INSPECTION PROCEDURE 4: The blower does not work <Rear side>
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COMMENTS ON TROUBLE SYMPTOM
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If the rear blower motor does not run, the rear blower motor circuit system may be defective.
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- Malfunction of the fuse
- Malfunction of the fusible link
- Malfunction of the rear blower relay
- Malfunction of the rear blower motor
- Malfunction of the rear fan switch
- Malfunction of the rear blower power transistor
- Malfunction of the centre room lamp (integrated rear cooler control panel)
- Damaged wiring harness or connector
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STEP 1. Check the fuse (BF2).
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Q.
Is the fuse (BF2) in good condition?
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 Go to Step 3.
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 Go to Step 2.
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STEP 2. Check short circuit in rear blower motor line between rear blower relay and rear blower motor connector.
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Q.
Is the check result normal?
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Replace the fuse (BF2).
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Repair or replace the connector(s) or wiring harness.
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STEP 3. Check the fusible link (5).
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Q.
Is the fusible link (5) in good condition?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check short circuit in fusible link line between fuse (XX) and fusible link (5).
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Q.
Is the check result normal?
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Replace the fusible link (5).
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Repair or replace the connector(s) or wiring harness.
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STEP 5. Check the rear blower relay.
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Refer to  .
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Q.
Is the rear blower relay in good condition?
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Go to Step 6.
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Replace the rear blower relay.
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STEP 6. Check the rear blower motor.
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Refer to .
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Q.
Is the rear blower motor in good condition?
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Go to Step 7.
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Replace the rear blower motor (Refer to ).
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STEP 7. Check the rear blower power transistor.
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Refer to .
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Q.
Is the rear blower power transistor in good condition?
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Go to Step 8.
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Replace the rear blower power transistor (Refer to ).
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STEP 8 Voltage measurement at rear 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 10.
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Go to Step 9.
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STEP 9. Check open circuit in rear blower motor line between rear blower relay and rear 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 10. Resistance measurement at the rear blower motor 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 12.
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Go to Step 11.
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STEP 11. Check open circuit in rear blower motor earth line between rear blower motor 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 12. Voltage measurement at rear blower relay 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 14.
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Go to Step 13.
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STEP 13. Check open circuit in rear blower relay line between FUSE (16) and rear blower relay 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 14. Resistance measurement at the rear 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 16.
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Go to Step 15.
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STEP 15. Check open circuit in rear blower relay earth line between ignition switch (IG2) switch 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 16. Recheck the trouble symptom.
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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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Refer to "Inspection Procedure 9 Rear cooler control panel power supply system" .
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