Tweeter Inspection

Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
Remove the side speaker grille. (See SPEAKER GRILLE REMOVAL/INSTALLATION .)
Remove the tweeter. (See TWEETER REMOVAL/INSTALLATION .)
Inspect the resistance between tweeter terminals A and B.
Tweeter resistance

3.4-4.6 ohms
- If not within the specification, replace the tweeter. (See TWEETER REMOVAL/INSTALLATION .)
  
  Fig 1: Checking Resistance Between Tweeter Terminals A And B
  Courtesy of MAZDA MOTORS CORP.