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 CONTROLSU1:
U2-U4:
U4-U5:
U5-U7:
U7-U8:
U8-U10:
U10-U12:
U12-U14:
U14:
U15-U17:
U17-U18:
Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the electronic manual temperature control (EMTC) or electronic automatic temperature control (EATC) module 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 EATC module reverses the voltage and ground circuits.
The auxiliary panel/floor door actuator feedback resistor is supplied a ground from the EMTC or EATC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The EMTC or EATC module 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 auxiliary panel/floor control is supplied a 5-volt reference through circuit LH111 (BN/WH) and ground through circuit RH111 (GY/BU). When the panel/floor control is adjusted, the EMTC or EATC receives the signal through circuit VHA15 (YE/GY).
Possible Causes
- An open, short to voltage, ground or together in circuits CH207 (BU/GY), CH208 (GN/OG), RH111 (GY/BU), LH111 (BN/WH) and VH438 (GN/VT)
- A short to ground in circuits CH207 (BU/GY), CH208 (GN/OG), LH111 (BN/WH) and VH438 (GN/VT)
- A short to voltage in circuits CH207 (BU/GY), CH208 (GN/OG), RH111 (GY/BU) and VH438 (GN/VT)
- A short together in circuits CH207 (BU/GY), CH208 (GN/OG), RH111 (GY/BU), LH111 (BN/WH) and VH438 (GN/VT)
- Auxiliary panel/floor door actuator
- EATC module
- Stuck or bound linkage or door