Horn Removal/Installation

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the front bumper. (See FRONT BUMPER REMOVAL .) (See FRONT BUMPER INSTALLATION .)
Remove the ground bolt.

Fig 1: Ground Bolt With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Disconnect the connector.
Remove the bolt.
Remove the horn.
Install in the reverse order of removal.