Test N
PINPOINT TEST N: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EATCTest N1:
Test N2-N5:
Test N5-N7:
Normal Operation
Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 461 (OG). The coil receives voltage through circuit 30-FA24 (RD/OG). Voltage is supplied to the relay contacts from circuit 30-FA24 (RD/OG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 399 (BN/YE). Ground for the motor is provided through circuit 755 (BN/WH) from the blower control module. Ground for the blower control module is provided by circuit 57 (BK). The EATC module sends a pulse width modulated signal to the blower control module through circuit 269 (LB/OG) to control the blower speed.
Possible Causes
- An open in circuit 269 (LB/OG).
- A short to ground in circuit 755 (BN/WH) or circuit 461 (OG).
- A short to voltage in circuit 269 (LB/OG) or circuit 399 (BN/YE).
- Blower motor control module.
- EATC module.