landinj, the good news is that I was able to play a DVD movie on the front TV this weekend. Our front TV is a Jenson. After powering it up, I used the Jenson remote to press "Source" and then scroll down to the "Component/AV" menu item. Then hit "Enter" to select that input. In my case, that is the Clarion unit in the dash.
Then I just inserted the DVD movie in the Clarion and it began playing. I could see it on both the Clarion screen and on the Jenson TV. Using the Clarion remote you can pause/play/eject and control the volume. The sound plays from the in-ceiling Greyhawk speakers as well as the in-door Ford speakers. Note: Unless you want to meet your neighbors, make sure the indoor/outdoor speaker selector switch by the door is set for the indoor speakers.
The bad news is that my Clarion now refuses to play a video DVD or a music CD.
I went out to the Greyhawk to write down the steps to play a movie on the bedroom TV, but when I try to load a DVD or CD it ejects it with the "Invalid disc" error on the screen. I'll open a new thread on this to see if anyone can provide a hint.