2003 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Jam Protection Pulse Switch (Front)

WARNING: This page is about a different car, the 2002 Lexus GS 430 and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
  1. Inspect the jam protection pulse switch operation.
  2. Connect the positive (+) lead from the TOYOTA electrical tester to terminal No. 3 and the negative (-) lead to terminal No. 5. See CONNECTOR IDENTIFICATION .
  3. On the driver door, connect the positive (+) lead from the battery to terminal No. 1 and the negative (-) lead to terminal No. 2.
  4. On the passenger door, connect the positive (+) lead from the battery to terminal No. 2 and the negative (-) lead to terminal No. 1.
  5. Check that a pulse is generated during the motor running.
  6. Reverse the polarity and check that a pulse is generated.
  7. If a pulse is not generated, replace the motor. See FRONT DOOR POWER WINDOW REGULATOR  under COMPONENT TESTS.
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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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