Horn LO

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

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