Trailer electrics - help! (Please)

John A

Off of VDub Radio
VCDS User
VIP Member
T6 Pro
Following on from this thread, I am trying to get to the bottom of my trailer electrics problem.
Short version - no problems at all until I pulled a trailer at the end of January 2024 (we had owned the van 10 months by then).
After disconnecting the trailer, the headunit still shows a trailer connected and the park sensors don't work until I press the brake (and presumably create an open circuit).

Following advice about a potentially knackered switch, I have replaced the socket with another VW/Audi OEM branded 7-pin socket with a switch.

I have followed the wiring diagram according to PF Jones website and am still having the same problem.

Trailer Electrics.jpg

I've just had my meter on the pins and every pin shows a voltage except for pin 2 - the foglight.
I have switched the foglight on and nothing is sent to the pin. I have pressed the switch in (to open the contact) and still see nothing at the pin.

It has a Brink-supplied Jaeger module and both fuses are intact and closed (if I remove the fuses, the OPS throws a wobbler and I get a continuous tone).
Van has factory fitted LED tail lights (odd because it didn't have factory headlights and I thought they only came as a set) and the trailer electrics are coded.

Faulty module or dodgy wiring?
 
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