1. Disconnect the negative battery cable..
2. Remove the front bumper..
3. Remove the horn..
4. Apply battery positive voltage and connect the ground as shown in the figure and verify the horn beeper sound operation.

If the beep sound cannot be verified, replace the horn.
Horn
Horn Removal/InstallationHeater, Ventilation And Air Conditioning
Abbreviation
A/C
Air Conditioning
Features
The full-auto air conditioner has been adopted for vehicles with SKYACTIV-G
2.0.
Specifications
Full-auto air conditioner
Basic system
Item
Specification
...
Mute
The microphone can be muted during a
call.
Press the talk button with a short press.
Say: [Beep] “Mute”
Prompt: “Microphone muted”
Canceling mute
Press the talk button with a short press.
Say: [Beep] “Mute off”
Prompt: “Microphone unmuted”
Transferring a Call f ...
Call interrupt
A call can be interrupted to receive an
incoming call from a third party.
Switch to a new incoming call using the
following methods.
Method 1
Press the pick-up button.
Prompt: “Swapping calls.”
Method 2
Press the talk button with a short press.
Say: [Beep] “Swap calls”
...