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 ProcedureAccessory Socket Inspection
Front
1. Disconnect the negative battery cable..
2. Remove the upper panel..
3. Remove the shift lever knob. (MTX).
4. Remove the selector lever knob. (ATX).
5. Remove the shift panel.
6. Remove the accessory socket (front).
7. Connect a tester as shown in the figure and verify that the ...
Radar Sensor (Front)
Your vehicle is equipped with a radar sensor (front).
The following systems also use the radar sensor (front).
Mazda Radar Cruise Control (MRCC)
Forward Obstruction Warning (FOW)
The radar sensor (front) functions by detecting the radio waves reflected off
a vehicle ahead
or an obstru ...
Hazard Warning Switch Inspection
1. Disconnect the negative battery cable..
2. Remove the center panel..
3. Verify that the continuity between the hazard switch terminals is as indicated
in the table.
If not as indicated in the table, replace the hazard warning switch.
4. Apply battery voltage to hazar ...