Towing Recognition Control Module -J345-

General Information

The towing recognition control module -J345- recognizes "trailer mode" when there is a power decrease of at least 5W and transmits this information to various control modules via the CAN data bus.

The vehicle electrical system control module -J519- and the comfort system central control module -J393- supply the towing recognition control module -J345- with information via the CAN data bus.

At least turn signals or side marker lamps must be switched on to detect trailer mode.

For information on testing control modules, diagnosing malfunctions, malfunction indicators and fault finding, refer to [FOR ENGINE(S) AXQ, BMX, BHK, BWF, BAR, BAA, BKW] DIAGNOSIS AND TESTING .