[55A] HEATER, AIR CONDITIONER AND VENTILATION - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 4: Blower Fan and Motor do not Turn.PRINT PAGE / INDEX / PRIOR / NEXT
INSPECTION PROCEDURE 4: Blower Fan and Motor do not Turn.
COMMENTS ON TROUBLE SYMPTOM
If the blower fan and motor does not turn when the blower switch is operated, the blower switch may be defective.
TROUBLESHOOTING HINTS
  • Malfunction of the blower relay
  • Malfunction of the blower switch
  • Damaged the wiring harness or connectors
  • Malfunction of the blower motor
DIAGNOSIS
Step 1. Check that the blower motor operates when the blower switch is moved to the "4 (HI) " position.
  1. Turn the ignition switch to the "ON" position.
  1. Turn the blower switch to the "4 (HI) " position.
Q: Is the check result normal?
YES:  Refer to Inspection procedure 5 "Blower air amount cannot be changed ."
NO:  Go to Step 2.
Step 2. Measure the resistance at C-12 blower motor connector in order to the earth circuit to the blower motor.
  1. Disconnect C-12 blower motor connector, and measure the voltage at the wiring harness side.
  1. Measure the resistance value between terminal 2 and earth.
    2. OK: 2 ohms or less
Q: Is the check result normal?
YES:  Go to Step 5.
NO:  Go to Step 3.
Step 3. Connector check: C-12 blower motor connector
Q: Is the check result normal?
YES:  Go to Step 4.
NO:  Repair or replace the connector.
Step 4. Check the wiring harness between C-12 blower motor connector (terminal 2) and earth.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 5. Measure the voltage at C-12 blower motor connector.
  1. Disconnect C-12 blower motor connector, and measure the voltage at the wiring harness side.
  1. Turn the ignition switch to the "ON" position.
  1. Turn the blower switch to the "4 (HI) " position.
  1. Measure the voltage between terminal 1 and earth.
    2. OK: System voltage
Q: Is the check result normal?
YES:  Go to Step 21.
NO:  Go to Step 6.
Step 6. Check the blower relay continuity.
Refer to .
Q: Is the check result normal?
YES:  Go to Step 7.
NO:  Replace the blower relay.
Step 7. Measure the voltage at C-207 blower relay connector.
  1. Disconnect C-207 blower relay connector, and measure the voltage at the junction block side.
  1. Turn the ignition switch to the "ON" position.
  1. Measure the voltage between terminal 1 and earth.
    2. OK: System voltage
Q: Is the check result normal?
YES:  Go to Step 10.
NO:  Go to Step 8.
Step 8. Connector check: C-207 blower relay connector
Q: Is the check result normal?
YES:  Go to Step 9.
NO:  Repair or replace the connector.
Step 9. Check the wiring harness between C-207 blower relay connector (terminal 1) and the ignition switch (IG2).
NOTE: Prior to the wiring harness inspection, check junction block connector C-203, and repair if necessary.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00-How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 10. Measure the resistance at C-207 blower relay connector.
  1. Disconnect C-207 blower relay connector, and measure the voltage at the wiring harness side.
  1. Measure the resistance value between terminal 3 and earth.
    2. OK: 2 ohms or less
Q: Is the check result normal?
YES:  Go to Step 13.
NO:  Go to Step 11.
Step 11. Connector check: blower relay connector C-207.
Q: Is the check result normal?
YES:  Go to Step 12.
NO:  Repair or replace the connector.
Step 12. Check the wiring harness between blower relay connector C-207 (terminal 3) and earth.
NOTE: Prior to the wiring harness inspection, check junction block connectors C-205, and repair if necessary.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 13. Measure the voltage at C-207 blower relay connector.
  1. Disconnect C-207 blower relay connector, and measure the voltage at the junction block side.
  1. Measure the voltage between terminal 5 and earth.
    2. OK: System voltage
Q: Is the check result normal?
YES:  Go to Step 16.
NO:  Go to Step 14.
Step 14. Connector check: C-207 blower relay connector
Q: Is the check result normal?
YES:  Go to Step 15.
NO:  Repair or replace the connector.
Step 15. Check the wiring harness between C-207 blower relay connector (terminal 5) and fusible link (1).
NOTE: Prior to the wiring harness inspection, check intermediate connectors C-116 <LH drive vehicles>, C-125 <RH drive vehicles>, A-14 <RH drive vehicles> and junction block connector C-204, and repair if necessary.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 16. Check the blower switch continuity.
Refer to .
Q: Is the check result normal?
YES:  Go to Step 17.
NO:  Replace the blower switch.
Step 17. Connector check: C-08 blower switch connector and C-207 blower relay connector
Q: Is the check result normal?
YES:  Go to Step 18.
NO:  Repair or replace the connector.
Step 18. Check the wiring harness between C-08 blower switch connector (terminal 2) and C-207 blower relay connector (terminal 4).
NOTE: Prior to the wiring harness inspection, check junction block connectors C-203, and repair if necessary.
Q: Is the check result normal?
YES:  Go to Step 19.
NO:  Repair the wiring harness.
Step 19. Connector check: C-12 blower motor connector and C-08 blower switch connector
Q: Is the check result normal?
YES:  Go to Step 20.
NO:  Repair or replace the connector.
Step 20. Check the wiring harness between C-12 blower motor connector (terminal 1) and C-08 blower switch connector (terminal 6).
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00-How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 21. Check the blower fan and motor operation.
When battery voltage is applied between the terminals, check that the motor operates.
Also check that there is no abnormal.
Q: Is the check result normal?
YES:  Replace the blower motor..
NO:  The trouble can be an intermittent malfunction (Refer to GROUP 00-How to Cope with Intermittent Malfunction ).
[55A] HEATER, AIR CONDITIONER AND VENTILATION - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 4: Blower Fan and Motor do not Turn.PRINT PAGE / INDEX / PRIOR / NEXT
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