Multicontour Seat Control Unit (MCS), Component Description - GF91.25-P-5201FR

Model 257, 290 up to Model year 2021 with code 432 (Dynamic seats left and right) 

Shown on driver seat 

Location 

The multicontour seat control unit is located in the backrest frame of the respective seat.

Tasks 

The multicontour seat control unit does the following:

• Inflating and deflating the multicontour backrests
• Controlling of the massage function
• Controlling of the dynamic function
• Adjustment of stored pressure values when calling up the memory function and storage of contours (with code 275 (Memory package))
• Shutoff of the respective function if the pressure valve responsible has overheated

The tasks are subdivided as follows:

• Reading in of sensors and signals 
• Evaluation of input factors 
• Actuation of components 
• Transmitting signals 

Reading in of sensors and signals 

The following signals, among others, are read in via interior CAN (CAN B):

• Air cushion adjustment request
• Massage function request
• Dynamic function request
• Store/move to memory position request (with code 275 (Memory package))
• PRE-SAFE® adjustment request

Evaluation of input factors 

The input factors read in are evaluated by the multicontour seat control unit. The air cushions in the seat's contour insert are actuated through piezo valves that are integrated in the multicontour seat control unit.

Actuation of components 

The air supply for the air cushions in the seat's contour insert occurs through piezo valves integrated in the multicontour seat control unit. The multicontour seat control unit directly actuates the integrated piezo valves internally.

Transmitting signals 

The multicontour seat control unit sends signals over the following connections:

• Massage components LIN (LIN B26) 
• Interior CAN 

Massage components LIN 

The multicontour seat control unit sends the request for the massage function via the massage components LIN to the following control units:

• Left front backrest massage function control unit (N32/31)
• Right front backrest massage function control unit (N32/32)
• Left front seat cushion massage function control unit (N32/43)
• Right front seat cushion massage function control unit (N32/44)

Interior CAN 

The following signals are also sent via the interior CAN:

• Compressed air supply request
• Seat heater request (for the "hot stone" programs)

Variants 

There are no hardware variants for the multicontour seat control unit. The assignment to the respective seat and the country or left-hand/right-hand drive vehicle assignment is coded by the software.

	Left front multicontour seat control unit wiring diagram		PE91.25-P-2103-97XBA
	Right front multicontour seat control unit wiring diagram		PE91.25-P-2103-97XBB