Test U: The Auxiliary Panel/Floor Control Is Inoperative/Does Not Operate Correctly Using The Front/Rear Auxiliary Climate Cont

PINPOINT TEST U: THE AUXILIARY PANEL/FLOOR CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY USING THE FRONT/REAR AUXILIARY CLIMATE CONTROLS

Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the HVAC module - electronic manual temperature control (EMTC) or HVAC module - dual automatic temperature control (DATC) supplies voltage to the auxiliary panel/floor door actuator through the circuit CH207 (BU/GY), and supplies ground through circuit CH208 (GN/OG). To rotate the auxiliary panel/floor door actuator counterclockwise, the EMTC or HVAC module - DATC reverses the voltage and ground circuits.

The auxiliary panel/floor 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 panel/floor door actuator feedback circuit VH438 (GN/VT) to determine the auxiliary panel/floor door actuator position by the position of the actuator feedback resistor wiper arm.

The rear auxiliary panel/floor control is supplied a 5-volt reference through circuit LH111 (BN/WH) and ground through circuit RH111 (GY/BU). When the rear panel/floor control is adjusted, the EMTC or DATC receives the signal through circuit VHA15 (YE/GY).

- DTC B2917 Rear Mode 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 panel/floor door actuator
- HVAC module - DATC
- Stuck or bound linkage or door

U1:

U2-U4:

U4 Continued:

U5-U6:

U6-U7:

U7-U9:

U9-U11:

U11-U12:

U13-U14:

U14-U16:

U16-U18: