2005 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

Use table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" . Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

PROBLEM SYMPTOMS TABLE - POWER WINDOW CONTROL SYSTEM

Symptom Suspected Area
Power window does not operate on driver side
  1. Power window regulator master switch assy
  2. Power window regulator motor assy front LH
  3. Wire harness
  4. Driver door ECU power source circuit
Power window does not operate on passenger side
  1. Power window regulator switch assy
  2. Power window regulator motor assy front RH
  3. Wire harness
  4. Passenger door ECU power source circuit
Remote UP/DOWN function does not operate
  1. Power window regulator master switch assy
  2. Power window regulator motor assy front RH
  3. Wire harness
  4. Driver door ECU power source circuit
  5. Passenger door ECU power source circuit
AUTO UP operation does not fully close power window (jam protection function is activated)
  1. Power window regulator motor assy front LH
  2. Power window regulator assy front LH
  3. Door glass run
  4. Driver door ECU power source circuit
Power windows can be operated after ignition switch is turned OFF even if operative conditions are not met
  1. Power window regulator master switch assy
  2. Power window regulator assy front LH
  3. Unlock warning switch assy
  4. Front door courtesy lamp switch assy LH
  5. Wire harness
  6. Driver door ECU power source circuit
  7. Transponder key ECU power source circuit
Driver side door key and transmitter do not operate power window system
  1. Transmitter
  2. Door control receiver
  3. Wire harness
  4. Driver door ECU power source circuit
  5. Theft warning ECU power source circuit
Factory Service Tools

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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.

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