Test T: The Auxiliary Blower Motor Does Not Operate Correctly Using The Front Auxiliary Climate Controls
PINPOINT TEST T: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY USING THE FRONT AUXILIARY CLIMATE CONTROLST1-T2:
T3-T4:
Normal Operation
Under normal operation, the blower motor is provided a ground from the resistor through circuit 515 (OG/RD). The resistor gets a ground from the front auxiliary blower switch, depending on selected speed, through circuit 269 (LB/OG), 751 (DB/WH), (if not equipped with rear auxiliary controls) circuit 756 (PD/PK) or (if equipped with rear auxiliary controls) circuit 756 (PD/PK)/1120 (BK/WH). In the HI blower selection, the switch provides ground directly to the motor through circuit 515 (OG/RD) The front auxiliary controls are grounded through circuit 57 (BK).
Possible Causes
- An open in circuits 269 (LB/OG), 515 (OG/RD), 751 (DB/WH) or 756 (PD/PK)
- A short to ground in circuits 269 (LB/OG), 515 (OG/RD), 751 (DB/WH), 756 (PD/PK) or 1120 (BK/WH)
- A short together in circuits 57 (BK), 269 (LB/OG), 515 (OG/RD), 751 (DB/WH), 756 (PD/PK) or 1120 (BK/WH)
- Auxiliary blower motor resistor
- Front auxiliary controls