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Thanks very much for your response. I also have the dedicated Westfalia towbar wiring harness installed and have enabled the tow module in the computer by entering the code. Additional background on my scenario can be found here. Is there a crossover wire I could add to the Westfalia tow bar...

2008 A4 B7 Avant Is there a way to activate the car's computer into tow mode when using a bypass relay for lighting? The computer has been enabled for towing, but by using the bypass relay instead of the dedicated Westfalia towbar wiring harness, the car won't know when a trailer is attached...

Hello??

Help please! This has been an expensive year long saga. Thanks in advance for any assistance. Background: 2008 A4 B7 Avant I purchased and properly installed the dedicated wiring harness (Audi A4 Avant 7 Pin Electrics Dedicated Oct 04-08 19010506RC) for my removable towbar about a year ago...