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Volkswagen Polo Service & Repair Manual: Towing Recognition Control Module -J345

Volkswagen Polo Service & Repair Manual / Towing Guide / Technical Requirements / 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 5 W → Note 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 -J519- with information via the CAN data bus.
1)  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 → Electrical Equipment; Rep. Gr.97.
   
Towing Recognition Control Module -J345-, Retrofitting
Retrofitting a Towing Recognition Control Module -J345- approved by Volkswagen is possible, but it can pose problems due to the connection with the vehicle CAN data bus. The control module must then be coded in “Guided Fault Finding” using the → Vehicle diagnostic tester.
  Note
Installation of control module solutions that are available from third parties and are not approved by Volkswagen is not recommended. Installing such equipment voids the warranty. Generally, these are connected to the tail lamps and not integrated into the vehicle electrical system. This can result in a misdiagnosis from the lamp monitoring function or to malfunctions. Also, dimmed bulbs such as combined brake and tail lamps cannot be activated.
   

Towing Recognition Control Module -J345-, Coding

Refer to → Electrical Equipment; Rep. Gr.97 finformation on coding.

13-Pin« Trailer Socket
The backup lamps, »continuous current« and charging cable can be used on the trailer with the »13-pin« trailer socket. A »13-pin« trailer socket is re ...

Engine Cooling
Because towing places higher demands on the engine cooling system, the cooling system is enhanced in vehicles that have factory-installed trailer hitches, if necessar ...

Other materials:

Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „Pressures, Checking“. –  ...

Information on the brakes
First read and observe the introductory information and safety warnings New brake pads cannot generate the full braking effect during the first 200 to 300 km and must first be run in  . However, you can compensate for the slightly reduced braking force by applying more pressure to the bra ...

Rear view
Fig. 3 Overview of the rear of the vehicle Key for : Roof aerial High-mounted brake light Rear window Rear window heating Window aerial Rear window wiper Volkswagen badge, used for opening the tailgate Tail light cluster Number plate lights ...

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