In my 04 grand prix with 6 disk changer I can flip through my band and it will go through FM1, FM2, AM, XM1, and XM2. If you have XM your car should have an antenna for it normally on top of the roof near the back windshield, it should even have the XM symol on it. To activate you can just go to xmradio.com and activate it. They will need the ID number for the XM and to get that you just go to your XM setting on the radio and I think station 1 and it will show you the ID. Not sure if it helps but thats what I had to do with my 04.