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Problem Symptoms Table: Others:

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
OTHERS

Symptom Suspect Area See Section
Light auto turn off system does not sound a buzzer.
  1. Door courtesy light and courtesy switch circuit
  2. Driver side J/B ECU
  3. Driver door ECU
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Key remainder system does not sound a buzzer.
  1. Door courtesy light and courtesy switch circuit
  2. Combination meter ECU
  3. Driver door ECU
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE