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Relays and Modules - Windows and Glass > < Control Module, Transfer Case|Specifications|Page 1238
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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.

Relays and Modules - Windows and Glass > < Control Module, Transfer Case|Specifications|Page 1238