Audi Q7 trailer hitch electrical problem

2 messages, Last post on Mar 28, 2009 at 10:22 PM

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What is this discussion about? Audi Q7, Electrical, SUV

#1 of 2 Audi Q7 trailer hitch electrical problem by topoftherock Mar 08, 2009 (7:18 am)
I recently had a dealership add an Audi hitch, and electrical harness with 7 to 4 pin adapter to my 2007 4.2 Q7. When I hooked up my trailer most everything works (turn signals, hazard lights) except the brake lights. When starting the car I get a message that the brake bulbs are out, first on the left side, then both. Notes: The trailer lights are brand new, and work fine on a friends Tahoe. They are standard bulb lights (not LED). I bought a second 7 to 4/5 Pin adapter and the problem exists with it and the one supplied by Audi initially. Has anyone experienced this issue? Any suggestions? Replies to this message: muddy3 (Mar 28, 2009 10:22 pm)
#2 of 2 Re: Audi Q7 trailer hitch electrical problem [topoftherock] by muddy3 Mar 28, 2009 (10:22 pm)
Replying to: topoftherock (Mar 08, 2009 7:18 am) I had same problem with Tiguan when I installed trailer control box to complete VW pre-wiring. Take it back to dealer and tell them to log on to vehicle computer and activate trailer option as right now system doesn't know there is trailer. There is several locations they have to go through to complete activation. I have my own VAG-COM cable so it is kinda sad to see service guys don't know crap about the brand they represents.