Sedan (4SD)

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 following parts:
1. Rear scuff plate (See REAR SCUFF PLATE REMOVAL/INSTALLATION .)
2. Rear seat cushion (See REAR SEAT CUSHION REMOVAL/INSTALLATION .)
3. Rear seat back (See REAR SEAT BACK REMOVAL/INSTALLATION .)
4. Tire house trim (See TIRE HOUSE TRIM REMOVAL/INSTALLATION .)
5. C-pillar trim (See C-PILLAR TRIM REMOVAL/INSTALLATION .)
6. High-mount brake light (See HIGH-MOUNT BRAKE LIGHT REMOVAL/INSTALLATION .)
7. Rear package trim (See REAR PACKAGE TRIM REMOVAL/INSTALLATION .)
8. Rear speaker (See REAR SPEAKER REMOVAL/INSTALLATION .)
Inspect the resistance between rear speaker terminals A and B.
Rear speaker resistance

3.24-3.96 ohms

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