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.
1993 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Circuit Breaker Operation Test
- Unplug power window switch connector. Using fused jumper wire, connect battery voltage to switch connector terminal No. 5. Connect jumper wire from switch connector terminal No. 1 to ground. See Figure. Raise window to fully closed position. Continue to apply voltage. Ensure there is circuit breaker operation within 4-40 seconds.
- Reverse jumper jumper wires. Window should begin to go down within 60 seconds. Replace motor assembly if operation is not as specified.
Factory Service Tools
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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.
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