Lumbar Adjustment Function - GF91.29-P-0008RF
Model 205, 253
with code 221 (Electrically adjustable left driver seat)
with code 222 (Electrically adjustable right driver seat)
except code 409 (Left and right front multicontour seat)
Model 205, 253
with code 242 (Front passenger seat, electrically adjustable with memory function)
except code 409 (Left and right front multicontour seat)
Model 205, 253
with code 275 (Memory Package (driver's seat, steering column and mirror))
except code 409 (Left and right front multicontour seat)
Model 205, 253
with code P65 (Seat comfort package)
except code 409 (Left and right front multicontour seat)
Function requirements, general
- Circuit 15R ON or run-on active
- No on-board electrical system limp-home mode
- No overvoltage or undervoltage
If circuit 15R is switched off, the lumbar support can still be set for t = 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.
Lumbar support adjustment, 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.
The lumbar support unit consists of the following components:
- Two air cushions
- Lumbar support pneumatic pump
- Lumbar support adjustment control unit
Function sequence for lumbar support adjustment
Setting is performed via the lumbar support adjustment switch. The lumbar support adjustment control unit reads in actuation of the lumbar support adjustment switch directly. The lumbar support adjustment control unit controls the corresponding inflation or deflation of the air cushions via integrated valves. For compressed-air supply, the lumbar support adjustment control unit actuates the lumbar support pneumatic pump directly.
| Electrical function schematic, lumbar support adjustment | PE91.29-P-2055-97FBA | ||
| Overview of system components for electric seats | GF91.29-P-9992RF |