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.
2008 Scion xB StandardFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
Window defogger system
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Rear Window Defogger System does not Operate | DEF fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE |
| ECU-IG NO 2 fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| HTR-IG fuse | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| Rear window defogger wire | WINDOW DEFOGGER WIRE | |
| Main Body ECU (defogger relay) | REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE | |
| Wire harness | - |
Factory Service Tools
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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.