Just wanted to comment since I was able to reproduce this today on my 2008 Audi A3 2.0 with the Concert II (I believe) radio.
I did the wiring by cutting one end off a normal 1/8th to 1/8th stereo cable and soldering the R, L and Gnd pins to ISO connectors (Audi Part Number 000-979-009, which I got from my local VW dealer). Then I plugged the pins into the existing wiring harness at the back of the stereo. I routed the other end of the stereo wire (the end with the remaining 1/8th male connector) out the passenger side panel. Pretty straight forward once you have the Audi/VW connectors. This link was helpful: http://www.audizine.com/forum/showth...or-Symphony-II
The VAG part was a bit more tricky. I asked the service department at my local Audi dealer (Maita Audi, for the record) if they could do the reprogram for me to enable the aux input. The guy got a funny look on his face and said no such thing was required, nor had he even heard of such a thing. Of course, he was wrong.
I ordered the VAG K+CAN connector from eBay. There wasn't a driver on the CD, so I found and installed the FTDI VCP (virtual COM port) driver from ftdichip.com. No additional setup for my win7 laptop.
Then I brought my laptop out to the car and plugged the VAG connector into the slot above the dead pedal. I also had to turn on, but not start, the car.
I then launched VAG commander from the CD. I selected Target 82 and hit "Open Channel." My radio then said "DIAG." At this point I wasn't too sure what to do.
Using the "Coding" values from this link (http://wiki.ross-tech.com/wiki/index...ration_II_Plus), I was able to figure out the 7 digit code I needed to use. I wanted aux (obviously), multifunction wheel, leather interior, wagon, and North America to be set, so my value was 0300122. Then I copied this value into the Value(HEX) field on VAG commander and clicked "Coding." This gave me an error stating "Conditions not correct." Then I reviewed Lordneon's instructions and saw that he omitted the leading 0 (which gave me 300122 in Value(HEX)). Again, I clicked "Coding." This seemed to do the trick! Then I clicked "Close Channel" and disconnected the VAG cable.
After all that, I can click CD twice on the radio and get to the aux input! Thanks to everyone for the instructions. Hope my details help someone out there.








), who told me at the time I picked it up that they could not obtain it from AoA as it was a VW part. The parts guy said he was able to get it from his VW counterpart.
