Issue with AV cable for Toyota Entune

I bought an AV cable adapter with wire harness from BeatSonic and wired it up to a backup camera. The problem is that I still don't see an AV option on my Entune device after everything is wired up. My Entune unit lacks the ability to play DVDs but it can do various video formats according to the guide. I'm not sure if my Toyota Entune device is incapable of displaying video from an AV harness but I wanted to see if anyone else is having trouble. It could be a bad wiring job for all I know but I'm tempted to use something like this to experiment:

Is it possible my Entune device doesn't support AV connections all together? I don't see a greyed out AV option when my vehicle is powered on and Entune is at the connections setting. I have a 2014 Toyota Prius C Four if that helps any.