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 MANUALSCHEVROLET1983SUBURBAN C20, 5.7 M, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTWINDOW MOTORS & REGULATORSPOWER WINDOWS - TAILGATETESTING & TROUBLE SHOOTINGWINDOW WILL NOT CLOSE FROM KEY SWITCH, OTHERWISE OPERATES
1983 Chevrolet Suburban C20, 5.7 M, Standard
Window Will Not Close From Key Switch, Otherwise Operates
1983 Chevrolet Suburban C20, 5.7 M, StandardSECTION Window Will Not Close From Key Switch, Otherwise Operates
- With ignition switch "ON" and tailgate door open, place key switch in "UP" position. Using a grounded 12-volt test lamp, probe Lt. Blue wire at key switch. If lamp does not light, replace key switch. If lamp lights, probe Lt. Blue wire at cutout switch.
- If lamp does not light, check for open Lt. Blue wire between key switch and cutout switch. If lamp lights, check for open in Lt. Blue wire between cutout switch and window motor. If wire is okay, replace cutout switch.
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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.