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There's 2 bluetooth modules if you have a 2SS, one in the PDIM for playing music and one in the OnStar unit for using for hands free calling. The problem is, the latter is part of the OnStar unit. Your car may not even have one. Or maybe they just remove the fuse for it? I don't know what the protocol is but this is likely the same for all GM cars so I'm sure if it's possible, someone has done it for another vehicle before.
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