If the horn does not sound, replace the horn.
1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)
2. Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION.)
3. Remove the horn. (See HORN INSPECTION.)
4. Apply battery positive voltage to horn terminal, and connect the horn retaining bolt to ground as shown in the figure, and then verify that the horn sounds.
If the horn does not sound, replace the horn.