I think it's this you need, it's a common fault, and exactly what happened with my D2 until I had the wire replaced
http://www.audipages.com/Tech_Articl...rereplace.html
If it isn't have a look at the "interior electrics repair sticky" in the D2 section and see if there is anything else that may help.
Good luck, hope you get sorted
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should
Audi TT - 2015 - Ultra