Bass-Box Inspection

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Inspecting Resistance Between Bass-Box Terminals

Courtesy of MAZDA

If not within the specification, replace the bass-box.

Fig 2: Bass-Box Terminals Continuity Chart
Courtesy of MAZDA

Resistance
0.9-1.1 ohms