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I take it you have checked for power on the Red/Wht along with the 10A HVAC fuse. Also worth checking the Grounds. At the BCM I would add electrical grade dielectric grease to the female side of the two connectors and carefully work the connector back and forth to reseat the pins and hopefully ensure a good connection. The BCM / dielectric grease was the subject of a recall to fix some intermittent connection issues. Also check your scan tool works on another vehicle - I have wasted time troubleshooting only to find my OBD II adapter was faulty. Hope this helps.
 
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