When you say you removed the XM receiver are you talking about the head unit of the XM tuner itself? Mine did not come with XM so not sure what it looks like but there is a box behind the glove box that is for OnStar I believe. This is where that roof antenna is connected. If you removed this, that would probably explain why OnStar doesn't work. What do the status lights say on the mirror? If the status lights are what they should be them it is most likely the adapter harness that Rick mentioned.
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I don't care about the "Jeep thing"  as long as my mail is on time!!!
Slate Blue H3 Adventure w/sunroof, Monsoon/NAV, DVD and marker lights
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