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/InstallationTiming Chain Removal/Installation [Skyactiv G 2.0]
WARNING:
A hot engine can cause severe burns. Turn off the engine and wait until it
is cool before servicing.
CAUTION:
If the camshaft is rotated with the timing chain removed and the piston at
the top dead center position, the valve may contact the piston and the engine ...
Brake Fluid Level Sensor Inspection
1. Disconnect the brake fluid level sensor connector from the master cylinder.
2. Inspect for continuity according to fluid level between the brake fluid level
sensor terminals.
If not as indicated in the table, replace the reserve tank.
...
Glass Panel Adjustment
1. Fully close the glass panel.
2. Measure the gap and height between the glass panel and body.
If not as specified, loosen the glass panel installation screws and reposition
the glass panel.
Clearance (4SD)
a: -2.4—0.2 mm {-0.09—0.01 in}
b: 0 mm {0 in}
...