Test Q: The Blower Motor Does Not Operate Correctly - EATC

PINPOINT TEST Q: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EATC

Q1-Q3:

Q3-Q5:

Q5-Q7:

Q7-Q9:

Normal Operation
The blower motor control module receives a 1-2 volt signal from the electronic automatic temperature control (EATC) module through circuit 754 (LG/WH) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit 752 (YE/RD) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit 261 (OG/BK)/751 (DB/WH).

Possible Causes
- An open, short to voltage, ground or together in circuits 261 (OG/BK), 751 (DB/WH) or 752 (YE/RD)
- Blower motor control module
- Electronic automatic temperature control (EATC) module