Disconnect the negative (-) battery terminal.
Remove the roof trim assembly.
<a href="content.asp?vehicletype=Passenger&mfrcode=KM&area=KME&langcode=ENG&modelid=JD12&modelyr=2013&mmctype=bd&mmcid=4&group=SHOP&pdftype=&cat1=2013+%3E+G+1%2E6+MPI&ec=&firstnodedesc=Body+%28Interior+and+Exterior%29&sitinfolist=91%5E9157%5E91570040%5Enone%5E801%5E6%5EENG%5EKM%5EJD12%5E2013%5Ebd%5E4%5Enone%5Enone%5Enone%5ESHOP%5E%24" target="_blank">(Refer to Body - "Roof Trim Assembly")</a>
Remove the hands free mic (A) after disconnecting the connector and loosening 3 screws.
Be careful not to damage the roof trim when removing the hands free mic.
Check the continuity of Mic between terminals.