| 1 | CHECK POSITIONING OF HORNS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check manually that the horn bracket is securely fastened to the fixing point and that the fixing point does not show signs of damage/breaking.Check that both the horn casing and the bracket are not touching or are not in the immediate vicinity (less than 10 mm) of other objects (other components, cables, pipes, etc.) | Move on to Step 2 | 1. Bracket fastening faulty | 1. Renew the correct fastening of the bracket |
| 2. Fixing point damaged/broken | 2. Replace the fastening element |
| 3. Bracket damaged | 3. Replace the bracket |
| 4. Horn bracket or casing interfering with other components. | 4. Eliminate the cause of the interference |
| 2 | ELECTRICAL POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Connect a tester in parallel to the horn supply line and check that, whilst it is working, the supply voltage is more than 11.4 V | Move on to Step 3 | The voltage is below 11.4 V | Check the cause of the low power supply and restore the correct supply |
| 3 | HORN CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Remove the horn and connect it directly to a battery charger. Op. 5550B30 L/H OR R/H HORN (ONE) - R+R Check that a sound produced and that there are no unpleasant noises (knocking/buzzing) | Move on to Step 4 | Problems with the sound | Replace the horn Op. 5550B30 L/H OR R/H HORN (ONE) - R+R |
| 4 | ELECTRICAL CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| The problem is due to the presence of an irregular electrical absorption source in the electrical equipment.Search for and eliminate this cause | End of diagnosis | | |