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 MANUALSLEXUS1998SC 300REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEPOWER WINDOWSCOMPONENT TESTSWINDOW MOTOR
1998 Lexus SC 300
Window Motor
1998 Lexus SC 300SECTION Window Motor
- Disconnect window motor connector. Apply battery voltage and ground between motor connector terminals. Motor should operate. To reverse motor direction, reverse polarity of voltage to motor. Replace motor if it does not operate.
- If battery voltage to motor continues to be applied after window has stopped moving, a circuit breaker in motor should open in 4-40 seconds and motor should stop. After circuit breaker opens, reverse polarity of voltage to motor.
- Within 60 seconds, motor should move in opposite direction, indicating that circuit breaker has closed. Replace motor as necessary.
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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.