Inspection Procedure 9: The rear window defogger does not
work.
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If the rear window defogger does not operate
when the rear window defogger switch is turned on, the rear window defogger
relay system may be defective.
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- Malfunction of the A/C-ECU
- Malfunction of the rear window defogger relay
- Damaged the wiring harness or connectors
- Malfunction of the rear window defogger
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STEP 1. Check the A/C and outside/inside air selection
damper control motor operation.
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Q.
Do the A/C and outside/inside air selection damper control
motor work normally?
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 Go to Step 2.
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 Refer
to Inspection procedure 14 "Malfunction of the A/C-ECU power supply
system  ."
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STEP 2. Connector check: D-08 A/C-ECU connector and G-15 rear
window defogger
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
the connector.
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STEP 3. Voltage measurement at G-15 rear window defogger
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)Disconnect A/C-ECU connector D-08 and earth terminal
15.
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(4)Measure the 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 4.
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STEP 4. Connector check: D-407 rear window defogger relay connector
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the connector.
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STEP 5. Check the rear window defogger relay continuity.
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Refer to .
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Q.
Is the rear window defogger relay in good condition?
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Go to Step 6.
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Replace the rear window defogger
relay.
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STEP 6. Voltage measurement at D-407 rear window defogger relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Measure the voltage between terminal 5 and body
earth.
OK: System voltage
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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 the wiring harness between D-405 rear window defogger
relay connector terminal No.5 and the fusible link (2).
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Prior to the wiring harness inspection, check
intermediate connectors D-240, and junction block connector D-404, and
repair if necessary.
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- Check the rear window defogger relay power supply line for open or
short circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 8. Voltage measurement at D-407 rear window defogger relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Turn the ignition switch to the "ON" earth
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 the wiring harness between D-403 rear window defogger
relay connector No.1 and ignition switch (IG2).
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| note |
Prior to the wiring harness inspection, check
junction block connector D-403, and repair if necessary.
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- Check the rear window defogger power supply line for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 10. Check the wiring harness between D-407 rear window defogger
relay connector No.3 and D-08 A/C-ECU connector No.15.
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| note |
Prior to the wiring harness inspection, check
junction block connector C-205, and repair if necessary.
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- Check the rear window defogger power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 11. Check the wiring harness between D-407 rear window defogger
relay connector No.4 and G-15 rear window defogger connector
No.1.
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| note |
Prior to the wiring harness inspection, check
junction block connector D-422 <RHD> or D-409 <LHD>
and intermediate connector D-220 <LHD> E-105, and repair if
necessary.
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- Check the rear window defogger relay line for open or short
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 12. Connector check: G-04 rear window defogger
connector
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Q.
Is the check result normal?
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Go to Step 13.
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Repair
the connector.
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STEP 13. Resistance measurement at G-04 rear window defogger
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 1 and body
earth.
OK: 2Ω or less
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Q.
Is the check result normal?
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Go to Step 15.
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Go to Step 14.
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STEP 14. Check the wiring harness between G-02 rear window defogger
connector terminal No.1 and earth.
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- Check the rear window defogger earth line for open or short
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
or replace the wiring harness.
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STEP 15. Check the rear window defogger.
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Refer to GROUP 54A, Rear Window rear window
defogger Switch Inspection .
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Q.
Does the rear window defogger work normally?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the rear window defogger.
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