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Weimar OEM detachable towbar Audio Avant A44

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After using trailer on 2015 A4 car remains in Tow Mode after trailer unhitched. Where is signal obtained to say trailer connected? Anybody know how this can be?

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Normally there will be a micro switch in the towing electrics connector. Are you using an adaptor for you trailer electrics 13 pin to 7 pin and leaving that in the car socket?  That would trigger the microswitch or it’s stuck

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