Quote:
Originally Posted by MikkiJayne
The factory harness does indeed have a function for this. The 13-pin Euro socket has a switch in it which disables the car's own rear fog light (in favour of the one on the trailer) and turns off the PDC when a plug is inserted. Its a single wire in to the PDC module in the boot, I forget which pin. If you have a 7-pin socket I'm not sure how you would do it automatically.
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If Cambridge University had a Professor of Audi Studies, it would be you MJ!