2015 year. Unit works perfectly in all areas (XM,Bluetooth,camera, etc.) except AM/FM which has nothing but static. Already replaced antenna on the rear. Pulled the radio to make sure the cable was still plugged in which it was. Started to pull the rear headliner but could not get it down far enough to see. Found several videos but that all talked about taking off parts that did not exist. ?1, is the antenna cable one piece or could there be another disconnect between the antenna mount and radio and where would it be located? ?2 any links to a video specific for this year/model for access to the antenna base?