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The drive mechanism for the power lock is jambed. I had the same problem, with exactly the same symptoms, on the driver-side rear door on my '97. The power lock module (motor) inside the door must be replaced. I disassembled my door and removed the lock module, to see what exactly was wrong - and see what could be done. The drive gears/ mechanism are made of nylon...and some parts simply failed (broke up). The module is not designed to be repaired....but, as a temporary fix, I pried it open and removed the offending bits that were jambing the manual lock mechanism. So then, the door lock could be used manually. You can probably get the door open by holding the inside lock switch back, then using the inside door latch. Be careful of doing this too many times, though....as many of the parts are plastic and subject to breakage, if over-stressed like this too often.
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