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

Model 238 

Up To Model Year 2021 

With Code 399 (Front multicontour seat with massage function) 

Courtesy of MERCEDES-BENZ USA

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
• 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:

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

Read in sensors and signals 

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

• Air cushion adjustment request
• Massage 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 integrated in the multicontour seat control unit.

Actuation of components 

The multicontour seat control unit actuates the following components via direct lines:

• Left front multicontour seat pneumatic pump (M25/8)
• Right front multicontour seat pneumatic pump (M25/9)
• Integrated piezo valves

Transmitting signals 

The multicontour seat control unit sends the following signals over the interior CAN:

• Status of multicontour seat
• Status of massage function
• "Hot-Stone" request

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-2103-97DCA
	Right front multicontour seat control unit wiring diagram		PE91.25-P-2103-97DCB