All of the interfaces I've looked at say your HU has to be SAT ready. How can I tell? I have an '05 with the non-Bose system. Buttons above the CD slot say Radio, CD, SSV, DISP, and it's a 6disc changer.

I'm a n00b :-)

 

All 04-and up cars are sat prewired. Some 03's are sat ready but aren't prewired. Some early 03s aren't sat capable because they don't have a sat button. For 05 and up, you push the radio button to get to sat. If you don't have a sat tuner, it won't show up.