Bass-Box Inspection

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Disconnect the connector. (See BASS-BOX REMOVAL/INSTALLATION .)
Verify the resistance between bass-box terminals.

Fig 1: Checking Resistance Between Bass-Box Terminals
Courtesy of MAZDA MOTORS CORP.
- If not within the specification, replace the bass-box.
  
  Fig 2: Bass-Box Terminals Chart
  Courtesy of MAZDA MOTORS CORP.
  
  Resistance
  
  0.9-1.1 ohms