New install, not a swap. Plugged in a Sirius unit. Connecters found in a small hatch, drivers side trunk. Everthing connects nicely. However, "no sat" detected. What is the next step? Thanks guys!

 

Try this . . .http://audi.barrystuff.com/s4/satRad...sat_canBus.pdf

 

Dealer has to program radio

 

Never heard anywhere of a dealer needing to program anything, there is a reason why it's called 'Plug 'n Play'. My husband got mine working over the weekend by hooking up an XM antenna in place of the Audi antenna. If you would like detailed instructions please reply.