If they will unlock but not lock, I don't think you have a fuse issue. May be a corroded or broken wire connection somewhere. I'll give you a link for the wire colors and one location you can test them at. It could also be a problem with the door lock relay module.
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If they will unlock but not lock, I don't think you have a fuse issue. May be a corroded or broken wire connection somewhere. I'll give you a link for the wire colors and one location you can test them at. It could also be a problem with the door lock relay module.