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Front Blower Motor Diagnosis Procedure





BLOWER MOTOR


Front Blower Motor Diagnosis Procedure

SYMPTOM: Blower motor operation is malfunctioning under starting blower speed control.





1.DIAGNOSTIC PROCEDURE
1. Turn ignition switch ON.
2. Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
YES or NO
YES >> Inspection End.
NO >> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
2.CHECK FUSES
1. Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to Fuse and Fusible Link Box.
2. Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to Fuse Block-Junction Box (J/B).
Is inspection result normal?
YES >> GO TO 3.
NO >> GO TO 8.
3.CHECK FRONT BLOWER MOTOR POWER SUPPLY





1. Turn ignition switch OFF.
2. Disconnect front blower motor harness connector.
3. Turn ignition switch ON.
4. Select any front blower speed except OFF.
5. Check voltage between front blower motor harness connector M62 terminal 2 and ground.

2 - Ground : Battery voltage

Is inspection result normal?
YES >> GO TO 12.
NO >> GO TO 4.
4.CHECK FRONT BLOWER MOTOR RELAY
1. Turn Ignition switch OFF.
2. Check front blower motor relay. Refer to Front Blower Motor Component Inspection.
Is inspection result normal?
YES >> GO TO 5.
NO >> Replace front blower motor relay.
5.CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)





Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.






Is inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)





1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness connector E54 terminal 1 and ground.






Is inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace harness as necessary.
7.CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR





1. Turn ignition switch OFF.
2. Check continuity between front blower motor relay harness connector E54 terminals 6 and 3 and front blower motor harness connector M62 terminal 2.

3, 6 - 2 : Continuity should exist.

Is inspection result normal?
YES >> Repair open front blower motor relay ground circuit.
NO >> Repair harness or connector between the front blower motor relay and the front blower motor.
8.REPLACE FUSE
Refer to .
Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO
YES >> GO TO 10.
NO >> GO TO 9.
9.REPLACE FUSE
Refer to .
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES >> Repair or replace harness as necessary.
NO >> Inspection End.
10.CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.





3. Check continuity between front blower motor harness connector M62 terminal 2 and ground.

2 - Ground : Continuity should not exist.

Is inspection result normal?
YES >> GO TO 11.
NO >> Repair or replace harness as necessary.
11.CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT





1. Disconnect front blower motor relay connector.
2. Check continuity between the front blower motor relay harness connector E54 terminal 7 and terminal 5 and ground.

7, 5 - Ground : Continuity should not exist.

Is inspection result normal?
YES >> Check front blower motor. Refer to "Front Blower Motor Diagnosis Procedure".
NO >> Repair harness or connector.
12.CHECK FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check front blower motor. Refer to Front Blower Motor Component Inspection.
Is inspection result normal?
YES >> GO TO 13.
NO >> Replace front blower motor. Refer to .
13.CHECK FRONT BLOWER MOTOR RESISTOR
Check front blower motor resistor. Refer to Front Blower Motor Component Inspection.
Is inspection result normal?
YES >> GO TO 14.
NO >> Replace front blower motor resistor. Refer to Service and Repair.
14.CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to Front Blower Motor Component Inspection.
Is inspection result normal?
YES >> GO TO 15.
NO >> Replace front blower switch. Refer to .
15.CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR





1. Disconnect front blower motor resistor harness connector.
2. Check continuity between front blower motor connector M62 (A) terminal 1 and front blower motor resistor harness connector M121 (B) terminal 3.





Is inspection result normal?
YES >> Repair harness or connector between front blower switch connector M51 terminal 8 and ground.
NO >> Repair harness or connector between front blower motor resistor and front blower motor.
16.CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to Front Blower Motor Component Inspection.
Is inspection result normal?
YES >> Repair harness or connector between front blower motor switch connector M51 terminal 8 and front blower motor resistor connector M121 terminal 3.
NO >> Replace front blower switch. Refer to .
SYMPTOM: Blower motor operation is malfunctioning.
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