...plus, I forgot, there is a 10 or 12 pin connector on the bottom behind the bumper. There are two actually, one for park aid one for headlight washers.
Undo the bottom engine cover and you should be able to gain access unless you have hands like ogr 
Both are located on the right hand side (if you stand on front of the car), close to that little fog light grille.
Good luck 
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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