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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 464 (Driver Side Junction Block (Body No. 2 Control System) - Diagnosis) >> Problem Symptoms Table >> Illumination Light System:

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
All switch illumination light does not light up.
  1. Power source circuit
  2. Rheostat light control volume circuit
  3. Driver side J/B ECU
  1. POWER SOURCE CIRCUIT 
  2. RHEOSTAT LIGHT CONTROL VOLUME CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Each switch illumination light does not light up.
  1. Illumination light circuit
  2. Driver side J/B ECU
  1. ILLUMINATION (DOOR COURTESY SWITCH SIGNAL) CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Brightness does not change even when rheostat turned. (All)
  1. Rheostat light control volume circuit
  2. Driver side J/B ECU
  1. RHEOSTAT LIGHT CONTROL VOLUME CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Brightness does not change even when rheostat turned. (Meter illumination)
  1. Rheostat light control volume circuit
  2. Combination meter circuit
  3. Driver side J/B ECU
  1. RHEOSTAT LIGHT CONTROL VOLUME CIRCUIT 
  2. COMBINATION METER CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Driver seat belt buckle illumination circuit.
  1. Driver buckle illumination circuit
  2. Driver side J/B ECU
  1. DRIVER BUCKLE ILLUMINATION CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Glove compartment door light does not light up.
  1. Illumination light circuit
  2. Driver side J/B ECU
  1. ILLUMINATION (DOOR COURTESY SWITCH SIGNAL) CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE