Multicontour seat (MCS), function - GF91.25-P-0001CA

MODEL 207.3/4 with CODE 409 (Left/right front multicontour seat)

Fig 1: Multicontour Seat Block Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements, general

Circuit 15 or circuit 15R ON
No overvoltage or undervoltage

The electronic ignition lock control unit sends the status of circuit 15 via the interior CAN to the rear SAM control unit.

Function description of multicontour seat, general

The contour and surface hardness of the backrest and the seat cushion of the driver and front passenger seat can be changed individually. This is done by air cushions that can be inflated independently of each other.

The air cushions are installed in the following areas:

Lumbar area at bottom
Lumbar area at top
Side bolsters of backrest
Front area of seat cushion (seat cushion length) (except with code (494) USA version, passenger side)

Function sequence for adjustment of multicontour seat

The adjustment of the contour and surface hardness of the backrest and the seat cushion of the driver or front passenger seat is performed by inflating and deflating the respective air cushion. By switching on circuit 15R or circuit 15, the multicontour seat pneumatic pump is supplied with voltage. The multicontour seat pneumatic pump ensures the compressed air supply for inflating the individual air cushions. If the maximum pressure is reached in the air cushion when inflating, the multicontour seat pneumatic pump switches itself off.

By turning the corresponding regulation valve in the multicontour seat regulation valve block, the individual air cushions can be filled or emptied independent of one another.

	Electrical function schematic for multicontour seat		PE91.25-P-2051-97EAA
	Overview of system components, electric seats		GF91.29-P-9992CA