INSPECTION PROCEDURE 9: Rear fan switch or rear cooler control panel power supply system
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COMMENTS ON TROUBLE SYMPTOM
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If the rear fan switch or the rear cooler control panel is not energised, the power supply or earth system for them may be defective.
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- Malfunction of the rear fan switch
- Malfunction of the centre room lamp (integrated rear cooler control panel)
- Damaged wiring harness or connector
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STEP 1. Check the rear fan switch.
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Refer to  .
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Q.
Is the rear fan switch in good condition?
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 Go to Step 2.
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 Replace the rear fan switch (Refer to GROUP 52A - Instrument Centre Panel ).
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STEP 2. Voltage measurement at rear cooler control panel 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 RSWG and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check open circuit in rear cooler control panel RSWG line between ignition switch (IG2) and rear cooler control panel connector RSWG terminal.
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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 4. Voltage measurement at rear cooler control panel 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 IG2 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check open circuit in rear cooler control panel IG2 line between joint connector terminal No.1 and rear cooler control panel connector IG2 terminal.
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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 6. Resistance measurement at the rear cooler control panel connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Continuity between terminal E 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 8.
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Go to Step 7.
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STEP 7. Check open circuit in rear cooler control panel E line between rear cooler control panel connector terminal E 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 8. 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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Replace the centre room lamp (integrated rear cooler control panel) (Refer to GROUP 54A - Interior Lamp ).
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