Faulty Rear HVAC Blower Control
Rear HVAC Blower Control harness is open or shorted
Rear HVAC Blower Control circuit poor electrical connection
Faulty Heating, Ventilation, and Air-Conditioning (HVAC) Module
Engine Light ON (or Service Engine Soon Warning Light)
Under normal operation, the rear auxiliary control is supplied a 5-volt reference and ground from the Heating, Ventilation, and Air-Conditioning (HVAC) Module. When the auxiliary blower motor speed, airflow mode or temperature control is adjusted, the HVAC module reads the voltage from the rear auxiliary climate controls on the auxiliary blower motor speed, airflow mode, and temperature control feedback circuits to determine the requested setting. The OBDII code sets when the HVAC module senses an open, or short to ground or voltage on the rear auxiliary climate controls airflow mode input circuit.