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Interior Light System

WARNING: This page is about a different car, the 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.

PROBLEM SYMPTOMS - INTERIOR LIGHT SYSTEM

Symptom Suspect Area Go To
All the lights do not come ON. DOME Fuse LOCATION
The driver door courtesy light does not come ON when the driver's door is opened.
  1. Driver's Door Courtesy Switch
  2. Wire Harness
  3. Body ECU
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
The passenger door courtesy light does not come ON when the passenger's door is opened.
  1. Passenger's Door Courtesy Switch
  2. Wire Harness
  3. Body ECU
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
The room light does not come on when the rear-right door is opened.
  1. Rear-Right Door Courtesy Switch
  2. Wire Harness
  3. Body ECU
  4. Room Light
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
  4. INSPECTION
The room light does not come on when the rear-left door is opened.
  1. Rear-Left Door Courtesy Switch
  2. Wire Harness
  3. Body ECU
  4. Room Light
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
  4. INSPECTION
Only one of the bulbs comes ON. Bulb -
The illumination does not fade out when all the doors are closed.
  1. Courtesy Switch
  2. Wire Harness
  3. Body ECU
  1. INSPECTION
  2. -
  3. BODY CONTROL SYSTEM
The illumination does not fade out immediately when the ignition switch is turned to ACC or ON within 15 seconds after all the doors are closed.
  1. Ignition Switch
  2. RADIO NO. 2 Fuse
  3. GAUGE Fuse
  4. Wire Harness
  5. Body ECU
  1. INSPECTION
  2. LOCATION
  3. LOCATION
  4. -
  5. BODY CONTROL SYSTEM
The illumination does not fade out immediately when all the doors are locked within 15 seconds after they are closed.
  1. Door Unlock Detection Switch
  2. Wire Harness
  3. Body ECU
  1. SYSTEM OPERATION CHECK
  2. -
  3. BODY CONTROL SYSTEM
Interior light does not light up. (in front personal light)
  1. Bulb
  2. Front Personal Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Front personal light does not light up.
  1. Bulb
  2. Front Personal Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Rear personal light does not light up.
  1. Bulb
  2. Rear Personal Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Vanity light does not light up.
  1. Bulb
  2. Vanity Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Luggage compartment light does not light up.
  1. Bulb
  2. Luggage Compartment Door Courtesy Switch
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Courtesy light does not light up.
  1. Bulb
  2. Door Courtesy Switch
  3. Wire Harness
  4. Body ECU
  1. -
  2. INSPECTION
  3. -
  4. BODY CONTROL SYSTEM
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