1998 Lexus GS 400FACTORY OEM SERVICE PROCEDURE

Anti-Theft Indicator

Disconnect indicator light 7-pin connector. Connect battery positive lead to terminal No. 2 (Violet wire) and negative battery lead to terminal No. 5 (White/Black wire). See Fig 1. If indicator light does not come on, replace light and retest system operation. If indicator light comes on, repair or replace wire harness and connectors between indicator light, body ECU No. 1 and combination meter (instrument cluster).

Fig 1: Testing Anti-Theft Indicator Light
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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.