I have a 2013 S6. Periodically, the adaptive cruise control (ACC) won’t work or will stop working during use. During the period when the ACC isn’t working, the door lock won’t chirp and the driver side rear door will not unlock. This all seems to happen when it is hot outside. I assume it is a loose wire to a computer that loses connection, or high resistance, during hot days. Does anyone have a wiring schematic to determine where the signal for the ACC and door locks originate?

 

I am having this exact same issue with my 2017 Q7. Have you figured out the solution hopefully since this post is aged??
Front drivers door lock unlocks intermittently from the keyfop or inside unlocking. No clear idea why it works only sometimes. All wires and connections through the door look in tact as older Audi's used to break wires through the door hing area into the car body.

Thanks in advance

John
precab@aol