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.
Check Rear Window Defogger Signal
- 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 "UNABLE TO OPERATE SYSTEM WITH A/C AND AV SWITCH "
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 CHECK ".
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 CHECK ".
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.