Front Blower Motor Circuit
TROUBLE DIAGNOSIS
Front Blower Motor Circuit
SYMPTOM: Front blower motor operation is malfunctioning.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Turn blower control dial to "1" position. Blower should operate on low speed.
2. Turn the blower control dial to "2" position, and continue checking blower speed until all speeds are checked.
Can the symptom be duplicated?
YES - GO TO 3.
NO - GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Operational Check.
Can a symptom be duplicated?
YES - How To Perform Trouble Diagnosis For Quick And Accurate Repair.
NO - System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
- GO TO 4.
4.CHECK FRONT BLOWER MOTOR CIRCUIT
Check front blower motor circuit. Refer to "DIAGNOSTIC PROCEDURE FOR FRONT BLOWER MOTOR" .
OK or NG
OK - If the symptom still exists, perform a complete operational check. Operational Check. If other symptoms exist, How To Perform Trouble Diagnosis For Quick And Accurate Repair.
NG - Repair as necessary.
DIAGNOSTIC PROCEDURE FOR FRONT BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
1.CHECK FRONT BLOWER MOTOR OPERATION
1. Turn ignition switch ON.
2. Check front blower motor operation at each fan speed.
OK or NG
OK - Inspection End.
NG -
- Front blower motor does not operate at any speed, GO TO 2.
- Front blower motor does not operate at one or more of the four speeds, GO TO 10.
2.CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between front blower motor harness connector
M62 terminal 1 and ground.
OK or NG
OK - GO TO 6.
NG - Check power supply circuit and 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)]. Description and Operation.
- If fuses are OK, reinstall fuses and GO TO 3.
- If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
3.CHECK BLOWER MOTOR RELAY POWER SUPPLY CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect blower motor relay connector.
3. Turn ignition switch ON.
4. Check voltage between blower motor relay harness connector J-1 terminal 1, 5 and ground.
OK or NG
OK - GO TO 4.
NG - Repair harness or connector.
4.CHECK BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Check continuity between blower motor relay harness connector
J-1 (A) terminal 3 and front blower motor harness connector
M62 (B) terminal 1.
OK or NG
OK - GO TO 5.
NG - Repair harness or connector.
5.CHECK BLOWER MOTOR RELAY GROUND CIRCUIT
Check continuity between blower motor relay harness connector J-1 terminal 2 and ground.
OK or NG
OK - Replace blower motor relay.
NG - Repair harness or connector.
6.CHECK FRONT BLOWER MOTOR
Check continuity between front blower motor terminals 1 and 2.
NOTE:
Ensure that there are no foreign particles inside the A/C unit assembly for a smooth rotation of the front blower motor.
OK or NG
OK - GO TO 7.
NG - Replace front blower motor. Service and Repair.
7.CHECK CIRCUIT CONTINUITY BETWEEN FRONT BLOWER MOTOR AND FRONT AIR CONTROL
1. Disconnect front air control connector.
2. Check continuity between front blower motor harness connector
M62 (A) terminal 2 and front air control harness connector M33
(B) terminal 13.
OK or NG
OK - GO TO 8.
NG - Repair harness or connector.
8.CHECK FAN SWITCH
Check continuity between front air control terminal 9 and 10, 11, 12, 13, 14.
OK or NG
OK - GO TO 9.
NG - Replace front air control. A/C Unit Assembly.
9.CHECK FAN SWITCH GROUND CIRCUIT
Check continuity between front air control harness connector M33 terminal 9 and ground.
OK or NG
OK - Inspection End.
NG - Repair harness or connector.
10.CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND FRONT BLOWER MOTOR
RESISTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor resistor and front air control connectors.
3. Check continuity between front air control harness connector
M33 (A) terminals and front blower motor resistor harness connector M6 (B) terminals.
OK or NG
OK - GO TO 11.
NG - Repair harness or connector.
11.CHECK FAN SWITCH
Check continuity between front air control terminal 9 and 10, 11, 12, 13, 14.
OK or NG
OK - Replace the front blower motor resistor. Service and Repair.
NG - Replace front air control. A/C Unit Assembly.