Control Module

Fig 1: Locating Differential Electronic Module Mounting

Courtesy of VOLVO CARS OF NORTH AMERICA.

The differential electronic module is mounted directly onto the housing for the coupling unit. It forms part of a unit with the stepper motor and the control valve.

The control module receives signals from the engine control module (ECM), central electronic module and brake control module via the control area network (CAN). The control module uses these signals to determine the oil pressure for the clutch pack in the coupling unit. The oil pressure on the multi-plate clutch determines the torque that can be transferred to the rear wheels.

All wheel drive is disengaged if there is a fault in the differential electronic module.