939003717 - N023 HORNS WORKING ENDLESSLY

1RELAY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Remove the horn relay feed and check that the horns stop making a sound.Swap the horn relay feed T3 (it is the middle one in the top row) with the one for the main beam headlamps T (it is the first on the left in the top row) and check that the horns worn properly.Move on to Step 21. The horns continue to make a sound even without the relay1. Restore the correct electrical connections    See E3010 HORNS
2. The horns continue to sound without being pressed even after the relays have been swapped.2. Restore the relays to their places and move on to Step 3
2RELAY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the main beam headlamps are working properly.If the result is positive, remove the horn relay feed and check that the contacts do not show signs of oxidation or deformation.End of diagnosis1. The main beam headlamps remain on in all conditions1. Replace the main beam headlamp relay (which was originally the one for the horns)
2. There are irregularities at the engine compartment junction unit contacts.2. Renew the contacts. If necessary, replace the engine compartment junction unit    Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
3HORN ELECTRICAL CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Connect a tester to the horn supply line and check the continuity and the insulation of the line.Move on to Step 4Electrical faults: engine compartment junction unit defective.Replace the engine compartment junction unit    Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
4STEERING COLUMN SWITCH UNIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Remove the steering wheel and check that there is nothing preventing the operation of the horn control switch.Move on to Step 5Switch stuck in closed position.Replace the steering column switch unit.Op. 5550A12
5ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
The problem is due to the presence of a short circuit in the electrical system    See E3010 HORNS Search for and eliminate this cause.End of diagnosis