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.
Rear Window Defogger Signal Check
- CHECK REAR WINDOW DEFOGGER SWITCH LAMP
A/C and AV switch self-diagnosis is performed. Refer to A/C AND AV SWITCH SELF-DIAGNOSIS FUNCTION . Does rear window defogger switch light?
- YES: GO TO 2.
- NO: Replace A/C and AV switch.
- CHECK AV COMMUNICATION LINE
AV communication line check is performed. Refer to A/C AND AV SWITCH DOES NOT OPERATE . Is rear window defogger displayed on the display?
- YES: GO TO 3.
- NO: Replace display control unit.
- CHECK CAN COMMUNICATION LINE
CAN communication line check is performed. Refer to CAN COMMUNICATION LINE INSPECTION .
OK or NG
- OK: Check condition of harness and connector.
- NG: In addition, it is necessary to check CAN communication line. Refer to CAN COMMUNICATION LINE INSPECTION .
Use the Manual With the Right Hardware
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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.