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Problem Symptoms Table

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
(1)Luggage room J/B control system does not operate. (All)
  1. Power source circuit
  2. Ignition switch power source circuit
  3. Luggage room J/B ECU
  1. POWER SOURCE CIRCUIT 
  2. IGNITION SWITCH POWER SOURCE CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Rear A/C system does not operate.
  1. Rear A/C amplifier circuit
  2. A/C ECU
  3. Luggage room J/B ECU
  1. REAR A/C AMPLIFIER CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Fuel lid opener system does not operate.
  1. Fuel lid opener motor circuit
  2. Luggage room J/B ECU
  1. FUEL LID OPENER MOTOR CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Luggage compartment door opener or closer system does not operate.
  1. Luggage compartment door opener switch circuit
  2. Luggage compartment door courtesy switch circuit
  3. Luggage compartment door (LOPN, LCLS) switch circuit
  4. Luggage compartment door key lock and unlock switch circuit
  5. Door Lock switch (Luggage) circuit
  6. Luggage compartment door motor circuit
  7. Luggage room J/B ECU
  1. LUGGAGE OPENER SWITCH CIRCUIT
  2. LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT 
  3. LUGGAGE COMPARTMENT DOOR CLOSER SWITCH CIRCUIT 
  4. LUGGAGE COMPARTMENT DOOR KEY LOCK AND UNLOCK SWITCH CIRCUIT 
  5. DOOR LOCK SWITCH (LUGGAGE) CIRCUIT 
  6. LUGGAGE COMPARTMENT DOOR OPENER MOTOR CIRCUIT 
  7. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Fuel sender gauge does not operate.
  1. Fuel sender gauge circuit
  2. Luggage room J/B ECU
  1. FUEL SENDER MAIN AND SUB GAUGE CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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
  1. LUGGAGE ROOM LIGHT CIRCUIT 
  2. LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Rear seat belt buckle illumination light does not light up.
  1. Rear seat belt buckle illumination light circuit
  2. Luggage room J/B ECU
  1. REAR SEAT BELT BUCKLE ILLUMINATION CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
(1) Luggage room J/B ECU systems: Rear A/C system, Fuel lid opener system, Luggage compartment door opener system, Luggage compartment door closer system, Fuel sender gauge, Taillight, Stop light, Hi-mounted stop light, Back-up light, License plate light, Luggage compartment light and Rear seat belt buckle illumination light.
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