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

Model 463 

as of model year 2019 

with code PA9 (Seat Comfort package Plus) 

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
• Adjusting the stored pressure values when calling up the memory feature and storing the contours
• 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 the interior CAN (CAN B):

• Air cushion adjustment request
• Massage function request
• Dynamic function request
• Request for storing/moving to memory position
• PRE-SAFE® adjustment request

Evaluation of input factors 

The input factors read in are evaluated by 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 heating 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.

	Wiring diagram for multicontour seat control unit	N32/15	PE91.25-P-2103-97ZHA
		N32/16	PE91.25-P-2103-97ZHB