Lexus IS250 · Service Manual BODY ELECTRICAL

PROBLEM SYMPTOMS TABLE

Troubleshooting

HORN SYSTEM 
Symptom
Suspected area
See page
Horn does not sound
1. HORN fuse
-
2. Horn relay
Click here
3. Steering pad switch
Click here
4. Spiral cable
Click here
5. Windshield wiper switch assembly
Click here
6. Power source control ECU
-
7. Multiplex communication line
Click here
8. Wire harness
-
Horn blow all the time
1. Horn relay
Click here
2. Steering pad switch
Click here
3. Wire harness
-
Low pitched horn operates but high pitched horn does not operate
1. High pitched horn
Click here
2. Wire harness
-
high pitched horn operates but low pitched horn does not operate
1. Low pitched horn
Click here
2. Wire harness
-
← SYSTEM DIAGRAMINSPECTION →