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 MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEPOWER WINDOWSTESTINGWINDOW CONTROL SWITCH TEST
1990 Pontiac Grand Prix STE, 3.1 V
Window Control Switch Test
1990 Pontiac Grand Prix STE, 3.1 VSECTION Window Control Switch Test
- Connect test light between Pink wire in switch connector and ground. If light does come on, check power feed wire. Locate wires to motor.
- Using jumper wire, connect Pink wire in switch connector between one motor wire and ground. Motor should operate. Reverse wires and retest. If motor operates properly, replace window control switch. If not, test motor.
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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.