Disconnect «negative» battery wire. Removing the radiator cover (see Removal of facing of a radiator).
head «at 13» unscrew the nut securing the horn plate to the body.
We remove the plate with a sound signal from the hairpin.
Disconnect the wires from the signal.
To adjust the signal, turn it over..
... and by turning the screw we adjust the sound.
Install the signal in reverse order.