Trailer Recognition Control Unit, Basic Function - GF31.19-P-9890A

Model All (4xWD) 

Model All (CAR) 

Overview 

This document contains information on:

• General 
• Function 

General 

The trailer recognition control unit is located on the right in the trunk/load compartment.

Function 

The trailer recognition control unit is connected to the network architecture of the vehicle.

The trailer recognition control unit controls the lighting system of the trailer and the swiveling of the ball neck (vehicles with electrically-driven ball neck). To implement the functions, the trailer recognition control unit processes, among others, the following information:

• Circuit status
• "Switch on light function on trailer" request
• Request for trailer socket emergency shutoff
• "Swivel ball neck" request (vehicles with electrically driven ball neck)
• Trailer tightening angle request (vehicles with trailer maneuvering stabilization)

The trailer recognition control unit processes these input factors and sends, among others, the following information:

• "Trailer detected" status
• Status of light functions on trailer
• Position of ball neck
• Status of ball neck lock (vehicles with electrically-driven ball neck)
• Trailer rotation angle (vehicles with trailer maneuvering stabilization and articulation angle sensor)
• Show display messages request