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 ProcedureWarranties for Your Mazda
New Vehicle Limited Warranty
Powertrain Limited Warranty
Safety Restraint System Limited Warranty
Anti-perforation Limited Warranty
Federal Emission Control Warranty/California Emission Control Warranty
Emission Defect Warranty
Emission Performance Warranty
Emission Control ...
Wheel Hub Component Removal/Installation
CAUTION:
Performing the following procedures without first removing the ABS wheel-speed
sensor may possibly cause an open circuit in the wiring harness if it is pulled
by mistake. Before performing the following procedures, disconnect the ABS wheel-speed
sensor connector (axle side) ...
Front Door Checker Removal/Installation
1. Fully close the front door glass.
2. Disconnect the negative battery cable..
3. Remove the inner garnish..
4. Remove the front door trim..
5. Remove the front door speaker..
6. Remove the bolt A.
7. Remove the bolts B.
8. Pull out the front door checker from the front speake ...