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Home >> Lexus >> 2010 >> SC 430 >> Repair and Diagnosis >> Electrical >> Horns >> Horn (Inspection) >> Horn System >> Problem Symptoms Table >> Problem Symptoms Table

Problem Symptoms Table

HINT: 

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

HORN SYSTEM

Symptom Suspected Area See
Horn does not sound 1. HORN fuse Refer to PARTS LOCATION 
2. SECURITY fuse Refer to PARTS LOCATION 
3. HORN relay Refer to ON-VEHICLE INSPECTION
4. High pitched horn Refer to INSPECTION
5. Low pitched horn Refer to INSPECTION - Step 1
6. Front light ECU (Front controller) -
7. Driver side ECU -
8. Steering pad assembly (Combination switch) -
9. Wire harness -