Test G: Temperature Control Is Inoperative/Does Not Operate Correctly

PINPOINT TEST G: TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Normal 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:

G11-G14: