Blower Motor

BLOWER MOTOR

Diagnosis Procedure


1. CHECK BLOWER MOTOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect blower motor connector.
3.Turn ignition switch ON.
4.Check voltage between blower motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 2.

2. CHECK FUSE

1.Turn ignition switch OFF.
2.Check 15 A fuses [Nos. 21 and 22, located in fuse block (J/B)].
NOTE:
Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES- GO TO 3.
NG- Replace the fuse after repairing the applicable circuit.

3. CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR OPEN

1.Disconnect fuse block (J/B) connector.
2.Check continuity between blower motor harness connector and fuse block (J/B) harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between blower motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair harness or connector.

5. CHECK BLOWER RELAY GROUND CIRCUIT

1.Disconnect fuse block (J/B) connector.
2.Check continuity between fuse block (J/B) harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK BLOWER RELAY

Check blower relay. .
Is the inspection result normal?
YES- Check ignition power supply circuit. Ignition Power Supply.
NO- Replace blower relay.

7. CHECK POWER TRANSISTOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Connect blower motor connector.
3.Disconnect power transistor connector.
4.Turn ignition switch ON.
5.Check voltage between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 11.
NO- GO TO 8.

8. CHECK POWER TRANSISTOR POWER SUPPLY CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect blower motor connector.
3.Check continuity between power transistor harness connector and blower motor harness connector.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair harness or connector.

9. CHECK POWER TRANSISTOR POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 10.
NO- Repair harness or connector.

10. REPLACE BLOWER MOTOR

Replace blower motor. Blower Motor.
Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 19.

11. CHECK POWER TRANSISTOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 12.
NO- Repair harness or connector.

12. CHECK POWER TRANSISTOR CONTROL SIGNAL

1.Connect power transistor connector.
2.Turn ignition switch ON.
3.Operate mode switch to set VENT position.
4.Change fan speed from 1 to 7, and check voltage between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 15.
NO- GO TO 13.

13. CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect power transistor connector.
3.Connect A/C auto amp. connector.
4.Check continuity between power transistor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 14.
NO- Repair harness or connector.

14. CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR SHORT

Check continuity between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 18.
NO- Repair harness or connector.

15. CHECK BLOWER MOTOR FEEDBACK SIGNAL

Change fan speed from 1 to 7, and check voltage between power transistor harness connector and ground.





Is the inspection result normal?
YES- GO TO 18.
NO- GO TO 16.

16. CHECK BLOWER MOTOR FEEDBACK SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect power transistor connector.
3.Disconnect A/C auto amp. connector.
4.Check continuity between A/C auto amp. harness connector and power transistor harness connector.





Is the inspection result normal?
YES- GO TO 17.
NO- Repair harness or connector.

17. CHECK BLOWER MOTOR FEEDBACK SIGNAL CIRCUIT FOR SHORT

Check continuity between A/C auto amp. harness connector and ground.





Is the inspection result normal?
YES- GO TO 18.
NO- Repair harness or connector.

18. REPLACE POWER TRANSISTOR

Replace power transistor. Manual Air Conditioning.
Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 19.

19. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C auto amp. Removal And Installation.
NO- Repair or replace malfunctioning parts.


Component Inspection (Blower Motor)


1. CHECK BLOWER MOTOR-I

1.Remove blower motor. Blower Motor.
2.Check that there is not any mixing foreign materials in blower motor.
Is the inspection result normal?
YES- GO TO 2.
NO- Remove foreign materials.

2. CHECK BLOWER MOTOR-II

Check that there is not breakage or damage in blower motor.
Is the inspection result normal?
YES- GO TO 3.
NO- Replace blower motor. Blower Motor.

3. CHECK BLOWER MOTOR-III

Check that blower motor turns smoothly.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace blower motor. Blower Motor.


Component Inspection (Blower Relay)


1. CHECK BLOWER RELAY

1.Remove blower relay.





2.Check continuity between blower relay terminals 3 and 5 when the voltage is supplied between terminals 1 and 2.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace blower relay.