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

MODEL 204.0 /2 with CODE (409) Left/right front multicontour seats as of model year 2009 /YoM 08

MODEL 204.3 with CODE (409) Left/right front multicontour seats

MODEL 204.9 with CODE (409) Left/right front multicontour seats

Fig 1: Multicontour Seat Function Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements, general

Circuit 15 or circuit 15R ON
No overvoltage or undervoltage
No damage to the compressed air supply

Multicontour seat (MKS), general

The multicontour seat can be adjusted individually.

The individual adjustment of the contour and the surface hardness of the backrest and of the seat cushion is made possible by filling and purging.

The air cushions are located as follows:

in the backrest area at the left and right,
in the upper lumbar area,
in the lower lumbar area and
in the front upper leg area of the seat cushion.

Lumbar support = curvature of spine in lumbar region.

The multicontour seat pneumatic pump is supplied with voltage by the rear SAM control unit.

The inflating and deflating of the individual air cushions is controlled manually via the:

Control valve for seat cushion fore/aft adjustment
Control valve for lower lumbar support adjustment
Control valve for upper lumbar support adjustment
Control valve for side bolsters adjustment located in the:
Control valve block for multicontour seat

The multicontour seat enables the following subfunctions to be performed:

Function sequence for adjusting the seat cushion length
Function sequence for adjusting the lower lumbar area
Function sequence for adjusting the upper lumbar area
Function sequence for adjusting the lateral support

Function sequence for adjusting the seat cushion length

The front area of the multicontour seat cushion is adjusted using the control valve for seat cushion fore/aft adjustment.

When actuating the control valve for seat cushion fore/aft adjustment in the (+) or (-) direction, the seat cushion contour changes in the upper leg area by inflating or deflating the air cushion.

Function sequence for adjusting the lower lumbar area

The lower lumbar support area of the multicontour backrest is adjusted using the control valve for lower lumbar support adjustment.

When actuating the control valve for lower lumbar support adjustment in the (+) or (-) direction, the backrest contour changes in the lower lumbar support area by inflating or deflating the air cushion.

Function sequence for adjusting the upper lumbar area

The air cushion in the upper lumbar support area of the multicontour backrest is adjusted with the control valve for upper lumbar support adjustment.

When actuating the control valve for upper lumbar support adjustment in the (+) or (-) direction, the backrest contour changes in the upper lumbar support area by inflating or deflating the air cushion.

Function sequence for adjusting the lateral support

The lateral support of the multicontour backrest is adjusted using the control valve for side bolsters adjustment.

When actuating the control valve for side bolsters adjustment in the (+) or (-) direction, the air cushions of the left and right side bolsters of the multicontour backrest are inflated or deflated.

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