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Does the drivers door lock and unlock from the drivers or passenger door lock switches?
The problem is the drivers unlock relay which is an internal part in the dash fuse box called the Smart Junction Box or SJB. It is a module which controls the door locks and several other functions in the vehicle. The relay can only be replaced with the dash fuse box. It cannot be serviced by itself. The dahs fuse box, or SJB will have to be programed to the vehicle once replaced to work properly in the vehicle. See the wiring diagrams below.