Test H: The Blower Motor Does Not Operate Correctly

PINPOINT TEST H: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY

H1-H3:

H3-H4:

H5-H7:

H8-H10:

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 260 (RD/OG) or 269 (LB/OG), 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), 260 (RD/OG) or 269 (LB/OG)
- A short to ground in circuit 261 (OG/BK), 260 (RD/OG) or 269 (LB/OG)
- A short together circuits 261 (OG/BK), 260 (RD/OG) or 269 (LB/OG)
- Blower motor resistor
- Blower motor switch