Rear Window Lift Mechanisms

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Fig 1: Identifying Rear Window Lift Mechanisms

Courtesy of VOLVO CARS OF NORTH AMERICA.

The rear side windows are operated by motors in the doors. The switches for operating the windows are in the door panels. The windows can also be operated from the driver's door module (DDM).

The function is controlled by five relays on the central electronic module (CEM). Depending on whether the control switch is moved up or down, the relays are activated to carry out the requested operation.

Two relays guide the window up on the right and left-hand sides. Two different relays guide the window down. A further relay controls the power supply.

When operated from the driver's position, information is transmitted via the controller area network (CAN) from the driver's door module (DDM) to the central electronic module (CEM) which sends out signals to the relays.

There are diagnostics for the relays for the rear window lift mechanisms.