Hello, Just installed an AVIC-8400NEX.  Everything seems to function, but I don't understand what I can display on my rear seat screen.  I have my head unit connected via iData maestro to retain OEM functionality, including the rear seat entertainment screen. I can get DVDs in the HU to play on rear screen (so wiring is correct).  And, I get that HDMI won't work due to security unless I use an HDMI-RCA cable (bummer).  My question is about the Mirroring function.  I have set AV/Rear to mirror but the screen remains blank no matter what's on the HU.  I thought this would mirror, say, HD radio or pandora info for example, but it doesn't.  Is there a setting I have wrong?  Or is AV/Rear/Mirror pulling from android miracast?  Confused why I can't get anything to mirror on the rear.  Any ideas?  thanks.

 

Tim