Test M: The Blower Motor Does Not Operate Correctly - EMTC

PINPOINT TEST M: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EMTC

M1-M2:

M2-M4:

M4-M6:

M7-M9:

M10:

Normal Operation
Under normal operation, the blower motor is provided a ground from the blower resistor through circuit 752 (YE/RD). The resistor gets a ground from circuit 1205 (BK) in the lowest blower setting. In MED-LO and MED-HI the resistor gets a ground from the blower motor switch through circuit 260 (RD/OG) or 269 (LB/OG), depending on selected speed. In HI, the blower motor is grounded directly through the blower motor switch from circuit 752 (YE/RD) to circuit 1205 (BK). The blower switch receives its ground from circuit 1205 (BK).

Possible Causes
- An open in circuit 1205 (BK), 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
- A short to ground in circuit 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
- A short together circuits 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
- Blower motor resistor
- Blower motor switch