Because the antenna system is equipped with a capacitor, the continuity cannot be checked. Therefore proceed the following simple inspection.
Turn the AM radio on.
Tune to the frequency that there is no broadcast and you will hear a buzzing sound.
Turn a work light on and shake it around the antenna rod. (around 10—20 mm {0.40—0.78 in})
CAUTION:
Use a fluorescent light type for the inspection. Accurate diagnostic cannot be done with a different type of light.

If a whirring sound from the speaker synchronized to the work light movement is confirmed, the antenna system is normal.
Coil Antenna Removal/Installation
Entertainment Personalization Features Setting ProcedureCustomer Assistance (U.S.A.)
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Authorized Mazda Dealers have the knowledge and the tools to keep your Mazda
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How to use USB mode (Type B)
Type
Playable data
USB mode
MP3/WMA/AAC/OGG file
This unit does not support a USB 3.0 device. In addition, other devices may
not be
supported depending on the model or OS version.
USB devices formatted to FAT32 are supported (USB devices formatted to other
...
Customer Assistance (Mexico)
Your complete and permanent satisfaction is our business. We are here to
serve you. All
Authorized Mazda Dealers have the knowledge and the tools to keep your Mazda
vehicle in
top condition.
If you have any questions or recommendations for improvement regarding the
service of
your Mazda ...