2001 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Fail-Safe Function

WARNING: This page is about a different car, the 2002 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

The Headlight Leveling Control ECU performs the fail-safe when detecting following troubles.

At this it lights the warning light ("HEADLIGHT LEVELING") on the combination meter (multi-information display

Fig 1: ECU Fail-Safe Function Chart
G01145384Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002

Recovery condition (The warning light goes off.)

  • In case of 1, 2 and 3: ignition switch OFF
  • In case of 4 and 5: ignition switch OFF or signal lever error cancellation
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.