2003 Mazda Protege Very Suddenly Rear Passenger Door Makes Buzzing Grinding Loud

2003 MAZDA PROTEGE
11,500 MILES
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Very suddenly my rear passenger door makes a buzzing/grinding loud noise when I try to unlock or lock the door with either the front autolock button or the unlock button on my key ring. I cannot manually lock it either--it seems to be stuck. Ideas for a simple fix? I don't live someplace I'd want to leave my doors unlocked. I'd every prefer to get it locked and not be able to unlock it. All the other doors work.
Dec 8, 2012 at 6:10 PM
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KHLOW2008
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The door lock actuator is bad and it has to be replaced to rectify.
Dec 8, 2012 at 6:39 PM
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