Test L

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

Test L1:

Test L2-L5:

Test L5-L7:

Test L7-L10:

Test L10-L11:

Test L12-L14:

Test L14 Continued:

Normal Operation
Under normal operation, the blower motor is provided a ground from the blower resistor through circuit 261 (OG/BK). The blower motor resistor gets a ground from circuit 1205 (BK) in the lowest blower setting. In MED-LO and MED-HI the resistor gets a ground through circuit 269 (LB/OG) or 260 (RD/OG), depending on selected speed. In HI, the blower motor is grounded directly through the blower motor switch from circuit 261 (OG/BK) to circuit 1205 (BK). The blower switch receives its ground from circuit 1205 (BK).

Possible Causes
- An open in circuit 1205 (BK), 261 (OG/BK), 269 (LB/OG) or 260 (RD/OG).
- A short to ground in circuit 261 (OG/BK), 269 (LB/OG) or 260 (RD/OG).
- A short together circuits 261 (OG/BK), 269 (LB/OG) or 260 (RD/OG).
- Blower motor resistor.
- Blower motor switch.