System Operation Check

1993 Lexus LS 400SECTION System Operation Check

If system is functioning normally, AIR BAG indicator light should light steadily for about 6 seconds when ignition switch is first turned to ACC or ON position. If AIR BAG indicator light does not function as described, perform diagnostics.

SIR system faults are usually due to a disconnected/loose electrical connector caused by previous service on vehicle. Always check Yellow SIR connector at base of steering column and behind glove box.

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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.