Originally Posted by Kenny kustom
Try engaging the emergency brake.
I don't think they would use the dash head unit to feed video to the other tv's.
Is there another DVD source in the fr3?
Yes, they do use the head unit as the DVD source to the primary TV. The typical "recommended" install is to wire it so that the parking brake must be set to allow the video to play. However, the wire to the parking brake is merely a ground. That wire can just be grounded at any point. A warning will appear that the parking brake wiring is not correct, but just click that off and it will work. The purpose of this is to prevent the dash head unit from displaying video to the driver while the vehicle is in motion.
Also check for a video on youtube. There is a "sweet spot" on the lower left corner of the screen. By pressing on this spot for approx 10 seconds, it bypasses the parking brake setting necessity. This was integrated into the Pioneer head unit for demonstration purposes, i.e, a store display.
I have recently installed a Pioneer head unit in our Jeep Liberty toad. Though we never intend to play DVDs in the toad, I did wire the parking brake to a ground and found the sweet spot and a DVD will play without setting the parking brake.
The head unit is easy to pull and access. There should be white, red, and yellow RCA outputs. If you are getting sound, the red and white are connected. The yellow is for video. These should be "OUT" ports at the head unit and "IN" ports at the TV. Our unit also has a yellow "IN" away from the others and that is for a backup camera. If you don't have an manual, you can also go on line with your model number and get the owners/install manual. The wires on the head unit should be clearly labeled.