A few years back I swapped the VW fitted Towbar from our 2004 T5 Van onto our new 2012 T5.1 , I swapped out the bar which was the easy part , I also swapped over the VW wiring loom but thats when the S***T hit the fan . The loom was not compatible with the new can bus system VW fitted to the later models , we lost all lighting and indicators for a while . After VW told me it was going to cost over $600 for the newer loom I started looking for an alternative , while driving past a Speedy Tow bar place I stopped and told the guy what had happened mid conversation he plonked a small device onthe counter and said it was the answer. Now in the time before that i had removed the old harness and reset the can bus by discconecting the battery so no faults , I was toying with using relays to get the trailer lights to work as they would not interfere with the can bus , the device the guy sold me for $120 was in fact a small box with six relays built in with all the wires listed to connect . So an hour or so later it was all hooked up and works perfectly , no need for VW to recode the sytem and i can run LED lights on the trailer . Now six years later my $120 box is still working perfectly and no issues with VW systems , sometimes you have to think outside the box to get a good result . I think the problem is that VW dont want you to add anything to their cars unless its VW approved and VW fitted , well screw them and their technology .
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