Check the headlight switch, this could be the source of the problem.
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Subject: Dead instrument panel and dash lights
Author: Matt West <firstname.lastname@example.org> at Internet
Date: 2/23/96 01:31 PM
Thanks to everyone you mailed me and welcomed me to the Quattro list
the other day. I now have a problem with my 1989 Audi Coupe that I
hope someone can help me with.
All the back-lighting lamps in the main instrument panel, heater
controls and auxiliary instrument panel have died. As they all went
together it would indicate that a fuse has blown, rather than bulb
failure. The fuse (which also protects other circuits) in the main
fuse box is OK.
Does anyone know where I should check next ?
Are there any hidden in-line fuses that protect this circuit ?
Could it be the connection to the side light circuit that activates
the instrument panel lighting and if so, where is this connection