This works for the popular connects 2 harness CTSAD003 or CTSAD002 for audi a4s B6/B7s, I don't know if it works with any other harnesses, but you'll have to contact connects2 about that. Using my CTSAD003 harness my steering wheel controls work perfectly with my pioneer head unit on my A4 B7, (I have another one, I got this extra but do not need it.) This also works for sony headunits the CTSONYLEAD. It is the exact same item, just two different item names, weird I know. This is a separate piece that you will have to buy in addition to buying the harness. The patchlead is new in box, I am selling for 8 shipped (paypal), about 2 dollars cheaper than Enfig, and cheaper than you can get it overseas, especially when you factor in shipping. PM me and post on here if interested. Here are the item details. The connects 2 harnesses are the best BAR none for all you guys who own an A4 B6/B7 can attest to.

CONNECTS2 CTPIONEERLEAD EnfigCarStereo.com

Thanks lads.
AudiJ