1. Disconnect the negative battery cable..
2. Remove the front bumper..
3. Remove the horn..
4. Apply battery positive voltage to horn terminal A, 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.
Horn
Horn Removal/InstallationRear Combination Light Removal/Installation
NOTE:
Fogging or condensation on the inside of the rear combination lights may
occur due to a natural phenomenon occurring as a result of a temperature difference
between the interior and exterior of the combination lights. However, it has
no effect on the light performance because ...
Cooling Fan Relay [Skyactiv G 2.0]
Purpose, Function
The cooling fan relay operates by receiving the signal from the PCM to supply
power to the cooling fan motor.
Construction
The cooling fan relay is installed on the relay and fuse block.
Operation
The contact point is on when the battery vo ...
Battery Inspection [Skyactiv G 2.0]
WARNING:
Since battery acid is toxic, be careful when handling the battery.
Since battery acid is highly corrosive, be careful not to allow it to contact
clothing or the vehicle.
In case battery acid contacts skin, eyes, or clothing, flush it immediately
with running wa ...