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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 REFERENCE

Symptom Suspect Area See Section
(1) Problem symptom table on front control system does not operate. (All)
  1. Power source circuit
  2. Ignition switch power source circuit
  3. Front light ECU
  1. POWER SOURCE CIRCUIT 
  2. IGNITION SWITCH POWER SOURCE CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Horn does not sound.
  1. Horn circuit
  2. Front light ECU
  1. HORN CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
(1) Front light control systems: Headlights, clearance lights, front fog lights, horn, washer system and washer fluid level warning.
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