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  1. M

    How to trick Car's Computer Into Trailer Attached Mode?

    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...
  2. M

    Towbar Electrical: Possible to combine dedicated wiring harness and bypass relay, or?

    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...
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