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 MANUALSCHEVROLET1990CHEVY VAN G20, 4.3 Z, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTWINDOW MOTORS & REGULATORSPOWER WINDOWSTROUBLE SHOOTINGPASSENGER SIDE WINDOW DOES NOT OPERATE WITH MASTER SWITCH
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40
Passenger Side Window Does Not Operate With Master Switch
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40SECTION Passenger Side Window Does Not Operate With Master Switch
- With ignition in RUN or ACC position, check operation of driver's window. If driver's window works, voltage exists in master switch. Place master switch in UP position and check for voltage at Dark Blue wire.
- If voltage does not exist, replace master switch. If voltage exist, check for open between master switch and passenger side 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.