I just this morning installed the HDMI to lightning adapter to enable display on my iPhone screen to the XRV10 display... seemed simple, removed the dash bezel, and slid the radio out, plugged in the HMDI adapter, and reassembled the dash on my 2019 Sforza 34T... powered up the radio selected HDMI and BAM! phone screen displayed! selected Google maps driving app to demo a navigation app and popped the parking brake... RED warning message told me I couldn't view any video while driving!!! ARGH.
So, thanks to this thread I know I need to disconnect and ground the pink wire.
I put the RV back in storage - I'll verify next weekend!
Joe