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

MODEL ALL (CAR) 

with CODE 550 (Trailer coupling) 

Overview 

This document contains the following information:

• Location 
• Task 

Location 

The trailer recognition control unit is located at the side behind the cover in the trunk.

Task 

The trailer recognition control unit is connected to the network architecture of the vehicle via the interior CAN (CAN B).

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)

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

• "Trailer detected" status
• "Light function on trailer" status
• Position of ball neck
• Status of ball neck lock
• "Show display messages" request