When I first found this post I was discoraged. Nothing but bad, wrong, and biased info.
But I persisted and weeded out the bad and found the good. A big thanks to vision2 for his pin outs.
I am now the proud owner of a factory dvd player installed in my '03 expedition, works perfectly, can be controlled from the stereo in front or from the rear seat controls.
I bought my expediton just two months ago ( so it is a newer model, I heard Ford made a change some months ago) it has the six-disk changer in the dash (not-audiophile) rear-air and rear seat audio controls.
USE THIS INFO AT YOUR OWN RISK! I AM NOT AN EXPERT BUT I CAN INSTALL MOST ANYTHING. I DO NOT GUARANTY THAT THIS WILL WORK FOR YOU. THIS IS JUST MY SUCCESS STORY!
This is how I did it, I bought a bracket from Ford #2L1Z78519K22AA for $35.00. I lowered the headliner, remove A-pillar grab handels, and trim pieces. Remove B-pillar trim and seat belts. Remove C-pillar trim and seat belts, remove coat hooks in headliner, (insert flat screw driver in notch behind flap, turn, wiggle and pull), remove passenger and drivers sun visors, pull down on overhead console, unplug wires for visors (plugs under tape above headliner). Keep front seats in a medium reclined position and lower headliner down to the seats. Install Ford's mounting bracket (rear part of bracket clips into notches and front part install under overhead console bracket) install nuts and bolts through new bracket. I then put chalk on the area where the DVD clips into and pushed the headliner upagainst the bracket (to transfer where to cut) and used a new utility knife to cut through the headliner (easy to cut). I then installed the wire harness (custom made by me, the dealer said that the wires were unavailible) from the new cut-out down to the drivers side C-pillar. Put everything back, in the reverse order.
With info I got here and from other sources I found two connectors behind the trim piece on the drivers side C-pillar. One connector was green (I think it is for the third seat power) and the other was grey (this is the one I used) I SINNED and CUT wires from the grey connector and cut the free end off of the DVD unit. I didn't cut all of the wires from the grey connector only the ones I needed. I then made my own "harness" and connected the DVD to the Expedition.
Pin #1 on the DVD goes to #2 on the truck (RED / yel wire) +12vdc
Pin #2 on the DVD goes to #9 on the truck (lt grn/blk wire) asys on or remote turn on
Pin #3 on the DVD goes to ??? on the truck (this pin is for the front panel lights, dimmer, I didn't connect)
Pin #4 on the DVD goes to #1 on the truck (blk wire) this is Left/Right audio shield
Pin #5 on the DVD goes to #6 on the truck (white wire) this is Left +
Pin #6 on the DVD goes to #3 on the truck (red wire) this is Right +
Pin #7 on the DVD goes to #10 on the truck (lt blu/pnk wire) this is A bus data wire
Pin #8 on the DVD goes to #11 on the truck (tan wire) this is B bus data wire
Pin #9 on the DVD goes to ??? on the truck (this is dimmer return I didn't connect)
Pin #10 on the DVD goes to #7 on the truck (blk/grn) this is -12vdc
Pin #11 on the DVD goes to #5 on the truck (lt grn) this is Left -
Pin #12 on the DVD goes to #4 on the truck (blk) this is Right -
I used speaker wire for the Left and Right audio, I used speaker wire (put in drill and twisted up) for the Abus and Bbus data wire and Red and Black wire for the power connections.
The connector on the truck is a 16 pin connector and the last 5 wires (org, blk shield, pnk, wht, red) I didn't use (they look like more audio wires maybe subwoofer??)
So now for under $200.00 total I have a factory DVD unit that works like it was ment to, I almost went the FM modulator route.
GOOD LUCK TO ALL!! HOPEFULLY YOU WILL HAVE THE SAME SUCCESS!!!!!