Towbar wiring

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Op. No.: 36423 36401

The trailer module manages the electrical connection between the car and trailer in terms of:

  • Direction indicators

  • Brake lights

  • Position lights

  • Reversing lights

  • Fog lights, rear (Does not apply to 4/7-pin)

  • +12 V


Part. No.Description
313460654/7-pinInstallation Instruction
+ Trailer module
Part. No.
Trailer hitch, cable harness, and control moduleInstallation Instruction
Towbar, control module TRMInstallation Instruction
+ Wiring TRM
Part. No.Description
31346554-12Installation Instruction
+ Application1
Part. No.Description

Facts and advantages

  • Especially designed for your Volvo

  • Compatible for trailers equipped with both LED lighting and bulbs

  • The trailer module stores any diagnostic trouble codes (DTCs)

  • Provides driver information if the direction indicators and brake lights on the trailer are not working.

Technical data

Accessory weight:

4/7-pin + Trailer module:

approx. 1.0 kg (2.2 lbs)

13-pin + Trailer module:

approx. 0.7 kg (1.5 lbs)

Trailer Stability Assist (TSA)

TSA is activated automatically upon installation of the trailer module.

The purpose of TSA is to stabilize undamped self-oscillations, which can occur when driving with a trailer. TSA works together with the car's DSTC (Dynamic Stability and Traction Control) system, and stabilization is achieved by braking one or more of the car's wheels and reducing engine torque.

  1. Ordered following a separate procedure and downloaded using VIDA.
Last updated: 1/23/2021