Control Modules In Rear Doors

Fig 1: Identifying Control Modules In The Rear Doors

Courtesy of VOLVO CARS OF NORTH AMERICA.

The control modules in the rear doors are always referred to as the left rear door module (LDM) (3/128) and right rear door module (RDM) (3/129). This is different from the front door control modules which are designated driver door module (DDM) and passenger door module (PDM).

The control modules also have control panels for the window lift mechanisms.

The rear door control modules use serial communication with the front door control module on the same side of the car.

The rear door control modules are directly connected to the lock motor in each door. The door control modules lock and unlock the door on receipt of a command from the front door control module.

The rear door control modules forward the status of the lock motors for child-proof and central locking to the relevant front door control module.