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Illumination Light System:

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.
ILLUMINATION LIGHT SYSTEM

Symptom Suspect Area See Section
Door courtesy light does not light up.
  1. Door courtesy light and courtesy switch circuit
  2. Driver door ECU
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Outer foot light does not light up (in outer mirror).
  1. Outer foot light circuit
  2. Driver door ECU
  1. OUTER FOOT LIGHT CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Inside handle illumination does not light up.
  1. Inside handle illumination circuit
  2. Driver door ECU
  1. INSIDE HANDLE ILLUMINATION CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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