Auxiliary Blower Motor Switch

The auxiliary blower motor provides additional airflow for the back seat passengers. The auxiliary blower motor will operate as long as the HVAC control module is ON. Passengers can operate the system in both manual or automatic modes. The only time the auxiliary blower motor is not available is when the HVAC control module is in FRONT DEFROST. The auxiliary blower motor icon will flash to indicate that the blower is not available.

Power is provided to the auxiliary blower motor from the rear fuse block. Depending upon selected blower speeds, voltage is either supplied directly to the blower motor or voltage is varied by a series of in-line resistors on the ground side of the circuit. Power and ground are provided to the auxiliary HVAC control module by the battery positive voltage, ignition 3 voltage circuit and ground circuit. The auxiliary HVAC control module communicates with the rest of the vehicle on the class 2 serial data circuit.