Just Bought A 2003 Expedition Eb ,having Problems With Rear Doors Not Locking With Remote Or Door Switch. I Have To Lock And Unlock By Hand . Thanks For Anyones Help. Also Does The Auto Trac Come On All E.b .s As Standard Equipment?

are the rear locks on the same fuse, or power line?

sounds to me like a power issue.
no power to the locks.
is the fuse blown?

Do You Know Where The Door Lock Relays Are Located

sounds like the actuators inside the doors themself....very costly if that is the problem.....labor mostly.......all door locks work on same power line....
hope this helps.....

I'm having the same problem with my 01 Expedition. I called the dealer and they want between $300-$500 to fix. I'm going to try and replace the actuators myself. Doing the research now

Check the wiring in the doors to make sure the actuators are being energized.
Make sure the electrical connections are clean and secure.
Make sure the linkage is clean and lubricated and can move easily.