Control Module

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Fig 1: Identifying Trailer Module (TRM)

Courtesy of VOLVO CARS CORPORATION

The trailer module (TRM) manages the electrical connection between the vehicle and the trailer.

The primary task of the control module is to manage output signals to the tow hitch cable harness for:

Turn signal lamps
Brake light
Parking lamps
Back-up lamp
Fog lamps
+12 V.

The trailer module (TRM) communicates on the controller area network (CAN) with:

central electronic module (CEM)
driver information module (DIM)
differential electronic module (DEM) (option)
parking assistance module (PAM) (option).