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

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

Test L1-L2:

Test L2-L4:

Test L4-L6:

Test L7_L9:

Test L10:

Normal Operation
Under normal operation, the blower motor is provided a ground from the blower resistor through circuit 755 (BN/WH). 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 751 (DB/WH) or 752 (YE/RD), depending on selected speed. In HI, the blower motor is grounded directly through the blower switch from circuit 755 (BN/WH) to circuit 57 (BK). The blower switch receives its ground from circuit 57 (BK).

Possible Causes
- An open in circuit 57 (BK), 755 (BN/WH), 751 (DB/WH) or 752 (YE/RD)
- A short to ground in circuit 755 (BN/WH), 751 (DB/WH) or 752 (YE/RD)
- A short together circuits 755 (BN/WH), 751 (DB/WH) or 752 (YE/RD)
- Blower motor resistor
- Blower motor switch