If you have proved the switch is working then I would check and see if you have power getting to the switch.
Can you hear the motor when the switch is pressed or pulled?
If not then the motor could be at fault, if there is some motor noise then it could be the cable that pulls the window up or down has snapped. It is rare however for either of these to fail on the A8 but both are common problems on the A6.
The windows have a 'breaker' type thing that sits under the dash at the driver side. These are supposed to reset themselves if they blow due to a current overload (stuck window for example) but again it would be worth a check before you start dismantling the door. Swap them around and see if the fault moves to another window.
Hope that is some help......
|