Test C: Incorrect/Erratic Direction Of Airflow From Outlets

PINPOINT TEST C: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS

Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the HVAC supplies voltage to the floor/defrost/panel mode door actuator motor through the circuit CH228 (YE/GY), and supplies ground through circuit CH229 (WH/BU). To rotate the mode door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the HVAC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module reads the voltage on the mode door actuator feedback circuit VH436 (YE/VT) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

B12A4-B298B:

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Mode door actuator
- HVAC module
- Stuck or damaged linkage or door

C1-C3:

C3-C5:

C5-C7:

C7-C8:

C9-C10:

C11-C14: