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.
2001 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Headlight Circuit
NOTE:
If LEXUS scan tool is available, start test from step 1. If this scan tool is not available, start test from step 2.
- Using scan tool, operate headlight in ACTIVE TEST. If headlight does not operate, go to next step. If headlight operates, go to next test listed in BODY NO. 2 CONTROL SYSTEM table under TROUBLE SHOOTING .
- Check H-LP HI fuse located in engine room junction block. Replace fuse as necessary. If fuse is okay, ensure ignition is off. Disconnect body No. 5 ECU connector. Measure voltage between connector terminals No. 12 and 25. See PIN VOLTAGE TESTS . If 10-14 volts are present, go to next test listed in BODY NO. 2 CONTROL SYSTEM table under TROUBLE SHOOTING . If 10-14 volts are not present, check headlight bulb. Replace bulb as necessary. If bulb is okay, check circuits for faults between headlights, body No. 5 ECU and battery. See WIRING DIAGRAMS . Repair or replace as necessary.
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.