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 stations. Not sure if the Pioneer disables the tuner if it doesn't pick up anything? That was your question and mine and it was never really answered.
I came here to mention that this happened to me as well. I’m on my second avh 4200 nex radio with the same issues described here. The first one had exactly the same issue but was replaced under warranty. Now this one is out of warranty and I honestly have no idea on what to do
AVH-4200NEX no AM/FM display+ tuner not working
in NEX Series
Posted
I came here to mention that this happened to me as well. I’m on my second avh 4200 nex radio with the same issues described here. The first one had exactly the same issue but was replaced under warranty. Now this one is out of warranty and I honestly have no idea on what to do