Test F: Incorrect/Erratic Direction Of Airflow From Outlet(s)
PINPOINT TEST F: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)Normal Operation
Under normal operation, to rotate the mode door actuator, the HVAC module supplies voltage to the Floor/Defrost/Panel mode door actuator motor through the circuit CH229 (WH/BU), and supplies ground through circuit CH228 (YE/GY). To reverse the mode door actuator rotation, 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.
- DTC B1003 Mode Door Failure - The module senses no change in actuator feedback voltage when the actuator motor has been energized.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Floor/defrost/panel mode door actuator motor
- HVAC module - electronic manual temperature control (EMTC)
- HVAC module - electronic automatic temperature control (EATC)
- HVAC module - dual automatic temperature control (DATC)
- Stuck or bound linkage or door
F1-F2:
F2-F3:
F4-F5:
F6-F8:
F8-F10:
F10-F12:
F12-F13:
F13-F14:
F14-F15:
F15-F16:
F16-F17:
