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 MANUALSCHEVROLET2020EXPRESS 2500 LS, 2.8L ENG VIN 1REPAIR AND DIAGNOSISBODY & FRAMEFIXED AND MOVEABLE WINDOWSDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1
Circuit/System Verification
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1SECTION Circuit/System Verification
- Ignition ON.
- Verify the rear defogger indicator turns ON and OFF when pressing the rear window defogger switch.
- If the rear defogger indicator does not turn ON and OFF
Refer to Circuit/System Testing - Rear Window Defogger System Inoperative
- Go to next step: If the rear defogger indicator turns ON and OFF
- If the rear defogger indicator does not turn ON and OFF
- Verify the E18L Rear Defogger Grid - Left and E18R Rear Defogger Grid - Right turns ON and OFF when pressing the rear window defogger switch.
- If both E18L Rear Defogger Grid - Left and E18R Rear Defogger Grid - Right do not turn ON and OFF
Refer to Circuit/System Testing - Rear Window Defogger System Inoperative
- If only the E18L Rear Defogger Grid - Left or E18R Rear Defogger Grid - Right does not turn ON and OFF
Refer to Circuit/System Testing - Single Defogger Grid Malfunction
- Go to next step: If both the E18L Rear Defogger Grid - Left and E18R Rear Defogger Grid - Right turns ON and OFF
- If both E18L Rear Defogger Grid - Left and E18R Rear Defogger Grid - Right do not turn ON and OFF
- All OK.
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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.