Thanks everybody but I think my original question got lost. Again, I've read that ALL GM head units from 2002 to present are configured to operate an XM receiver whether one is installed or not. My understanding is that when XM is activated on a radio it comes up as an additional "Band" just like AM, FM1 or FM2. Assuming this is true I should just be able to plug the USASPEC PA15-GM harness adapter into the back of the head unit to get my iPod on the XM Band. My question is.....Does the head unit have to be reprogrammed by a dealer to set it up for XM since there was no factory XM installed when the car was new? My local dealer charges $105 to reprogram a head unit.
