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.
System Description
- GENERAL
The defogger system thin heater wires are attached to the rear window and defog the rear window surface quickly. The indicator light illuminates while the system is operating. The system automatically turns off after approximately 15 minutes.
- FUNCTION OF MAIN COMPONENT COMPONENTS FUNCTION CHART
Component Outline Defogger switch Located on the air conditioning control assembly*1 or multi-display*2, it detects defogger switch operation and transmits signals to the air conditioning amplifier through the LIN communication line*1 or CAN communication line*2. Defogger relay Receives rear window defogger activation request signals from the air conditioning amplifier and supplies power to the rear window defogger. Rear window defogger Receives power from the defogger relay and heats the defogger wire. HINT:
*1: w/o Multi-display
*2: w/Multi-display - DESCRIPTION FUNCTION DESCRIPTION CHART
Function Outline Defog rear window surface - The defogger relay receives rear window defogger activation request signals from the air conditioning amplifier and defogs the rear window surface.
- Receives power from the defogger relay and heats the defogger wire.
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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.
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