Pinpoint Test 2: Incorrect/Erratic Direction of Airflow From Outlets

PINPOINT TEST 2: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS

Normal Operation
To rotate the mode door actuator clockwise, the electronic manual temperature control (EMTC) module supplies voltage to the FLOOR/DEFROST/PANEL mode door actuator motor through circuit (Y/GY), and supplies ground through circuit (W/L). To rotate the mode door actuator counterclockwise, the EMTC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the EMTC module through circuit (GY/L) and a 5-volt reference voltage on circuit (BR/W). The EMTC module reads the voltage on the mode door actuator feedback circuit (Y/V) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

B12A4-B298B:

Possible Causes
- Wiring, terminals or connectors
- Mode door actuator
- EMTC module
- Stuck or damaged linkage or door

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Step 2-Step 5:

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