2002 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Circuit Discretion

Unless the driver's door is opened then closed within 43 seconds after the ignition switch is turned to OFF from ON, the driver door ECU supplies the power source to the master switch at the same time when a signal is transmitted multiply to the passenger door ECU. And then the passenger door ECU supplies the power source to the regulator switch.

NOTE: Power window system has a function with a large-scale body multiplex communications. First of all, inspect the communication function depending on the "how to proceed with troubleshooting", and check there is no abnormality in the communication system. Then finally proceed with the troubleshooting. Also, if the power window system has a malfunction in the jam protection function, the AUTO operations are prohibited. Because of this, confirm the diagnosis code is normal before the troubleshooting.
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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.