"Check Trailer Lights" fault on dash

[wpoll]

I guess you have the trailer module fitted (as the CC on the dash is warning you of an issue) but does the loom look correct or are the trailer lights running off "vampire taps" from the vehicle lights rather than from the correct connector in the boot (trunk)?

I had a similar issue when I first hooked up a (known good) trailer to my X5 with "factory trailer wiring". The PO had fitted a bunch of extra wiring for an electric trailer brake and had not addresses the lamp monitoring problems caused by disconnecting the factory wiring. It took me a while to figure out what they had done and return it to normal.

When it was "faulty" the CC gave me warnings (Check Trailer Lights) and occasionally the cars indicators went mad etc. - all very odd. All good now - no problems.

[kvc]

Originally Posted by wpoll

I guess you have the trailer module fitted (as the CC on the dash is warning you of an issue) but does the loom look correct or are the trailer lights running off "vampire taps" from the vehicle lights rather than from the correct connector in the boot (trunk)?

I downloaded the PDF someone posted about fitting the towbar including the wiring diagram etc. From what I can tell, all is fine, with an OEM connector where it should be and no 'vampire taps'. This makes me think that whomever wired the plug may not have done so correctly, or there's a short in the plug perhaps.
I unbolted the plug from tow-bar assembly, pulled the cable down as far as possible to inspect same and also looked inside boot/trunk, disconnecting plug and inspecting for integrity. All seems to be fine from visual inspection.
I've just spoken to my mate the auto sparky and booked in to see him on Monday AM - he's not cheap, but very good. Hope we can sort things out, as trailer plugs are a PITA to rectify by yourself.