1. Disconnect the negative battery cable..
2. Remove the rear door trim..
3. Remove the rear door speaker..
4. Verify the resistance between the rear door speaker terminals.

If not within the specification, replace the rear door speaker.

Without Bose®: 3.4—4.6 ohms
With Bose®: 2.89—3.91 ohms
Rear Center Speaker Removal/Installation
Rear Door Speaker Removal/InstallationThermostat Removal/Installation [Mzr 2.0, Mzr 2.5]
WARNING:
Never remove the cooling system cap or loosen the radiator drain plug while
the engine is running, or when the engine and radiator are hot. Scalding engine
coolant and steam may shoot out and cause serious injury. It may also damage
the engine and cooling system.
Tu ...
After Service Precaution [Mzr 2.0, Mzr 2.5]
WARNING:
Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious
injuries or death and damage. When installing the fuel hose, perform “Fuel Leakage
Inspection” described below.
A person charged with static electricity could cause a fire or explosion,
...
Accessory Sockets
Only use genuine Mazdaaccessories or the
equivalent requiring no greater than 120 W
(DC 12 V, 10 A).
Type A
The accessory sockets can be used
regardless of whether the ignition is on or
off.
Type B *
The ignition must be switched to ACC or
ON.
With CD Player
Without CD Player
...