions are stored in the front passenger seat module 19 E70 Seats Multifunction Driver and Passenger Seats Multifunction DriverSeat, Circuit Diagram 20 E70 Seats Multifunction Driver Seat Diagram Legend Index Explanation Index Explanation D Driver's seat module (SM FA) 17 Motorforfolding-mirrorfunction, door mirror, front passenger side 2 M otor, seat-height adjustment 18 Potentiometerfor door-mirror position memory, passenger side 3 Motor, longitudinal seat adjustment 19 Electrochromic door mirror, passenger side D Motor, seat-inclination adjustment 20 Adjustment motors, door mirror, front passen- gerside 5 Motor, backrest-inclination adjustment 21 Switch block, driverside (SBFA) 6 Motor, backrest-head adjustment 22 Adjustment motors, door mirror, driver side 7 M otor, head-restraint height adjustment 23 Electrochromic door mirror, driverside 8 Motor, seat-depth adjustment 24 Potentiometerfor door mirror position memory, driverside 9 Motor, backrest-width adjustment 25 Motorforfolding-mirrorfunction, door mirror, driverside 10 Solenoid valves for lumbar-support adjustment 26 Door-mirror heating, driverside 11 Pump for lumbar-support adjustment 27 Door mirror, driverside 12 Control buttons, seat adjustment K-CAN Body CAN 13 Footwell module FRM KL 30g Terminal 30 switched 14 J unction-box ECU (J B) KL 58g Terminal 58 switched 15 Door mirror, front passenger side S-Bus Seat bus (K-bus protocol) 16 Door-mirror heating, passenger side LIN-Bus Local interconnect network bus The multifunction seat can be ordered with the following options: • Seat heating • Active seat • Active seat ventilation 21 E70 Seats Multifunction Front Passenger Seat C ircuit Diagram 22 E70 Seats Multifunction FrontPassengerSeatCircuitDiagram Legend Index Explanation Index Explanation D Control buttons, seat adjustment 8 Motor, backrest-head adjustment 2 Pump for lumbar-support adjustment 9 Motor, backrest-inclination adjustment 3 Solenoid valves for lumbar-support adjustment 10 Motor, seat-inclination adjustment D Driver's seat module (SM FA) 11 Motor, longitudinal seat adjustment 5 Motor, backrest-width adjustment 12 M otor, seat-height adjustment 6 Motor, seat-depth adjustment KL 30g Terminal 30g 7 Motor, head-rest height adjustment S-Bus Seat bus (K-bus protocol) The multifunction seat can be ordered with the following options: • Seat heating • Active seat (European vehicles only) • Active seat ventilation Note: In US vehicles the front passenger seat has seat-occupancy recogni¬ tion. Forthis reason, a US version of the active seat cannot be offered forthe front passengerside. 23 E70 Seats Seat Adjustments The multifunction seat option contains the memory function forthe driver and front pas¬ senger seats. Multifunction seats can be electrically adjusted in the following directions: • Seat height • Seat distance to steering wheel (longitudinal seat adjustment) • Seat inclination • Backrest inclination • Head rest height • Backrest-head inclination • Seat depth • Backrest width Each multifunction seat has a seat module. All the seat-adjustment buttons are evaluated by the seat module. The buttons are connected via the S bus (seat bus on the basis of the K-bus protocol) to the seat module. The seat module is responsible forthe seat functions. It controls and monitors the func¬ tion sequences. Seat adjustment is possible as from "Terminal 30g ON". When the seat adjustment switches are operated, the seat module operates the motors to move the seat in the desired direction. The seat is moved by the motors until such the seat-adjust ment switch is released orthe seat reaches its adjustment limit. 1) 2) f3) The seat positions are stored in the seat module.The seat module receives the signal from the backrest-width but¬ ton via the S bus. After it has been operated, the backrest-width switch always returns to its initial position. It is integrated in the side panel of the seat. (V CD Index Explanation Index Explanation 1 Button for lumbar-support adjustment 5 Articulating backrest adjustment 2 Backrest-width adjustment button 6 Longitudinal seat, seat-height and seat-inclination adjustment 3 Backrest- inclination and headrest height adjustment 7 Seat-depth adjustment 4 Memory function 24 E70 Seats Seat Heating The seat heating forthe multifunction seat has four heating circuits. Each comprises one quick heating area and one residual heating area for backrest and seat cushion. Each heating area is provided with a temperature sensor. A maximum of two heating circuits are switched on simultaneously. The seat heating function is integrated completely in the seat module. The seat module is connected to terminal 30g forthe load current. When the vehicle wakes up, the junction-box ECU determines which seat module is installed in the vehicle. The junction-box ECU sends a query via the K-CAN forthis pur¬ pose. The driver and front passenger seat modules respond via the K-CAN. The junction-box ECU must registera response with in 200 ms.The junction-box ECU now knows that a driver seat module or a front passenger seat module is installed in the vehicle. However, the seat heating can only be activated from the status "Terminal 15 ON".The status "Terminal 15 ON" is made available by the Car Access System 3 via the K-CAN. The seat-heating button is located in the control panel forthe integrated automatic heat¬ ing/airconditioning (IHKA). When the seat heating button is pressed, the IHKA sends the heating-stage request via the K-CAN. 1 J (2 i The driver seat module evaluates the request forthe desired heating stage and operates the seat heating accord- ( ingly. The driver seat module deter¬ mines the set temperature by means of the NTC resistor in the heating mat of the seat surface. A fault in the seat¬ heating system results in a corre¬ sponding entry in the fault memory of the driver seat module. Quick Heating Area When the seat heating is switched on, the quick heating areas are activated first in orderto warm the seats up quickly. Afterthe initial quick warm-up, the residual heating areas are switched on in orderto ensure uniform temperature distribution in the seat. Activation of all the heating areas is clocked so that a defined current intensity is not exceeded during residual heating. The duty cycle is dependent on the selected heating stage, the switch-on period and the heating area temperature. Index Explanation 1 Seat-heating button, driverseat 2 Seat-heating button, front passengerseat 25 E70 Seats Seat Heating Power Reduction The junction-box ECU makes the information for power reduction available on the K-CAN.The driver seat module and front passenger seat module receive the information via the K-CAN.The seat modules reduce the heat output in response to the request. The reduction stages were described in a previous section. Lumbar Support Function The lumbar support function is integrated completely in the seat module. The seat mod¬ ule evaluates the button for lumbar support adjustment. Lumbar support is provided by two inflatable air cushions in the backrest. Each air cush¬ ion is inflated or deflated via two solenoid valves. The pump and the solenoid valves for lumbar-support adjustment are actuated by the seat module until the required lumbar support is established to the desired level of com¬ fort . Seat Memory Function The memory function on the multifunction seat is available for the driver and front pas¬ senger seats only. The memory buttons are located on the sides of the seats. The memory function can be activated as from the status "Terminal R ON". Two memory positions and the current seat position can be stored by pressing the memory button "M" followed by pressing button "1" or "2", thus current position of the seat is assigned to the button. At the same time, the current position of the door mirrors is also assigned to the selected button. The information for storing the door mirror position is sent by the driver seat mod¬ ule via the K-CAN. Note: The memory position of the door mirrors is stored in the footwell module. Within the framework of Personal Profile, the data is assigned to the current remote con¬ trol key when the memory position is stored. 26 E70 Seats The full equipment specification of the multifunction seat contains the following options: • Active seat (US version) • Active seat ventilation The functions of the front passenger seats are identical to those of the driver seat. However, the front passenger seat does not contain the door-mirror memory function. Note:The US version of the front passengerseat has seat-occupancy recognition. For this reason, a US version of the active seat cannot be offered forthe front passengerseat. Active Seat The active seat is switched on by the button in the center-console switch center. The function operates when "Terminal 15 ON". The integrated automatic heating/air conditioning receives the signal from the center- console switch center and sends it via the K-CAN.The seat module thus receives the request and executes it. This function is derived from the E60. However, the active seat has a pneumatic sys- tem.The system uses the pump for lumbar-support adjustmentto deliverthe required amount of air into the seat cushion. Note: Lumbar-support adjustment has priority over the Active Seat. The pump runs at maximum speed forthe active-seat function and the pump for lumbar support adjustment runs at roughly half that speed. Note: Lumbar-support adjustment has priority overthe active seat. For Lumbar S upport adjustment, the pump runs at maximum speed. Forthe active- seat function, the pump for lumbar support adjustment runs at roughly half this speed 27 E70 Seats Multifunction Seat w/Active Seat and Active Seat Ventilation Circuit Diagram 28 E70 Seats Multifunction Seat w/Active Seat and Active Seat Ventilation Circuit Diagram Legend Index Explanation Index Explanation D Driver's seat module (S M FA) 22 Control buttons, seat adjustment 2 M otor, seat-height adjustment 23 Footwell module FRM 3 Active-seat button 24 J unction-box ECU (J B) SI Center-console switch centerSZM 25 Door mirror, front passenger side 5 Button, seat heating and active seat ventilation 26 Door-mirror heating, passengerside Integrated automatic heating/air conditioning 27 Motorforfolding-mirrorfunction, door mirror, IHKA front passengerside 7 Motor, longitudinal seat adjustment 28 Potentiometerfor door-mirror position memory, passengerside 8 Motor, seat-inclination adjustment 29 Electrochromic door mirror, passengerside 9 Motor, backrest-inclination adjustment 30 Adjustment motors, door mirror, front passengerside 10 Motor, backrest-head adjustment 31 Switch block, driverside (SBFA) 11 M otor, head-restraint height adjustment 32 Adjustment motors, door mirror, driver side 12 Motor, seat-depth adjustment 33 Electrochromic door mirror, driverside 13 Motor, backrest-width adjustment 34 Potentiometerfor door-mirror position memory, driverside 14 Motors, active seat ventilation, seat surface 35 M otorforfolding-mirrorfunction, door mirror, driverside 15 Motors, active seat ventilation, backrest surface 36 Door-mirror heating, driverside 16 Pump for lumbar-support adjustment/active seat 37 Door mirror, driver side 17 Solenoid valve, changeover, lumbar-support adjustment/active seat K-CAN Body CAN 18 Solenoid valve, lumbar-support adjustment KL 30g Terminal 30g 19 Distributor module, active seat KL 58g Terminal 58g 20 Seat-surface heating S-Bus Seat bus (K-bus protocol) 21 Backrest heating LIN-Bus Local interconnect network bus 29 E70 Seats Active Seat Overview Index Explanation Index Explanation 1 Lower seat cushion, left 8 Integrated automatic heating/air conditioning IHKA 2 Upperseat cushion, left 9 Center-console switch center (SZM) 3 Upperseatcushion, right 10 Active-seat button, driver side 4 Lower seat cushion, right 11 Driver's seat module 5 Output, lumbar-support adjustment 12 Distributor module, active seat 6 Solenoid valve, changeover, active seat/lumbar-support adjustment 13 Air supply, active seat 30 E70 Seats Four air cushions are integrated in the seat surface forthe active seat. Two air cushions, one on top of the other, are used in both the left and right seat halves. The air cushions are inflated with air provided by the pump for lumbar-support adjust¬ ment. A solenoid valve is integrated in the pump unit. The function of the solenoid valve is to change overthe air supply. This ensures that only one function (lumbar-support adjustment or active seat) is ever executed. A distributor module is used for inflating the air cushions. The seat module delivers power to the distributor module as soon as the active seat is switched on. The distributor module houses a motor, which drives an eccentric shaft. The rotation of the eccentric shaft causes the air inlets to the seat cushions to open or close. The seat cushions are alternately inflated or deflated, depending on the position of the eccentric shaft. The air inlets are closed when the system is switched off and in the breaks between inflation or deflation. A switch contact is integrated in the distributor module to switch on the pump for lumbar support adjustment. The rotation of the eccentric shaft actuates the contact, which there¬ by signals activation to the seat module. The seat module switches on the pump for lum¬ bar-support adjustment and changes the solenoid valve to inflate the seat cushions. Low Voltage If the function fails due to low voltage when the active seat is switched on, the active seat must be calibrated. The function does this by itself. The seat cushions are completely deflated the next time the active seat is switched on. The active seat function is then ready for operation again. In the event of a fault, the system shuts down or stop in the next center position in order to avoid further damage. In the interest of avoiding irritation when cornering at high speed, the active-seat function is stopped immediately in the event of excessive lateral acceleration. The lateral-acceleration signal comes from the yaw-rate sensor. Dynamic Stability Control evaluates the signals from the yaw-rate sensor and sends them via the PT-CAN. The junction-box ECU makes the signals available on the K-CAN. In this way, the seat module receives the signal forthe vehicle's lateral acceleration. Activation of the active seat is reversed by the seat module from a defined threshold. The active seat is switched on again when the lateral-acceleration value drops again. 31 E70 Seats Active Seat Ventilation The active seat ventilation option allows the occupants to cool the seat surfaces and backrest individually. Active seat ventilation is available for both driver and front passenger seats. Active seat ventilation can be activated as from the status "Terminal 15 ON". Stage 3 is engaged when the button is pressed forthe first time. This means a high fan stage for seat and backrest. By pressing the button a second and third time lower stages of cooling are achieved. By pressing the button a even further will shut OFF the system. Active seat ventilation is deactivated if the button remains pressed for longer than 1.2 Index Explanation Index Explanation 1 Seat-heating button, driverseat 3 Button, active seat ventilation, front passengerseat 2 Button, active seat ventilation, driver's seat 4 Seat-heating button,front passengerseat Pressing the button results in a menu being brought up in the Central Information Display. The individual air-conditioning stages can be selected from this menu, for exam¬ ple when the button is pressed again. An LED on the button indicates when active seat ventilation is switched on. The integrated automatic heating/air conditioning evaluates the signals for operating active seat ventilation. The request is sent via the K-CAN.The seat module thus receives the request and executes it. The seat module activates and monitors the fans. Nine fans are accommodated in each seat. The fans are switched on by the seat module and activated separately for backrest and seat surface. For active ventilation, the seat has two speed stages forthe fans, depending on the air-conditioning stage. The seat surface has five fans, while the backrest has four fans. 32 E70 Seats After having been activated fora period in excess of 15 minutes, active seat ventilation is automatically switched back from Stage 3 to Stage 2. The function of activated seat ventilation remains stored for up to 15 minutes afterthe status "Terminal 15 OFF". Active seat ventilation is switched on again if in this time the status "Terminal 15 ON" is received by the seat module. The energy management system in the vehicle can deactivate active seat ventilation briefly depending on the vehicle's energy balance. The function indicator is retained however. Fan Stages: A/C stage Fans, seat Fans, backrest 3 High High 2 High Low 1 Low Low 0 OFF OFF 33 E70 Seats Second Row Seats (Rear Seat) The Seat heating option is also available for second row seats. Seat heating is an option The seat heating option cannot be ordered individually.This means that it can only be ordered in conjunction with the Front Seat-heating option. Seat heating forthe second row is available in two equipment specifications: • Rear Seat heating without automatic rear-cabin air conditioning • Rear Seat heating with automatic rear-cabin air conditioning Rear Seat Heating w/out Automatic Rear-cabin Air Conditioning The seat heating features two heating circuits each in the right and left seat halves. Each ofthe heating circuits has a heating area forthe backrest and the seat cushion. The seat heating is connected to the "Terminal 15" relay.The seat heating can therefore only be activated from "Terminal 15 ON".The seat heating can be switched on individually forthe left or right seat half with buttons. The seat-heating buttons are integrat¬ ed underthe air vents in the rear cen¬ ter console. 2 Index Explanation Index Explanation 1 Seat-heating button, driver's side, rear 2 Seat-heating button,front passengerside, rear The seat heating can be switched on in two heating stages.The heating stages and their indications are set out in the following table.The seat heating is controlled by means of an NTC resistor in the heating mat ofthe seat surface. The buttons are resistance-coded and make a different supply voltage available forthe seat heating. Heating stage Seat Backrest LED 2 Normal Normal 2 1 Low Low 1 0 OFF OFF OFF 34 E70 Seats Rear Seat Heating w/out Automatic Rear-cabin AirConditioning Circuit Diagram 36 E70 Seats Rear Seat Heating w/out Automatic Rear-cabin AirConditioning Circuit Diagram Legend Index Explanation Index Explanation 1 Seat-heating button, driver side, with function indicator 6 Terminal 30 (distribution box, front) 2 Seat-heating button, front passenger side, with function indicator 7 Terminal 15 ON (switched byCAS3) 3 Seat heating, seat surface, front passenger side 8 Seat heating, backrest, driver side 4 Seat heating, backrest, front passengerside 9 Seat heating, seat surface, driver side 5 Relay, terminal 15 KL 58g Terminal 58 switched Note: The Car Access System 3 actuates a relay in the front distribution box. The front distribution box is thus supplied with "Terminal 15 ON" (7). The Terminal 15 relay (5) among others is connected to this supply. Rear Seat Heating w/Automatic Rear-cabin AirConditioning The seat heating has two heating circuits, as described above. It does, however, have a seat-heating seat module. The function of the seat heating is integrated completely in the seat-heating seat module. The seat-heating seat module is connected to terminal 30 forthe load current. The seat heating can be activated from the status "Terminal 15 ON". Automatic rear cabin air conditioning receives the status "Terminal 15 ON" via the K-CAN. The buttons for operating the seat heating are integrated in the control panel for automat¬ ic rear-cabin air conditioning. The automatic rear-cabin air conditioning ECU evaluates the buttons and activates the seat heating depending on the selected heating stage. The seat-heating seat module is supplied with a pulse-width-modulated signal forthis purpose.The pulse width corresponds to the required heating stage. The seat-heating seat module executes the request and monitors the seat heating. The seat-heating seat module determines the set temperature by means of an NTC resistor in the heating mat of the seat surface. 37 E70 Seats Rear Seat Heating w/Automatic Rear-cabin Air Conditioning Circuit Diagram D fin r — 8J p-"- SMSH SMSH 4 I Kl 15 •—f xi —• Kl 15 Jl 38 E70 Seats Rear Seat Heating w/Automatic Rear-cabin Air Conditioning Circuit Diagram Legend Index Explanation Index Explanation 1 Seat-heating button, driverside, with function indicator, rear 7 Seat-heating seat module, driver side, rear 2 Automatic rear-cabin air conditioning 8 Seat heating, backrest, driverside 3 Seat-heating button, front passenger side, with function indicator, rear 9 Seat heating, seat surface, driver side 4 Seat heating, seat surface, front passenger side KL 30g Terminal 30 switched 5 Seat heating, backrest, front passengerside KL 15 Terminal 15 (distribution box, front) 6 Seat-heating seat module, front passengerside, rear SeatHeating Buttons W/RearlHKA. 1 ) 2 Index Explanation Index Explanation 1 Seat-heating button, driverside 2 Seat-heating button, front passengerside The seat heating can be switched on in three heating stages. The heating stages and their indications are set out in the following table. Heating stage Seat Backrest LED 3 High High 3 2 Normal Normal 2 1 Low Low 1 0 OFF OFF OFF 39 E70 Seats Second Row Seat Locking The locking function of the seat bench in the second seat row is monitored. For example, a locked seat bench ensures that it cannot come loose during driving and result in passenger injuries. The second row seats are divided into a large and a small seat sections. The ratio is 60- 40.Therefore, the large seat portion has four M icros-witches while the small seat portion has one M icro-switch for monitoring the lock. The junction-box ECU issues a signal as soon as the contact to the ground connection is interrupted. The signal alerts the customerthatthe second row is not locked correctly. The Large Seat Section M icros-witches are installed forthe backrest and seat surface for monitoring the large seat section. On the backrest there is only one M icro-switch, on the outside. There are two further M icros-witches in the seat bottom, on the inside and outside of the locks. Another M icro-switch is located on the seat-cushion arm in the seat bottom to detect when the backrest is in the fully set-down in position and locked. All the switches are closed when the seat section is correctly locked. One of the switches of a locked seat is always open or closed. The following seat states are monitored: • Large seat half, backrest, folded up and locked • Large seat half, backrest, folded down • Large seat half, seat surface tilted • Large seat half, seat surface locked The Small SeatSection The small seat section is monitored by a M icro-switch, since there is no belt integrated in the backrest. The Micro-switch is situated on the mechanical lock on the inside of the seat bottom. The switch is closed when this seat is correctly locked. Index Explanation 1 M icro-switch, seat (40 % seat, lock on seat bottom) 2 M icro-switch, large seat half (60% lock, seat, inner) 3 M icro-switch, large seat half (60% lock, outer) 4 M icro-switch, large seat half (60% backrest, outer) 5 M icro-switch, large seat half (60% seat-cushion arm, inner) 40 E70 Seats Seat Position/Backrest Position & \*) 0 Seat position, second seat row completely locked Large seat half, seat bench tilted (also called Easy Entry) Large seat half, backrest, folded down, not locked Large seat half, backrest, folded down Index Explanation Index Explanation 1 J unction-box ECU (J B) 5 M icro-switch, large seat half (backrest, outer) 2 M icro-switch, small seat half (40%) 6 M icro-switch, large seat half (seat cushion arm) 3 34 M icro-switches, large seat half (seat, inner/outer) 7 Seat position/backrest position J unction-Box ECU The junction-box ECU is the monitoring electronic control unit. In the event of an incor¬ rectly locked seat, the junction-box ECU no longer has ground contact with this pin. The signal level therefore changes from Low to High.The junction-box ECU issues a check control message and alerts the driverto an unlocked seat. 41 E70 Seats Third Row Seat The seat concept described above can be extended by the 5+2 seat concept. This is available as the 5+2 seat-extension option. The additional two seats are situated in the luggage compartment and can be folded down completely. This seat row is the third row in the E70. These seats are not equipped with seat heating. However, an independent heating option is available forthe third row. More information can be found in the Product Information "E70 Heating / AirConditioning". Seat-position recognition, US version The US version of the driver seat has seat position recognition. Seat-position recognition indicates where longitudinally the seat is situated (distance to the steering wheel). In this way, the distance between the driver and the steering wheel can be detected. The ACSM requires this information so that it can fire the airbag under defined condi¬ tions. A more detailed description can be found in the Product Information "E70 Advanced Crash Safety Management". Seat-position recognition is calibrated at the factory. The positions in the front and rear longitudinal seat direction are known to the seat module. A maximum distance is available for longitudinal seat adjustment. This stretches from the mechanical front stop to the mechanical rear stop. The motorfor adjustment in the longitudinal direction generates Hall pulses overthis distance. The seat modules uses these Hall pulses to identify the current (absolute) seat position. An area for example in which a person of short stature would sit is defined in the longitu¬ dinal direction. The absolute seat position can be lost due to specific causes. The seat must therefore be calibrated. Please referto the Service Information. 42 E70 Seats Service Information Calibration of US-Version Driver Seat The position ofthe driver seat in the longitudinal direction can become implausible in the course of that seat's life. This can be caused by repeatedly moving the seat forward and back in the longitudinal direction. These movements can give rise to an unauthorized position delta which no longer pro¬ vides fora determination ofthe seat position. The seat must therefore be recalibrated. Calibration is easy and can be performed by the customer him-/herself. Please referto the Owner's Handbook. Note: The seat must be moved in the mechanical front stop. Then the seat is calibrated and can be adjusted in the desired seat position. If the seat is unable to reach the mechanical front stop, the calibration must be per¬ formed in the service garage/workshop. This situation can come about if, a coin is stuck in the seat-adjustment rail and blocks the adjustment travel. When repairs are made to the seat, the seat must always be calibrated. This is necessary to guarantee seat-position recognition, or more precisely to increase the safe and reliable function of seat-position recognition. Switching the seat ECU fortest purposes for example with one from anothervehicle is possible. The seat calibration will be lost however. Because the possibility ofthe calibra¬ tion being in orderwhen the old seat ECU is reinstalled cannot be ruled out, it is neces¬ sary to calibrate the seat. Referto the repair instructions for seat calibration. Index Explanation 1 Relative seat position 2 Absolute seat position 3 5% woman area Blue arrow 5% woman area Red arrow Seat-adjustment travel (5% woman) 43 E70 Seats Note: The ACSM receives from the seat ECU via the K-CAN a message once a second as to whether calibration of the seat is necessary. As soon as the message contains the information "Calibrating necessary", the ACSM outputs a check control message via the K-CAN to the instrument cluster. The seat ECU can likewise triggerthe check control message.This is possible if for instance the Hall sensor of the longitudinal drive motor is defective. A repair in the garage/ workshop will therefore be necessary. The seat must be calibrated after the repair. Check Control Message Meaning Information in Central Information Display Seat must be recalibrated. Seat calibration necessary. Seat-position recognition mal¬ functioning! Seat-position recognition mal¬ functioning! Have the system checked by BMW Service at the next available opportunity. Rear seat not locked! Rear seat/Backrest Left or right rear seat not locked. Increased risk of injury in the event of an impact because seat belt is ineffective! 44 E70 Seats