Pushrod,
The problem is that the XM Radio Module (Digital Tuner) is a completely separate box from the head unit. It is usually mounted in the dash behind the glove box, out of sight.
This box cannot be bought as a part, as GM has it on parts restriction. Also, it locks itself to the VIN number of the vehicle it is installed in, and will display "Locked" on the radio display if moved to another vehicle. Dealers cannot unlock the XM Digital Tuner Box. They must send it in to GM/Delphi for a replacement if there is a problem with it. Therefore, a used part is not an option, either.
Sorry...
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