[Cliff8928]

Yes, the factory XM is accessed by pressing the "BAND" button on the radio. It cycles through FM1, FM2, XM1, XM2, AM.

The antenna is mounted on the roof, a few inches from the front and slightly offset to the passenger side. The XM tuner is between the glovebox and edge of the instrument panel on the passenger side. You can kinda see it through behind the fuse box if the car has it installed. You can not use a used XM tuner without having it reset (the dealer can not do this). It will come up "XM theftlocked" on the screen. There are instructions how to bypass this by breaking some connections on the board. Or you can send it out to a repair shop which can clear it.