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 ProcedureError Indications (Type A)
If you see an error indication on the
display, find the cause in the chart. If you
cannot clear the error indication, take the
vehicle to an Authorized Mazda Dealer.
Indication
Cause
Solution
CHECK
USB
USB device
malfunction
Verify that the content
...
Starter Interlock Switch Removal/Installation [C66 M R]
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Disconnect the starter interlock switch connector.
4. Remove the starter interlock switch from the pedal bracket.
5. Insert a new starter interlock switch into the pedal bracket hole in the direction
indicated ...
Overloading
WARNING
Be careful not to overload your vehicle:
The gross axle weight rating (GAWR)
and the gross vehicle weight rating
(GVWR) of the vehicle are on the
Motor Vehicle Safety Standard Label
on the driver's door frame. Exceeding
these ratings can cause an accident
or ve ...