1999 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Jam Protection Limit Switch Circuit

  1. If Lexus hand-held tester is not available, go to next step. If Lexus hand-held tester is available, check jam protection limit switch using DATA LIST mode. If jam protection limit switch is okay, perform check for next fault listed under appropriate symptom. See TROUBLE SHOOTING . If jam protection limit switch is not okay, go to next step.
  2. Check jam protection limit switch. See JAM PROTECTION LIMIT SWITCH  under COMPONENT TESTS. Repair as necessary. If jam protection limit switch is okay, go to next step.
  3. Check wire harness and connectors between jam protection limit switch and driver door ECU. See WIRING DIAGRAMS . Repair as necessary. If wire harness and connectors are okay, perform check for next fault listed under appropriate symptom. See TROUBLE SHOOTING .
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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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