1. Disconnect the negative battery cable..
2. Disconnect the connector..
3. Verify the resistance between bass-box terminals.

If not within the specification, replace the bass-box.

0.9—1.1 ohms
Auxiliary Jack/Usb Port Removal/Installation
Bass Box Removal/InstallationIdentification Number Locations
Vehicle Identification Number (VIN)
Engine Type/Number
MZR 2.0, MZR 2.5
MZR 2.3 DISI Turbo
SKYACTIV-G 2.0
...
Customer Assistance (Canada)
Satisfaction Review Process
Your complete and permanent satisfaction is of primary concern to Mazda. All
Authorized
Mazda Dealers have both the knowledge and tools to keep your Mazda in top
condition.
In our experience, any questions, problems, or complaints regarding the
operation of you ...
Engine Oil Level Inspection [Mzr 2.0, Mzr 2.5]
1. Position the vehicle on level ground.
2. Warm up the engine.
3. Stop the engine and allow at least 5 min before continuing.
4. Remove the dipstick, wipe it cleanly, and reinstall it fully.
5. Remove the dipstick and verify that the oil level is between the F and L marks
on the dipstick. ...