LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2003 >> IS 300 Base, Automatic >> Repair and Diagnosis >> Body & Frame >> Windows >> Troubleshooting (Body Electrical) >> Problem Symptoms Table >> Fog Light System
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fog Light System

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

PROBLEM SYMPTOMS - FOG LIGHT SYSTEM

Symptom Suspect Area Go To
Front fog light does not light up with light control SW TAIL or HEAD (LO-beam only). (Headlight is normal.)
  1. Bulbs
  2. FR FOG Fuse
  3. Front Fog Light Relay
  4. Front Fog Light Switch
  5. Wire Harness
  1. -
  2. LOCATION
  3. INSPECTION
  4. INSPECTION
  5. -
Only one light does not light.
  1. Bulbs
  2. Wire Harness
  1. -
  2. -
Rear fog light does not light with light control SW HEAD. (Headlight is normal.)
  1. Bulbs
  2. ECU-B2 Fuse
  3. Rear Fog Light Switch
  4. Wire Harness
  1. -
  2. LOCATION
  3. INSPECTION
  4. -
Rear fog light does not light with light control SW HEAD. (Headlight does not light.)
  1. Inspect Headlight and Taillight System
  2. Wire Harness
  1. PROBLEM SYMPTOMS TABLE 
  2. -
Only one light does not light.
  1. Bulbs
  2. Wire Harness
  1. -
  2. -
scientia non olet · About LEMON Manuals