With Bose®

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .)
Remove the side speaker grille. (See SPEAKER GRILLE REMOVAL/INSTALLATION .
Verify that the resistance between the tweeter terminals is as indicated in the table.
- If not as indicated in the table, replace the tweeter.
  
  Fig 1: Checking Resistance Between Tweeter Terminals
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Tweeter Connector Terminals
  Courtesy of MAZDA MOTORS CORP.