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

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

Q1-Q3:

Q3-Q4:

Q4-Q5:

Q6-Q8:

Q8 Continued:

Normal Operation
Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) 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 CH217 (BN).

Possible Causes
- An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
- Blower motor control module
- EATC module