[A8L Chick]

Originally Posted by snapdragon

I'm not so sure it is the window itself as each element is in parallel, so if one was damaged, it would only affect that line rather than all of them.
The main ones at the sides are too robust to be damaged in normal use.
According to the SSP287_035 PDF, "The Central Control Module for Comfort System actuates the heated rear window over the Rear Window Defogger Relay J9. The relay activation information is supplied to the Central Control Module for Comfort System by the Climatronic Control Module."

Looks like CC panel sends a message via CANBUS to the Central Control Module and that sends juice to the J9 relay.
see page 45, but the relay output goes through C18 radio interference suppressor on the way, so maybe that is duff!
https://dl.dropbox.com/u/1273965/A8L...Components.pdf
https://dl.dropbox.com/u/1273965/A8%20fuses-pred-d3.doc (see p.17 for fuse and relay location if you haven't got that far)

Good luck

Thanks for all inputs so far guys, and I will possibly put this to audi

However, it may be a massive co-incidence, but when I have my lights on, I am noticing allot more interference through the radio than normal. Being a biker, I always have my lights on..

I wonder where this part is located?? Could this be the culpret.

Yes it's the whole screen that is currently faulty-not a single line of demist