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 ProcedureAutomatic Transaxle Shift Mechanism Removal/Installation
Selector Lever Removal/Installation
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
1
Upper panel
(See UPPER PANEL REMOVAL/INSTALLATION.)
...
Keyless Antenna Removal/Installation
Interior, Front
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Upper panel.
b. Shift knob (MTX).
c. Selector lever knob (ATX).
d. Shift panel.
e. Side wall.
f. Center panel.
g. Audio unit.
h. Rear heat duct (1).
3. Disconnect the connector.
4. ...
On Board Diagnostic System PID/Data Monitor Inspection [FS5 A EL]
NOTE:
The PID data screen function is used for monitoring the calculated value
of input/output signals in the module. Therefore, if the monitored value of
the output parts is not within the specification, it is necessary to inspect
the monitored value of input parts corresponding to ...