just purchased an A4 with the audi symphony cd/radio. when the "sat" button is pushed - the message is "sat" not available. audi also has the tire monitoring feature. supposedly the audi is prewired. looked in the compartment on the drivers side in the trunk and there is nothing there. is the pre-wiring behing the panel? also, where can i find a sirius tuner. the dealed wants your first born child and a lot of $$$$$$$$$$.