Rear Door Speaker Inspection

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the power window subswitch. (See POWER WINDOW SUBSWITCH REMOVAL/INSTALLATION .)
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®: approx. 3.7 ohms

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