1 | Holder with air cushion |
2 | Driver seat lumbar support adjustment control unit |
3 | Driver seat lumbar support pneumatic pump |
4 | Driver seat lumbar support adjustment switch |
P91.10-4094-11
Overview:
This document contains information on:
General
Function requirements
Manual adjustment function
General
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. This adjusts the shape of the seat backrest padding with the aid of two air cushions in the backrest.
Function requirements
Circuit 15R ON or run-on active
No overvoltage or undervoltage
No on-board electrical system limp-home mode
Manual adjustment function
Adjustment is performed via the lumbar support adjustment switch of the respective seat. The lumbar support adjustment control unit of the respective seat reads in the status of the lumbar support adjustment switch. Then it actuates the corresponding inflation or deflation of the air cushions via the valves integrated in the control unit. For compressed-air supply, the lumbar support adjustment control unit actuates the lumbar support pneumatic pump.
After switching off circuit 15R, adjustment of the lumbar support is still possible for another 180 s (run-on time). If, during the run-on time, the circuits status or the door status is changed, the run-on time starts again.