2003 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - POWER WINDOW CONTROL SYSTEM

Symptoms Suspected Part
AUTO UP/DOWN function does not operate
  1. Power window regulator motor assy LH (Driver side)
  2. Wire harness
  3. Power window regulator master switch assy
Remote UP/DOWN function does not operate
  1. Power window regulator motor assy LH (Driver side)
  2. Power window regulator master switch assy
  3. Wire harness
Manual UP/DOWN function does not operate on driver side
  1. Power window regulator master switch assy
  2. Power window regulator motor assy LH (Driver side)
  3. Wire harness
Manual UP/DOWN function does not operate on passenger side
  1. Power window regulator switch assy (Passenger side)
  2. Power window regulator motor assy RH (Passenger side)
  3. Wire harness
Manual UP/DOWN function does not operate on rear LH
  1. Power window regulator switch assy rear (Rear LH)
  2. Power window regulator motor assy LH (Rear LH)
  3. Wire harness
Manual UP/DOWN function does not operate on rear RH
  1. Power window regulator switch assy rear (Rear RH)
  2. Power window regulator motor assy RH (Rear RH)
  3. Wire harness
Power windows do not operate at all
  1. POWER fuse
  2. Power window relay
  3. Power window regulator master switch assy
  4. Wire harness
  5. Instrument panel J/B assy
Door glass goes down during AUTO UP operation
  1. Front door glass run LH
  2. Front door window glass LH
  3. Front door window regulator sub-assy LH
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:

  • • 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.