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Test O: The Blower Motor Does Not Operate Correctly - Manual Climate Control

PINPOINT TEST O: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - MANUAL CLIMATE CONTROL


O1-O2:






O2-O4:






O4 Continued:






Normal Operation
Under normal operation, the blower motor is provided a ground from the blower resistor through circuit 261 (OG/BK). The resistor gets a ground from circuit 57 (BK) in the lowest blower setting. In MED-LO and MED-HI the resistor gets a ground through circuit 752 (YE/RD) or 754 (LG/WH), depending on selected speed. In HI, the blower motor is grounded directly through the blower switch from circuit 261 (OG/BK) to circuit 57 (BK). The blower switch receives its ground from circuit 57 (BK).

Possible Causes
- An open in circuit 57 (BK), 261 (OG/BK), 752 (YE/RD) or 754 (LG/WH)
- A short to ground in circuit 261 (OG/BK), 752 (YE/RD) or 754 (LG/WH)
- A short together circuits 261 (OG/BK), 752 (YE/RD) or 754 (LG/WH)
- Blower motor resistor
- Blower motor switch
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