Test G: Temperature Control Is Inoperative/Does Not Operate Correctly
PINPOINT TEST G: TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLYNormal Operation
Under normal operation, to rotate the blend door actuator clockwise, the HVAC module supplies voltage to the blend door actuator motor through circuit CH233 (VT/BN), and supplies ground through circuit CH234 (YE/GN). To rotate the blend door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.
The blend door actuator feedback resistors are supplied a ground from the HVAC module by circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module reads the voltage on circuit VH439 (GY/VT) to determine the blend door actuator position by the position of the actuator feedback resistor wiper arm.
B12B3-B297B:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Blend door actuator
- HVAC module
- Stuck or damaged linkage or door
G1-G3:
G3-G5:
G5-G7:
G7-G8:
G9-G10:
