How can I make my Audi A6's dash display brighter?

The display in my 2001 Audi A6 TDI 2.5-litre's dash is not clear at all. When I first got the car four days ago I couldn't make out anything at all. It did clear slightly, but now it has gone funny again. The car did have a completely dead battery when I got it.

Asked on 16 September 2010 by littlejim

Answered by Honest John
There may be a panel rheostat to increase the light level.
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