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 (A) and outer pole (B) of antenna cable. There should be no continuity.
If there is continuity, replace the antenna cable.
Use multimeter in ohms (resistance) mode to measure the continuity.
Remove the rear roof trim.
(Refer to Body - "Roof Trim Assembly")
Disconnect the roof antenna connectors (A) from the roof antenna.
Remove the roof antenna (A) after removing a nut (B).
Connect the roof antenna connectors.
Install the rear roof trim.
Make sure that the cables and connectors are plugged in properly.
Check the audio system.