I use to have XM radio in my tC when I used a Pioneer head unit. The one thing that always bothered me was I never got to use the steering wheel controls because I didnt want to but the adapter.

After, I pick-up my Xb I wanted XM radio as soon as possible but I didn't want to change the radio this time..................

So, I pick-up a unit for $50 and a $30 mail in rebate. XM Radio foe $20 thats a steel. So, here is pics of the install...............................
hit the AUX

P.S. All I have to do is hit the AUX button and it sounds perfect. Also, if you notice that the background color is Orange, just like the radio.......................

 

Looks Good!!! Did you relocate your Hazard Lights switch?? cause on the Auto's, that switch is just to the left of where your new XM Control Unit is...... NOT over on the right mid way-down. There is a 'blank' there in that spot.. jh

 

Yeah I had to move the hazard light switch to the other side. Then I took that cover and used it to cover up the AUX port.

 

Fedde Le Grand, nice ;)
I love my XM, I'll have to figure out how to place my Inno.