Test V: The Auxiliary Temperature, Panel/Floor and Blower Motor Controls Are Inoperative/Do Not Operate Correctly Using The Fro

PINPOINT TEST V: THE AUXILIARY TEMPERATURE, PANEL/FLOOR AND BLOWER MOTOR CONTROLS ARE INOPERATIVE/DO NOT OPERATE CORRECTLY USING THE FRONT/REAR AUXILIARY CLIMATE CONTROLS

V1-V2:

V3-V5:

V5-V7:

V7-V9:

V9-V10:

Normal Operation
Under normal operation, the panel/floor and cool/warm signal is received by the electronic manual temperature control (EMTC) or electronic automatic temperature control (EATC) module from the rear auxiliary control through circuit VHA15 (YE/GY). The blower speed signal is received by the EMTC or EATC from the rear auxiliary control through circuit VHA17 (VT/GN). Reference voltage for the auxiliary controls signal resistor is provided by the EMTC or EATC module through circuit LH111 (BN/WH). Ground for the auxiliary controls signal resistor is provided by the EMTC or EATC module through circuit RH111 (GY/BU).

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

Possible Causes
- An open in circuit RH111 (GY/BU), VHA15 (YE/GY), VHA17 (VT/GN) or LH111 (BN/WH)
- A short to ground in circuit VHA15 (YE/GY), VHA17 (VT/GN) or LH111 (BN/WH)
- A short to voltage in circuit VHA15 (YE/GY), VHA17 (VT/GN) or RH111 (GY/BU)
- A short together circuits RH111 (GY/BU) and VHA15 (YE/GY), VHA17 (VT/GN) or LH111 (BN/WH)
- Rear auxiliary control
- EATC module
- EMTC module