Horn Inspection

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the set plate. (See SET PLATE REMOVAL/INSTALLATION .)
Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION .)
Remove the horn. (See HORN REMOVAL/INSTALLATION .)
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.

Courtesy of MAZDA MOTORS CORP.
- If the horn does not sound, replace the horn.