Speaker Inspection: Bass-box

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Remove the bass-box. (See BASS-BOX REMOVAL/INSTALLATION (US) .)
Inspect the resistance between bass-box terminals A and B.

Bass-box resistance

1.24 ohms

Courtesy of MAZDA MOTORS CORP.

If not within the specification, replace the bass-box. (See BASS-BOX REMOVAL/INSTALLATION (US) .)