| 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 wheeland check that there are no impediments to the travel.If there are problems, replace the faulty component. |
| 1 | CHECK ON INTERVENTION OF FUSE | All OK | Problems encountered | Operation |
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| Check that the 15A horn protective fuse F10 in the engine compartment junction unit has not blown. | Move on to Step 2 | The fuse has blown. | Replace the fuse and search for the cause of the problem. |
| 2 | RELAY CHECK | All OK | Problems encountered | Operation |
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| Check that the horn relay feed T03 (20 A) 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 junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. and check, using a tester, that the power supply for the horn relay feed is correct. | 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 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 |