I have a 2009 Chevy cobalt, it's an LT, two door, with all of the pluses like heated seats, OnStar, the upgraded sound system, and sporty look package. However on my car's paperwork it is listed (XM delete) on the features, and I was wondering since I already have the on star/XM antenna, if there is anyway I can get XM through that radio. It has that cat function button however when you press it and it says XM feature only. Thanks for your help in advance!