[bell]

ErVikingo...........pm me your email and i can send a pdf file of of the tech data i have on the denali, along with a captured illistration of the key cylinder.
it is definitely the digital system, everything is controlled through the BCM from the key cylinder....
the info may not actually help you with your problem, but will give you an understanding on what wires do what and may help when the dealer explains what they found....