Rear Door Speaker Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the rear door trim. (See REAR DOOR TRIM REMOVAL/INSTALLATION .)
Disconnect the rear door speaker connector. (See REAR DOOR SPEAKER REMOVAL/INSTALLATION .)
Inspect the resistance between rear door speaker terminals B and C.
Rear door speaker resistance

Without Bose®: 3.4-4.6 ohms

With Bose®: 3.7 ohms

Fig 1: Checking Rear Door Speaker Resistance
Courtesy of MAZDA MOTORS CORP.
- If not within the specification, replace the rear door speaker. (See REAR DOOR SPEAKER REMOVAL/INSTALLATION .)