Remote door lock want lock all doors

no you needs a new lock actuator on that door its about $90 installed,
all the locks are on same circuit . sorry about the bad news :(

it is not the actuators, try a different remote, you may have an issue with the car security system/body computer not functioning on the unlock driver door command, one press of remote is unlock driver door and 2 presses is unlock the other doors.

this is a problem that can appear after your car battery died, cause the car didn't reset propely, so taking the battery out and putting it back in or letting your car die again would do the trick. I tried a lot of reprogramming procedured for my remote key, none of them worked, what did the trick though was simply unlocking the doors via the all door unlock button on the passenger side door, so simple.

I vote for corroded or loose cable inside door.

Does the Driver side door lock and unlock from the lock switch inside? If not then you have a bad motor or bad connection to the lock/unlock motor inside the door.

the solenoid may be weak, or it can be lubed. you will need to remove the door panel and see how it works, and try to lube it, or see if there is any binding.

Press the passenger side door lock button. if the driver side door unlocks now but wont unlock when you hit the driver side door lock button, it is usually a network communication problem with the B CAN or a faulty Body Control Module.

the remote takes 2 pushes of the unlock button to unlock all doors.

I do have a book on the 1996 but no on me but I have had a problem with it the same, Get in and sit in the drivers set and push lock from the in side and then do the same but this time unlock it and then get out and try to use the remote. if no then try to do the same thing but in the passenger side. lock and then unlock. no then call the ford dealer shop and they have a alarm department that will help you and I know because I had then do a job on one of my other cars and I was charged $20.00 he did it on a side job. Nikki2913

If remote locks and unlocks driver door but does not unlock passenger doors,then follow the advice above:
Get in the car using the key to unlock the doors. From the passenger side lock and unlock your doors using the button on the passenger door. Get out and the remote should now unlock all the doors with 2 presses.
Worked perfectly for me after several other suggestions (and dealer) failed.