2003 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Power Window Control System

This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.

PROBLEM SYMPTOMS - POWER WINDOW CONTROL SYSTEM

Symptom Suspect Area Go To
All the power windows do not operate. (Power Door Lock System is normal.)
  1. Power Window Master Switch
  2. Wire Harness
  3. Body ECU
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
Only the driver's window does not operate.
  1. Power Window Master Switch
  2. Power Window Switch
  3. Power Window Motor
  4. Wire Harness
  1. INSPECTION
  2. INSPECTION
  3. INSPECTION
  4. -
"Window lock function" does not operate. Power Window Master Switch INSPECTION
Power window control system abnormal operation. TROUBLESHOOTING TROUBLESHOOTING
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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