Theft-Deterrent Horn Inspection

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION .)
2. Rear scuff plate (RH) (See REAR SCUFF PLATE REMOVAL/INSTALLATION .)
3. Trunk side trim (RH) (See TRUNK SIDE TRIM REMOVAL/INSTALLATION .)
4. Theft-deterrent horn (See THEFT-DETERRENT HORN REMOVAL/INSTALLATION .)
Apply battery positive voltage to horn terminal A, and connect the horn retaining bolt to ground as shown in the figure, and then verify that the horn sounds.

Fig 1: Applying Battery Positive Voltage To Horn Terminal

Courtesy of MAZDA MOTORS CORP.

If the horn does not sound, replace the horn.