2001 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Stoplight Switch 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.
  1. Using scan tool, check stoplight switch using DATA LIST. If stoplight switch is faulty, go to next step. If stoplight switch is okay, go to next test listed in BODY NO. 2 CONTROL SYSTEM  table under TROUBLE SHOOTING .
  2. Check stoplight switch. See STOPLIGHT SWITCH  under COMPONENT TESTS. Replace stoplight switch as necessary. Retest system operation. If stoplight switch is okay, go to next step.
  3. Check circuits for faults between stoplight switch, body control ECU and battery. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, go to next test listed in BODY NO. 2 CONTROL SYSTEM  table under TROUBLE SHOOTING .
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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