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.
2000 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
One-Touch System Circuit
- Disconnect driver door ECU harness connector D-12. Using an ammeter, connect positive lead to terminal No. 9 (Yellow wire) of driver door ECU harness connector D-12, and negative lead to negative terminal of battery. See Fig 1. Using a jumper wire, connect battery positive to terminal No. 18 (Yellow wire) at ECU harness connector D-12.
- As window travels downward, amperage should be about 7 amps. Ensure amperage increases to 14.5 amps or greater when window reaches end of travel. With voltage still applied, amperage should decrease to less than one amp within 4-90 seconds as thermistor inside window motor opens. If operation is not as specified, replace window motor.
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.