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.
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HOMESERVICE MANUALSCHEVROLET2018SONIC LS, 1.8L ENG VIN H, AUTOMATIC TRANSREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/SYSTEM DESCRIPTION
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic Trans
Circuit/System Description
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic TransSECTION Circuit/System Description
For an overview of the component/system, refer to: Rear Window Defogger Description and Operation
| Circuit | Description |
|---|---|
| B+ - Relay Switch | Supplied from a fuse. |
| Control - E18 Rear Defogger Grid | The output circuit is switched to 12 V to activate the component. |
| Control - Relay Coil | The output circuit is switched to 12 V to activate the component. |
| Ground - E18 Rear Defogger Grid | Chassis Ground |
| Ground - Relay Coil | Chassis Ground |
| Component | Description |
|---|---|
| KR5 Rear Defogger Relay | A relay is a switch that is actuated by a solenoid. |
| E18 Rear Defogger Grid | Window defoggers are parallel resistive conductors in or on the glass that heat up when electric power is applied. |
| K33 HVAC Control Module | The control module controls a series of actuators to ensure optimal heating, ventilation and air conditioning of the passenger compartment. The control module does this by reading values from a variety of sensors and interprets the data and adjusts the actuators accordingly. |
| K9 Body Control Module | The module controls various vehicle functions like lighting, central door locking, power windows, etc. |
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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.