There is a solinoid in your door that actuates the locking mechanism. If one of the wires is loose, or somehow disconnected it will not work. Since the others work, unless your car has a fuse for each door, the problem will not be a fuse. It could be that the solinoid in that door is burned and requires replacement. A test light on the solinoid contact when trying to lock it will demonstrate whether there is power TO the solinoid. If there IS power to the solinoid, the solinoid is bad, if there is NOT power to the solinoid, you must find the disconnect. Usually it is one or both of the wires connected TO the solinoid.
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