mondeo dead locking fault?

locked my w reg mondeo it locked/unlocked a few times i used the key in the door and dead locked the car, this morning i tried to unlock it but it wouldnt, when i used the key it only unlocked the drivers door and no other i cant even unlock the doors from the inside, i changed the battery, no luck, i can unlock the passengers with a key but thats it.

micky
May 2011