I'm not sure if it's something wrong with on-board computer or I just don't know how to turn it on. When the car is started the display is completely off. and only turns on sometimes when some kind of "service" message appears. From then it's working fine.

If it's normal behavior? How do I turn it on manually?

  • Most likely something is wrong with the display and not the computer. There is probably a service message being displayed all the time and when the display happens to come on it seems like it turned on due to a service message. – vini_i Dec 22 '15 at 0:10
  • I've read that some people have some problems with on board computer after battery change. Wondering if that could cause that kind of behavior? – Einius Dec 22 '15 at 8:19

I've just checked with 'Car Gurus' and something as simple as changing the battery or if the battery dies, requires a trip to the dealership to get your system rebooted.

Here is a link to a .pdf for your owners manual: https://exverkickzber.files.wordpress.com/2015/10/audi-a6-c6-owners-manual-pdf.pdf

While there is a reset switch shown for resetting different functions on a working computer, a non-working computer requires dealer reset.

Good luck. :)

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