It's a cigarette-packet sized metal box in the waterproof box full of ECU's under the bonnet - nearside by the bulkhead and wheel arch.
Unfortunately it's right at the bottom under several others. 
I bought one from A8parts (not expensive) had a look in the box and gave up; paid a local Audi specialist to swap it over.
I decided that it was the controller not the stalk after doing all the things everyone else did and realising it randomly stopped without me touching the stalk at all. Not only that, it either worked or didn't - just not consistent with dirty switches.
I'll see if I can find the thread....
EDIT: Have a read here: http://forum.a8parts.co.uk/showthread.php?t=113 it covers most of what you want to know, even what I paid the garage!
You'll note that I had had my stalk replaced once (professionally) a while back - I think that was a genuine switch fault as "some" functions worked. Then the box was the next problem
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 11th October 2012 at 03:15 PM.
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