Diagnosis Procedure
BLOWER MOTOR CONTROL SYSTEM
Front Blower Motor Diagnosis Procedure
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting blower speed control.
1.CHECK FUSES
Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)].
Fuses are good.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 8.
2.CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Press the A/C switch.
5. Press the front blower control "+" switch to maximum speed.
6. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
2 - Ground : Battery voltage
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 3.
3.CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor relay.
3. Check voltage between front blower motor relay harness connector E22 terminals 5, 7 and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to Front Blower Motor Component Inspection.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace front blower motor relay.
5.CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connector E22 terminals 3, 6 and front blower motor harness connector
M62 terminal 2.
3, 6 - 2 : Continuity should exist.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect variable blower control harness connector.
2. Check continuity between front blower motor relay harness connector E22 (A) terminals 3, 6 and variable blower control harness connector M122 (B) terminal 4.
3, 6 - 4 : Continuity should exist.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness connector E22 terminal 1 and ground.
1 - Ground : Battery voltage
Is the inspection result normal?
YES >> Repair front blower motor ground circuit or connector.
NO >> Repair harness or connector.
8.REPLACE FUSES
Replace fuses.
Does the fuse blow?
YES >> � If fuse blows without activating the front blower motor, repair short between fuse and front blower motor relay.
- If fuse blows activating the front blower motor, GO TO 9.
NO >> Inspection End.
9.CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector, front blower motor relay and variable blower control connector.
3. Check continuity between variable blower control harness connector M122 terminal 4 and ground.
4 - Ground : Continuity should not exist.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair harness or connector.
10.CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to Front Blower Motor Component Inspection.
Is the inspection result normal?
YES >> Replace variable blower control (front). Refer to Removal and Replacement.
NO >> Replace front blower motor. Refer to .
11.CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to Component Inspection.
Is the inspection result normal?
YES >> GO TO 12.
NO >> Replace front blower motor. Refer to .
12.CHECK BLOWER MOTOR GROUND CIRCUIT
1. Disconnect variable blower control (front) connector.
2. Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connector M122 (A) terminal 2.
1 - 2 : Continuity should exist.
Is the inspection result normal?
YES >> GO TO 13.
NO >> Repair harness or connector.
13.CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect front blower motor relay.
2. Check continuity between front blower motor relay harness connector E22 (A) terminals 3, 5 and variable blower control harness connector M122 (B) terminal 4.
3 - 4 : Continuity should exist.
Is the inspection result normal?
YES >> GO TO 14.
NO >> Repair harness or connector.
14.CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
Check continuity between variable blower control harness connector
M122 terminal 1 and ground.
1 - Ground : Continuity should exist.
Is the inspection result normal?
YES >> GO TO 15.
NO >> Repair harness or connector.
15.CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Reconnect all disconnected component connectors.
2. Disconnect A/C auto amp. connector.
3. Turn ignition switch ON.
4. Press the blower (+) switch to maximum speed.
5. Check voltage between A/C auto amp. harness connector M49 terminal 13 and ground.
13 - Ground : Approx. 4.5V
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to .
NO >> GO TO 16.
16.CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT FOR OPEN
1. Disconnect variable blower control connector.
2. Check continuity between A/C auto amp. harness connector M49 (B) terminal 13 and variable blower control harness connector M122 (A) terminal 3.
13 - 3 : Continuity should exist.
Is the inspection result normal?
YES >> Replace variable blower control (front). Refer to Removal and Replacement.
NO >> Repair harness or connector.