I might be able to help a little. I am currently in the process of installing the better radio (6 disc w/xm) in place of my standard stock radio. I physically installed the radio yesterday. The connections from the base radio vs. the upgraded 6 disc radio are the same. The install took about 5 mins. However, as f5fstop stated, the radio did in fact lock on me. So, it will be at the dealer tomorrow to be unlocked. I've been told, and am HOPING, that once unlocked, I will have XM radio and not have to add any other hardware, I'll just need to subscribe. I'll keep you posted. f5fstop, do you think I'm going down the right path here?
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2008 Hummer H3 Alpha Adventure. Graphite Gray Metallic.
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