Cowl side woofer

WARNING: This page is about a different car, the 2020 Mazda CX-30. 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 cowl side woofer. (See COWL SIDE WOOFER REMOVAL/INSTALLATION (US) .)
Inspect the resistance between cowl side woofer terminals A and B.
Cowl side woofer resistance

Without Bose®: 3.2-4.0 ohms

With Bose®: 1.1 ohms

Courtesy of MAZDA MOTORS CORP.
- If not within the specification, replace the cowl side woofer. (See COWL SIDE WOOFER REMOVAL/INSTALLATION (US) .)