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July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Problem Symptoms Table

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

HEADLIGHT AND TAILLIGHT SYSTEM: 

HEADLIGHT AND TAILLIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
"LO-beam" headlight does not light up.
  1. Light control switch circuit
  2. Headlight relay circuit
  3. Driver side J/B ECU
"Hl-beam" headlight does not light up.
  1. Headlight circuit
  2. Light control switch circuit
  3. Front light ECU
  4. Driver side J/B ECU
"Flash" headlight does not light up.
  1. Headlight circuit
  2. Light control switch circuit
  3. Front light ECU
  4. Driver side J/B ECU
Headlight is dark.
  1. Light control switch circuit
  2. Driver side J/B ECU
Headlight does not light up or has abnormal operation.
  1. Combination switch power source circuit
  2. Light control switch circuit
  3. Driver side J/B ECU
Taillight does not light up or has abnormal operation.
  1. Taillight circuit
  2. Combination switch power source circuit
  3. Light control switch circuit
  4. Luggage room J/B ECU
  5. Driver side J/B ECU
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
Both left and right headlight does not light up.
  1. Headlight circuit
  2. Light control switch circuit
  3. Front light ECU
  4. Driver side J/B ECU
Headlight beam level control system does not operate.
  1. Headlight beam level control actuator circuit
  2. Height control sensor circuit
  3. Headlight beam level control ECU communication circuit
  4. Headlight beam level control ECU power source circuit
  5. Headlight beam level control ECU
  6. Passenger side J/B ECU
  7. Skid control ECU

STOP LIGHT SYSTEM: 

STOP LIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
Stop light system does not light up.
  1. Stop light switch circuit
  2. Stop light circuit
  3. Driver side J/B ECU
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

FOG LIGHT SYSTEM: 

FOG LIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
Fog light does not light up or has abnormal operation.
  1. Front fog light circuit
  2. Light control switch circuit
  3. Front light ECU
  4. Driver side J/B ECU

TURN SIGNAL LIGHT SYSTEM: 

TURN SIGNAL LIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
Hazard warning light does not light up.
  1. Hazard switch circuit
  2. Combination switch
  3. Front light ECU
  4. Driver side J/B ECU
Turn signal light does not light up.
  1. Turn signal light circuit
  2. Light control switch circuit
  3. Front light ECU
  4. Driver side J/B ECU

ILLUMINATION LIGHT SYSTEM: 

ILLUMINATION LIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
Each switch illumination light does not light up.
  1. Illumination light circuit
  2. Driver side J/B ECU
Buckle illumination light does not light up.
  1. Buckle illumination circuit
  2. Driver side J/B ECU or passenger side J/B ECU

INTERIOR LIGHT SYSTEM: 

INTERIOR LIGHT SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area
Door courtesy light does not light up.
  1. Door courtesy light and courtesy switch circuit
  2. Driver side J/B ECU or passenger side J/B ECU
Luggage compartment light does not light up.
  1. Luggage compartment light circuit
  2. Luggage compartment door courtesy switch circuit
  3. Luggage room J/B ECU
Interior light does not light up.
  1. Interior light circuit
  2. Driver side J/B ECU

OTHERS: 

OTHERS PROBLEM SYMPTOMS

Symptom Suspect Area
Back-up light does not light up.
  1. Back-up light circuit
  2. Driver side J/B ECU
  3. Luggage room J/B ECU
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
Clearance light does not light up.
  1. Clearance light circuit
  2. Light control switch circuit
  3. Combination switch
  4. Front light ECU
  5. Passenger side J/B ECU
Side marker light does not light up.
  1. Front side marker light circuit
  2. Rear side marker light circuit
  3. Combination switch
  4. Front light ECU
  5. Driver side J/B ECU
Light auto turn off system light does not operate. (Headlight is normal)
  1. Headlight circuit
  2. Light control switch circuit
  3. Driver side J/B ECU
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