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No codes for the restraint module? Our cars have at least a Diagnostic Unit on the air bag system. I don't know if that reports back to the BCM. With the BCM and HVAC modules both having problems, I would start with checking grounds since they may share the same ground point. Really though you may need to step up even more for a different scan tool that can get you further information. Without actual codes, you will have trouble fixing your problem. It likely will be easier to get professional help.
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