Test C

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

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Normal Operation
Under normal operation, to open the mode doors, the DATC module supplies the cold air bypass, air inlet, defrost, panel mode and floor mode door actuator motors voltage through the door actuator open circuits and ground through the door actuator close circuits. To close the mode doors, the DATC module reverses the voltage and ground circuits.

The mode door actuator feedback resistors are supplied a ground from the DATC module by the mode door actuator return circuits and a 5-volt reference voltage on the mode door actuator reference circuits. The DATC module reads the voltage on the mode door actuator feedback circuits to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

Door actuator open circuits
- Cold air bypass - 32-FB2 (WH/RD)
- Air inlet - 32-FB8 (WH/RD)
- Defrost - 32-FB5 (WH/BK)
- Panel mode 32-FB7 (WH)
- Floor mode 32-FB6 (WH/VT)

Door actuator close circuits
- Cold air bypass - 33-FB2 (YE/RD)
- Air inlet - 33-FB8 (YE/RD)
- Defrost - 33-FB5 (YE/BK)
- Panel mode - 33-FB7 (YE)
- Floor mode - 33-FB6 (YE/VT)

Door actuator return circuits
- Cold air bypass - 9-FB2 (BN/RD)
- Air inlet - 9-FB8 (BN/RD)
- Defrost - 9-FB5 (BN/YE)
- Panel mode - 9-FB7 (BN)
- Floor mode - 9-FB6 (BN/WH)

Door actuator reference circuits
- Cold air bypass - 7-FB2 (YE/RD)
- Air inlet - 7-FB8 (YE/RD)
- Defrost - 7-FB5 (YE/BK)
- Panel mode - 7-FB7 (YE)
- Floor mode - 7-FB6 (YE/VT)

Door actuator feedback circuits
- Cold air bypass - 8-FB2 (WH/RD)
- Air inlet - 8-FB8 (WH/RD)
- Defrost - 8-FB5 (WH/BK)
- Panel mode - 8-FB7 (WH)
- Floor mode - 8-FB6 (WH/VT)

Possible Causes
- An open, short to voltage, ground or together in door actuator open, close, return, reference or feedback circuits.
- Cold air bypass, air inlet, defrost, panel mode and floor mode door actuator motor.
- DATC module.
- Stuck or bound linkage or door.