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 PROCEDURESPOWER WINDOWS 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 / Vehicle - In Service Mode
- Operate the component: S79D Window Switch - Driver - Pressed & Pulled
- Verify the component works as specified: M74D Window Motor - Driver = Up & Down
- If not the specified state
Refer to: Circuit/System Testing -Test 1
- Go to next step: If the specified state
- If not the specified state
- Operate the component:Passenger Window Switch @ S79D Window Switch - Driver - Pressed & Pulled
- Verify the component works as specified: M74P Window Motor - Passenger = Up & Down
- If not the specified state
Refer to: Circuit/System Testing -Test 2
- Go to next step: If the specified state
- If not the specified state
- Operate the component: S79P Window Switch - Passenger - Pressed & Pulled
- Verify the component works as specified: M74P Window Motor - Passenger = Up & Down
- If not the specified state
Refer to: Circuit/System Testing -Test 3
- Go to next step: If the specified state
- If not the specified state
- All OK.
RENDER: 1.0x
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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.