Lexus IS250 IS220d GSE20 ALE20 - HORN
HORN SYSTEM - PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | See page |
| Horn does not sound | 1. HORN fuse | - |
| 2. Horn relay | ||
| 3. Steering pad switch | ||
| 4. Spiral cable | ||
| 5. Windshield wiper switch assembly | ||
| 6. Power source control ECU | - | |
| 7. Multiplex communication line | ||
| 8. Wire harness | - | |
| Horn blow all the time | 1. Horn relay | |
| 2. Steering pad switch | ||
| 3. Wire harness | - | |
| Low pitched horn operates but high pitched horn does not operate | 1. High pitched horn | |
| 2. Wire harness | - | |
| high pitched horn operates but low pitched horn does not operate | 1. Low pitched horn | |
| 2. Wire harness | - |
LEXUS IS250, IS220d / GSE20 ALE20