Did you ever figure out the issue here? I have an AVH-4200NEX. Went under some low hanging trees that hit the antenna and suddenly I had a similar issue on the HD radio. All my presets disappeared and there were no tuning options. Checked the connections on the back of the radio and they were fine. Also checked the wire going into the antenna as best I could tell with the passenger door open. Could be that the antenna is damaged somewhere else, but it strikes me as odd because I drove an older Jeep where the antenna was physically broken off and I could still get a couple of the strongest stat
