1. Remove the front accessory socket..
2. Connect the tester probe to the position shown in the figure and verify that there is continuity.

If it cannot be verified, replace the front accessory socket..
Center Accessory Socket Removal/Installation
Front Accessory Socket Removal/InstallationOwner Maintenance Precautions
The owner or a qualified service technician should make these vehicle inspections
at the indicated intervals to ensure safe and dependable operation.
Bring any problem to the attention of an Authorized Mazda Dealer or qualified
service technician as soon as possible.
When Refueling
• Brake ...
ABS Wheel Speed Sensor And ABS Sensor Rotor
Purpose/Function
The ABS wheel-speed sensor and ABS sensor rotor detect the rotation condition
of each wheel and transmit this information to the DSC HU/CM.
The signal from the ABS wheel-speed sensor is the primary signal that the
DSC HU/CM uses when carrying out control.
...
Battery [Skyactiv G 2.0]
Purpose, Function
The battery stores electricity generated by the generator. In addition, it
supplies power to electronic devices if necessary.
Construction
The battery is installed in the engine compartment. (vehicle left)
Fail-safe
Function not equipped.
...