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

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

N1:

N2-N5:

N5-N7:

N8:

Normal Operation
Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 1322 (BN/WH). The coil receives voltage ignition voltage through circuit 296 (WH/VT). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 261 (OG/BK). Ground for the motor is provided through circuit 515 (OG/RD) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.

Possible Causes
- An open in circuit 1120 (BK/WH)
- A short to ground in circuit 515 (OG/RD) or circuit 1322 (BN/WH)
- A short to voltage in circuit 1120 (BK/WH) or circuit 261 (OG/BK)
- Blower motor control module
- Blower motor relay
- EATC module