Remove the antenna jack from the audio unit and antenna.

Check for continuity between the center poles of antenna cable.

Check for continuity between the outer poles of antenna cable. There should be continuity.

If there is no continuity, replace the antenna cable.

Check for continuity between the center pole of antenna cable and terminal of glass antenna. There should be continuity.

If there is continuity, replace the antenna cable.

Remove the rear roof trim.

(Refer to the BD group - "Roof trim")

Disconnect the 1P power connector (A) and antenna jack (B) from the roof antenna.

Remove the roof antenna after removing a nut.

Installation is the reverse of removal.