INSPECTION PROCEDURE 3: The blower does not work <Front side>
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COMMENTS ON TROUBLE SYMPTOM
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If the blower motor does not operate, the blower motor circuit system may be defective.
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- Malfunction of the fuse
- Malfunction of the fusible link
- Malfunction of the blower relay
- Malfunction of the blower motor
- Malfunction of the blower switch
- Malfunction of the A/C fan control resistor
- Malfunction of the heater controller assembly
- Damaged wiring harness or connector
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STEP 1. M.U.T.-III diagnosis code for other systems.
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Use M.U.T.-III to check that the diagnosis code is set in the engine-ECU (Refer to GROUP 13A - Diagnosis Code Chart  ).
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Q.
Is the diagnosis code set?
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 Carry out the diagnosis for the diagnosis code.
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 Go to Step 2.
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STEP 2. Check the fuse (23).
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Q.
Is the fuse (23) in good condition?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check short circuit in blower motor line between blower relay and blower motor connector.
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Q.
Is the check result normal?
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Replace the fuse (23).
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Repair or replace the connector(s) or wiring harness.
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STEP 4. Check the fusible link (2).
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Q.
Is the fusible link (2) in good condition?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check short circuit in fusible link line between fuse (23) and fusible link (2).
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Q.
Is the check result normal?
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Replace the fusible link (2).
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Repair or replace the connector(s) or wiring harness.
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STEP 6. Check the blower relay.
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Refer to .
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Q.
Is the blower relay in good condition?
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Go to Step 7.
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Replace the blower relay.
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STEP 7. Check the blower motor.
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Refer to .
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Q.
Is the blower motor in good condition?
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Go to Step 8.
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Replace the blower motor (Refer to ).
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STEP 8. Check the blower switch.
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Refer to .
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Q.
Is the blower switch in good condition?
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Go to Step 9.
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Replace the heater controller assembly (Refer to ).
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STEP 9. Check the A/C fan control resistor.
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Refer to .
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Q.
Is the A/C fan control resistor in good condition?
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Go to Step 10.
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Replace the A/C fan control resistor (Refer to ).
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STEP 10. Voltage measurement at blower motor connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 1 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 11.
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STEP 11. Check open circuit in blower motor line between blower relay and blower motor connector.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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STEP 12. Resistance measurement at the blower relay connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Continuity between terminal 2 and body earth
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 14.
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Go to Step 13.
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STEP 13. Check open circuit in blower relay earth line between blower relay connector and body earth.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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STEP 14. Voltage measurement at A/C fan control resistor connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 4 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 16.
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Go to Step 15.
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STEP 15. Check open circuit in A/C fan control resistor line between blower motor connector and heater resister connector.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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STEP 16. Voltage measurement at blower switch connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 1, 2, 3 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 18.
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Go to Step 17.
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STEP 17. Check open circuit in blower switch line between A/C fan control resistor connector and blower switch connector.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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STEP 18. Resistance measurement at the blower switch connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Continuity between terminal 3 and body earth
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Go to Step 19.
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STEP 19. Check open circuit in blower switch earth line between blower switch connector and body earth.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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