Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Problem Symptoms Table
HINT:
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Rear window defogger
| Symptom | Suspected area | See |
|---|---|---|
| Rear window defogger system does not operate | 1. DEFOG H-fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE |
| 2. AM2 fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 3. LH-IG fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 4. DEFOG relay | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 5. Power source control ECU | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 6. Multi-display | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 7. Air conditioning amplifier (A/C ECU) | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 8. ECM | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| 9. Wire harness | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.