Pinpoint Test 11: Temperature Control Is Inoperative/Does Not Operate Correctly
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PINPOINT TEST 11: TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - HYBRID
Normal Operation
To rotate the blend door actuator clockwise, the dual automatic temperature control (DATC) module supplies voltage to the blend door actuator motors through the door actuator feed A circuits, and supplies ground through the door actuator feed B circuits. To rotate the blend door actuator counterclockwise, the DATC module reverses the voltage and ground circuits.The blend door actuator feedback resistors are supplied a ground from the DATC module by the blend door actuator return circuits and a 5-volt reference voltage on the blend door actuator reference circuits. The DATC module reads the voltage on the blend door actuator feedback circuits to determine the blend door actuator position by the position of the actuator feedback resistor wiper arm.
Door actuator feed A circuits
- LH blend (Y/O)
- RH blend (L/O)
Door actuator feed B circuits
- LH blend (L/W)
- RH blend (BR/G)
Door actuator return circuits
- LH blend (GY/L)
- RH blend (GY/L)
Door actuator reference circuits
- LH blend (GY/L)
- RH blend (GY/L)
Door actuator feedback circuits
- LH blend (GY/L)
- RH blend (GY/L)
B12A0-B297F:
Possible Causes
- Wiring, terminals or connectors
- Blend door actuator
- DATC module
- Stuck or damaged linkage or door
Diagnostic Procedure
Step 1:
Step 2:
Step 3:
Step 4-Step 5:
Step 6-Step 7:
Step 8-Step 9:
Step 10-Step 11:
