Control Module: Description and Operation

Control Module, All-wheel Drive (724)

Location
Control module, all-wheel drive (724)

Main function
The function of the control module is to regulate the engagement of the differential clutch, and on cars with limited slip differential clutch its engagement too.

Type
Has a microprocessor, see Control module, general description. The software in the control module can be updated with SPS.







Electrical connections

K12







K4







Diagram







Function
The XWD control module, abbreviated to RDCM, is connected to the vehicle's P-bus. Its bus messages are used to determine the operating/driving conditions for the vehicle, and accordingly how much drive torque should be transferred to the rear wheels. The control module and control valve are calibrated together, and they must be replaced together without exception.