Your iphone will play via Bluetooth, aka no wires, provided it is paired with the Genesis and on the Bluetooth setting on the genesis.
The DVD should play on its own if I remember correctly. I can't remember what setting on the tv though, seems like av 1. I had to do some playing around with the wire behind my tv as it was not plugged all the way in but the sound work on the speakers.
You may need to get behind the unit to ensure the wires are set up correctly.
2008 Toyota Tundra Crewmax Limited w/tow mirrors, 5.7L, 4.30 gears, six speed tranny, towing package, Firestone Ride Rite airbags.
2014 Rockwood Roo 233s, PI HW30-C, Equalizer 10k 4 way hitch,