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Diagnosis Procedure





BLOWER MOTOR CONTROL SYSTEM


Front Blower Motor Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
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 20A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Fuse Block - Junction Box (J/B).

Fuses are good.

Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 7.
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 10.
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. Turn ignition switch ON.
4. Check voltage between front blower motor relay harness connector M107 terminal 5 and ground.

5 - Ground : Battery voltage

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. 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 M107 terminal 3 and front blower motor harness connector M62 terminal 2.

3 - 2 : Continuity should exist.

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





1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness connector M107 terminal 2 and ground.

2 - Ground : Battery voltage

Is the inspection result normal?
YES - Repair front blower motor ground circuit or connector.
NO - Repair harness or connector.
7.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 8.
NO - Inspection End.
8.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 9.
NO - Repair harness or connector.
9.CHECK FRONT BLOWER MOTOR
Check front blower motor. Component Inspection.
Is the inspection result normal?
YES - Replace variable blower control (front). Removal and Replacement.
NO - Replace front blower motor. Removal and Installation.
10.CHECK FRONT BLOWER MOTOR
Check front blower motor. Component Inspection.
Is the inspection result normal?
YES - GO TO 11.
NO - Replace front blower motor. Removal and Installation.
11.CHECK BLOWER MOTOR GROUND CIRCUIT
1. Disconnect variable blower control 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 12.
NO - Repair harness or connector.
12.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 M107 (A) terminals 3 and variable blower control harness connector M122 (B) terminal 4.

3 - 4 : Continuity should exist.

Is the inspection result normal?
YES - GO TO 13.
NO - Repair harness or connector.
13.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 14.
NO - Repair harness or connector.
14.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. Service and Repair, "Removal and
Installation".
NO - GO TO 15.
15.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. Removal and Replacement.
NO - Repair harness or connector.