I have Audi A4 1.8T 2003. There is no CD Changer Wiring harness installed !? I have checked already with Audi. I have two options : 1.To buy wiring harness 180 CAD from dilership (and pay extra 350.00 for installation).
2.Make My own Cable !?
If anyone has pin-out for this cable- would be great.Not just for me but for all other people with this problem ::).
I See your post is Old :-/
but i try this.
I by Phatbox and i make modifications to stantart wiring Harness i have a diagram of Addresses for my car Audi A4-B7 but i thing is the same with your car.
(http://tech.bentleypublishers.com/servlet/JiveServlet/download/33-19439-185633-2231/final%20connections.jpg)