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Lighting 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.
PROBLEM SYMPTOMS

Symptom Suspect Area See Section
Headlight does not light up. (Low beam)
  1. Light control switch circuit
  2. Headlight relay circuit
  3. Combination switch
  4. Driver side J/B ECU
  1. LIGHT CONTROL SWITCH CIRCUIT
  2. HEADLIGHT RELAY CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Headlight system does not operate. (HI beam or Flash)
  1. Headlight (Hl-beam) circuit
  2. Light control switch circuit
  3. Combination switch
  4. Front light ECU
  5. Driver side J/B ECU
  1. HEADLIGHT CIRCUIT
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Automatic light control system does not operate.
  1. Automatic light control sensor circuit
  2. Combination switch
  3. Front light ECU
  4. Driver side J/B ECU
  1. CIRCUIT INSPECTION 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Both left and right headlight does not light up.
  1. Headlight circuit
  2. Light control switch circuit
  3. Combination switch
  4. Front light ECU
  5. Driver side J/B ECU
  1. HEADLIGHT RELAY CIRCUIT 
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Front fog light does not light up.
  1. Front fog light circuit
  2. Light control switch circuit
  3. Combination switch
  4. Front, light ECU
  5. Driver side J/B ECU
  1. FRONT FOG LIGHT CIRCUIT
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Rear combination light does not light up. (All)
  1. Power source circuit
  2. Combination switch
  3. Driver side J/B ECU
  4. Luggage room J/B ECU
  1. POWER SOURCE CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Both left and right taillight does not light up.
  1. Taillight circuit
  2. Light control switch circuit
  3. Combination switch
  4. Driver side J/B ECU
  5. Luggage room J/B ECU
  1. TAILLIGHT CIRCUIT
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Both left and right stop light does not light up.
  1. Stop light circuit
  2. Combination switch
  3. Driver side J/B ECU
  4. Luggage room J/B ECU
  1. STOP LIGHT CIRCUIT
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Hi-mounted stop light does not light up
  1. Hi-mounted stop light circuit
  2. Combination switch
  3. Driver side J/B ECU
  4. Luggage room J/B ECU
  1. HIGH-MOUNTED STOP LIGHT CIRCUIT
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Back-up light does not light up.
  1. Back-up light circuit
  2. Combination switch
  3. Driver side J/B ECU
  4. Luggage room J/B ECU
  1. BACK-UP LIGHT CIRCUIT
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
License plate light does not light up.
  1. License plate light circuit
  2. Combination switch
  3. Driver side J/B ECU
  4. Luggage room J/B ECU
  1. LICENCE PLATE LIGHT CIRCUIT
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Parking light does not light up.
  1. Parking light circuit
  2. Light control switch circuit
  3. Combination switch
  4. Front light ECU
  5. Driver side J/B ECU
  1. PARKING LIGHT CIRCUIT
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Slide marker light does not light up.
  1. Side maker light circuit
  2. Combination switch circuit
  3. Front light ECU
  4. Driver side J/B ECU
  1. SIDE MARKER LIGHT CIRCUIT
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Light auto turn off system does not operate. (Headlight is normal)
  1. Headlight circuit
  2. Light control switch circuit
  3. Combination switch
  4. Driver side J/B ECU
  1. HEADLIGHT RELAY CIRCUIT 
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Taillight system does not light up.
  1. Taillight circuit
  2. Light control switch circuit
  3. Combination switch
  4. Luggage room J/B ECU
  5. Driver side J/B ECU
  1. TAILLIGHT CIRCUIT
  2. LIGHT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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