Towing / Trailer System: Description and Operation

Towing Recognition Control Module (J345)

The Towing Recognition Control Module - arrow - is located behind the left luggage compartment side trim.


From MY 2010





General Information

The towing recognition control module detects from a performance decrease in the"towing mode" of at least 5 W and sends this information to diverse control modules via CAN-Bus. At least the turn signal or parking lamp must be switched on to detect "use of trailer".

The towing recognition control module is supplied with information (light control) from the Vehicle Electrical System Control Module (J519) and Comfort System Central Control Module (J393) via the CAN databus.

DTC Recognition and Display

The towing recognition control module is equipped with OBD.

Use the Vehicle diagnostic tester under "Guided Fault Finding".

Remove and install the towing recognition control module , from MY 2010, refer to => [ Towing Recognition Control Module (J345), from MY 10 ] Service and Repair.

Replace the towing recognition control module , from MY 2010, refer to => [ Replacing, from MY 10 ] Replacing, from MY 10.

Towing recognition control module output diagnostic test mode bulbs (from MY 2010), refer to => [ Towing Recognition Control Module (J345) Output Diagnostic Test Mode Bulbs, from MY 10 ] Towing Recognition Control Module (J345) Output Diagnostic Test Mode Bulbs, from MY 10.