Test T: The Auxiliary Temperature Control Is Inoperative/Does Not Operate Correctly Using The Front/Rear Auxiliary Climate Cont
PINPOINT TEST T: THE AUXILIARY TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY USING THE FRONT/REAR AUXILIARY CLIMATE CONTROLSNormal Operation
Under normal operation, to rotate the temperature door actuator clockwise, the HVAC module - electronic manual temperature control (EMTC) or HVAC module - dual automatic temperature control (DATC) supplies voltage to the auxiliary temperature door actuator through the circuit CH233 (VT/BN), and supplies ground through circuit CH234 (YE/GN). To rotate the auxiliary temperature door actuator counterclockwise, the EMTC or HVAC module - DATC reverses the voltage and ground circuits.
The auxiliary temperature door actuator feedback resistor is supplied a ground from the EMTC or HVAC module - DATC through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The EMTC or HVAC module - DATC reads the voltage on the auxiliary temperature door actuator feedback circuit VH439 (GY/VT) to determine the auxiliary temperature door actuator position by the position of the actuator feedback resistor wiper arm.
The rear auxiliary temperature control is supplied a 5-volt reference through circuit LH111 (BN/WH) and ground through circuit RH111 (GY/BU). When the rear temperature control is adjusted, the EMTC or DATC receives the signal through circuit VHA15 (YE/GY).
- DTC B2916 Rear Blend Door Circuit Failure - The module senses an open/short in the feedback circuit or no change in actuator feedback voltage when the actuator motor has been energized.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Auxiliary temperature door actuator
- HVAC module - DATC
- Stuck or bound linkage or door
T1:
T1-T2:
T3-T4:
T4-T5:
T5-T7:
T7-T8:
T8-T10:
T10-T12:
T12-T14:
T14 Continued:
T15-T17:
