Test G: The Blower Motor Does Not Operate Correctly

PINPOINT TEST G: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY

G1-G2:

G2-G4:

G5-G6:

Normal Operation
Under normal operation, ground for the blower motor is supplied by the blower motor resistor or blower switch through circuit CH430 (VT/OG). In LOW, the resistor is grounded through circuit GD123 (BK/GY). In MED-LOW and HIGH, the resistor is grounded to the blower switch through circuit CH428 (GN/WH) and CH429 (GY/BN). In HIGH, the blower motor is directly grounded to the blower switch through circuit CH430 (VT/OG). The blower switch is grounded through circuit GD121 (BK/YE).

Possible Causes
- An open in circuit GD121 (BK/YE), GD123 (BK/GY), CH430 (VT/OG), CH429 (GY/BN) or CH428 (GN/WH)
- A short to ground in circuit CH430 (VT/OG), CH429 (GY/BN) or CH428 (GN/WH)
- A short together circuits CH430 (VT/OG), CH429 (GY/BN) or CH428 (GN/WH)
- Blower motor resistor
- Blower motor switch