[gmachinz]

I believe the factory radio is also tied to the anti-theft and there is a particular way you must reactivate the ecm after removing power from the OE radio-at least this is how my wife's 05 Denali is setup. I like the factory XM satellite radio so for that alone I don't care to change out head units. I had all new control buttons replaced, new bulbs in a few areas and upgraded all the speakers-thats enough for her DD.