einstein, I had found an adapter harness for a family member's 2005 Tahoe that simply plugged inline between the radio and the vehicle harness and added an "aux" input to the factory radio (to which I then attached an external bluetooth adapter). I looked through Amazon and ebay to see if there was something like that for sale for your car, but nothing even remotely similar popped up; GM must have changed the radio protocols between 2005 and 2008.
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Mike
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