Horn LH

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the seal board upper. (See SEAL BOARD UPPER REMOVAL/INSTALLATION .)
Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION .)
Remove the horn LH. (See HORN REMOVAL/INSTALLATION .)
Apply battery positive voltage to horn LH terminal A, and connect the horn LH retaining bolt to ground as shown in the figure, and then verify that the horn LH sounds.

Fig 1: Applying Battery Positive Voltage To Horn LH Terminal
Courtesy of MAZDA MOTORS CORP.
- If the horn LO does not sound, replace the horn LO. (See HORN REMOVAL/INSTALLATION .)