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If you can read the part number on your BCM you and get a GM parts guy to cross check the ones Smoking SS has. From what you are describing it sounds like a bad module or loose terminal that need a little heat to amke contact. Years ago in GM SET class. (Specialized Electronics Training) GM gave Techs a set of jumpers with every available terminal end. As new ones came out we could get them in the packard boxes at the dealerships. If you know a GM tech ask him to check the pin fit at your BCM connectors. Also make sure you are getting the proper voltage from the ignition switch and that your grounds are good. More problems than you can even think about are poor terminal contact. Plugging a new part in will help until the connection gets loose again.
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