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Does the any of the locks lock from any of the door lock switches?
Sorry for the slow reponce.
Either the door lock relay or a bad wire could cause your problem. I would say the relay is the cause but with out a few test done I can't be postive.
There is a door lock relay which is located on the drivers side under the dash to the right of the steering wheel. Below is a diagram to give you an idea on its location.