Lumbar Adjustment Function - GF91.29-P-0008LF
Model 217, 222
Except Code 432 (Dynamic seats left and right)
Function requirements, general
- No overvoltage or undervoltage
- Circuit 15R or circuit 15 ON
The electronic ignition lock control unit sends the status of circuit 15 over the interior CAN to the driver seat control unit and the front passenger seat control unit.
Lumbar support adjustment
To achieve optimum support of the vertebral column, the backrests on the driver and front passenger seat are each equipped with a lumbar support unit.
The lumbar support unit consists of the following components:
- two air cushions
- lumbar support pneumatic pump for compressed air production
- lumbar support adjustment control unit for pneumatic control
Inflation and deflation of the air cushions is done using a menu in the COMAND controller unit or in the head unit.
The various functions can be selected using the Audio/COMAND control panel or the touchpad. The Audio/COMAND display shows all the settings.
The lumbar menu can be accessed by pressing the seat button or by going to the seat adjustments menu item in the vehicle menu. The Audio/COMAND operating unit or the touchpad sends the operation signals via the telematics CAN to the COMAND controller unit or the head unit. The COMAND controller unit or the head unit processes these signals, generates the corresponding image data and sends a switch-on request via the telematics CAN to the Audio/COMAND display. The image data is sent via the LVDS line or the HSVL line to the Audio/COMAND display. In addition, the COMAND controller unit or the head unit sends the adjustment requests via user interface CAN, electronic ignition lock control unit and interior CAN to the driver seat control unit or the front passenger seat control unit. The driver seat control unit or the front passenger seat control unit sends the request via the seat LIN to the corresponding lumbar support adjustment control unit.
The air supply required for inflating the air cushions is supplied by the lumbar support pneumatic pump. The respective lumbar support adjustment control unit actuates the corresponding lumbar support pneumatic pump directly.
Model 217
Except Code 432 (Dynamic seats left and right)
Model 222
with code 275 (Memory Package (driver's seat, steering column and mirror))
Except Code 432 (Dynamic seats left and right)
The lumbar support adjustment can be saved and called up again.
| Electrical function schematic, lumbar support adjustment | PE91.29-P-2055-97SEA | ||
| Overview of system components for electric seats | GF91.29-P-9992LF |