Front Blower Motor

FRONT BLOWER MOTOR

Diagnosis Procedure


1. CHECK FUSE

1.Turn ignition switch OFF.
2.Check 15A fuse [No. 21 and 22, located in fuse block (J/B)].
NOTE:
Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES- GO TO 2.
NO- Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2. CHECK FRONT BLOWER MOTOR POWER SUPPLY

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





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 6.

3. CHECK FRONT BLOWER MOTOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between front blower motor harness connector and ground.





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

4. CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT

1.Disconnect A/C auto amp. connector.
2.Check continuity between front blower motor harness connector and A/C auto amp. harness connector.





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

5. CHECK FRONT BLOWER MOTOR CONTROL SIGNAL

1.Reconnect front blower motor connector and A/C auto amp. connector.
2.Turn ignition switch ON.
3.Operate MODE switch to set air outlet to VENT.
4.Change fan speed from Lo to Hi, and check duty ratios between front blower motor harness connector and ground by using an oscilloscope.
NOTE:
Calculate drive signal duty ratio as shown in the figure.





T2 = Approx. 1.6 ms





Is the inspection result normal?
YES- Replace front blower motor. Removal And Installation.
NO- Replace A/C auto amp. Service and Repair.

6. CHECK BLOWER RELAY GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between fuse block (J/B) harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.

7. CHECK BLOWER RELAY

Check blower relay. .
Is the inspection result normal?
YES- Repair harness or connector between front blower motor and fuse block (J/B).
NO- Replace blower relay.


Component Inspection (Front Blower Motor)


1. CHECK FRONT BLOWER MOTOR-I

1.Remove front blower motor.
2.Check that there is not any mixing foreign object in the front blower motor.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace front blower motor. Removal And Installation.

2. CHECK FRONT BLOWER MOTOR-II

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

3. CHECK FRONT BLOWER MOTOR-III

Check that front blower motor turns smoothly.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace front blower motor. Removal And Installation.


Component Inspection (Blower Relay)


1. CHECK BLOWER RELAY

1.Turn ignition switch OFF.
2.Remove blower relay.





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





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