Bruce Audi A8

Hello.

I have a 2004 audi a8 4.2 and the wipers are not working. Fuses are fine and the wipers just dont work. VCDS doesnt throw any codes for this, not even the windscreen washer works, only the headlight washer comes out but no washer pump noise. the wipers were working perfectly fine when we bought the car and then it stopped but worked every time you hit a bump then it stopped working completely. Please help because no auto electrician can find a fault. Even the audi dealer computers dont pick up a fault.

Any advice on how to fix this will be much appreciated.
Thanks