All other a/c functions seem to operate correctly except fan control. fan control on the dash and the one on the steering wheel have no effect. blower runs on high no mater what you do.....
The blower motor resistor could be the cause, if not then its a problem directly relted to the ecm. There is not other components that control this circuit. I would check to verify there are all powers and grounds needed. if not I would bring it to the dealer or a reputable shop that can check the functionality with the scan tool and multimeters and such.
Hope this helps
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