| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check, by operating the horn control on the steering wheel, that the travel is correct. | Move on to Step 1 | Travel not correct. | Remove the steering wheel Op. 4110A10 STEERING WHEEL - R+R FOR REPLACEMENT OR CHECKS and check that there are no impediments to the travel.If there are problems, replace the faulty component |
| 1 | FUSE INTERVENTION CHECK | All OK | Problems encountered | Operation |
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| Check that the horn protective fuse in the engine compartment control unit has not blown See E3010 HORNS | Move on to Step 2 | The fuse has blown. | Replace the fuse and find out what caused it to blow. |
| 2 | RELAY CHECK | All OK | Problems encountered | Operation |
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| Check that horn control relay T03 is working properly. | Move on to Step 3 | Relay defective | Replace the relay |
| 3 | RELAY ELECTRICAL CHECK | All OK | Problems encountered | Operation |
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| Undo the fastenings for the engine compartment control unitOp. 5505A13 and check, using a tester, that the power supply for the horn control relay is correct. See E3010 HORNS | Move on to Step 4 | Power supply interrupted | Restore the correct power supply |
| 4 | HORN CHECK | All OK | Problems encountered | Operation |
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| Remove the horn Op. 5550B30 L/H OR R/H HORN (ONE) - R+R and connect it directly to a battery charger. Check that a sound is produced and that there are no unpleasant noises (knocking/buzzing). | End of diagnosis | Sound faulty or no sound produced. | Replace the horn Op. 5550B30 L/H OR R/H HORN (ONE) - R+R |