COMMENTS ON TROUBLE SYMPTOM
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.TROUBLESHOOTING HINTS
- Malfunction of the rear window defogger relay
- Malfunction of the rear window defogger
- Damaged the wiring harness or connectors
- Malfunction of the manual air conditioner control panel (A/C-ECU)
Step 2. Measure the voltage at F-04 rear window defogger connector.
- Disconnect F-04 rear window defogger connector, and measure the voltage at the harness side.
- Disconnect C-06 A/C-ECU connector, and earth terminal 1.
- Measure the voltage between terminal 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 14
.NO: Go to Step 3
.Step 4. Measure the voltage at C-206 rear window defogger relay connector.
- Disconnect C-206 rear window defogger relay connector, and measure the voltage at the junction block side.
- Measure the voltage between terminal 5 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 7.NO: Go to Step 5
.Step 6. Check the wiring harness between C-206 rear window defogger relay connector (terminal 5) and the fusible link (1).
NOTE: Prior to the wiring harness inspection, check intermediate connector C-116 <LH drive vehicles>, C-125 <RH drive vehicles>, A-14 <RH drive vehicles>
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 7. Measure the voltage at rear window defogger relay connector C-206.
- Disconnect C-206 rear window defogger relay connector, and measure the voltage at the junction block side.
- Turn the ignition switch to the "ON" position.
- Measure the voltage between terminal 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 10.NO: Go to Step 8
.Step 9. Check the wiring harness between C-206 rear window defogger relay connector (terminal 1) and 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 11. Check the wiring harness between C-206 rear window defogger relay connector (terminal 3) and C-06 A/C-ECU connector (terminal 1).
NOTE: Prior to the wiring harness inspection, check junction block connector C-205, and repair if necessary.
Q: Is the check result normal?
YES:
Go to Step 12.NO: Repair or replace the wiring harness.
Step 13. Check the wiring harness between C-206 rear window defogger relay connector (terminal 4) and F-04 rear window defogger connector (terminal 1).
NOTE: Prior to the wiring harness inspection, check junction block connector C-209 <LH drive vehicles>
and C-221 <RH drive vehicles>, and repair if necessary.
Q: Is the check result normal?
YES:
Replace the manual air conditioner control panel (A/C-ECU).NO: Repair or replace the wiring harness.
Step 14. Measure the resistance at F-01 rear window defogger connector to check the earth circuit to the rear window defogger connector.
- Disconnect F-01 rear window defogger connector, and measure at the wiring harness side.
- Measure the resistance value between terminal 1 and earth.
OK: 2 ohms or less
Q: Is the check result normal?
YES:
Go to Step 17.NO: Go to Step 15
.