Test E: Incorrect/Erratic Direction of Airflow From Outlet(s)

PINPOINT TEST E: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)

E1-E2:

E2-E3:

E4-E6:

E7-E9:

E9-E11:

E11-E13:

E13-E14:

E14-E15:

E15-E17:

E17-E18:

E19:

Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the EMTC module or EATC module supplies voltage to the Floor/Defrost/Panel mode door actuator motor through the circuit 1989 (OG/LB), and supplies ground through circuit 1988 (BN/OG). To rotate the mode door actuator counterclockwise, the EMTC module or EATC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the EMTC module or EATC module through circuit 438 (RD/WH) and a 5-volt reference voltage on circuit 436 (RD/LG). The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuit 1982 (LB/BK) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

Possible Causes
- An open, short to voltage, ground or together in circuits 1988 (BN/OG), 1989 (OG/LB), 438 (RD/WH), 436 (RD/LG) and 1982 (LB/BK)
- Floor/defrost/panel mode door actuator motor
- EATC module
- EMTC module
- Stuck or bound linkage or door