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How to Wire the 2009 VW Jetta with a Trailer Towing Wire Kit


I bought a tow ready Modulite HD #119190 kit for the above car. I followed the directions & the trailer lts. work fine until I turn on my headlights & then the brake & signal lts no longer work. Do you have any specific instructions for a 2009 Jetta TDI ? Thanks


Expert Reply:

Yes, the 2009 VW Jetta has a alternate wiring system called multiplexed, which means that multiple signals on each side of the vehicle are carried on one wire. The part # 119190, Heavy Duty ModuLite with Circuit Protection, is the correct harness but you will need to wire the converter differently on your vehicle. We have a Tech Bulletin (see link) that you can review to help also.

On the drivers side behind the taillight you will need to find the wire that has multiple functions, with a circuit tester, item # 40376 if needed. Connect the yellow wire from the converter box to this circuit. Next Locate the taillight circuit that has 12 volts and attach the brown wire to his circuit. Run the green wire to the passengers side and connect this wire to the multiple function wire on the passenger side behind the taillight. Connect the red brake wire to the ground wire and secure to a solid clean ground. Finally route the battery via the inline, 10 amp, fuse to the vehicle battery and test with a test light.

This should get you towing.

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