I went through this nightmare with an 86 Caddy. The locksmith gave up. A body shop tore the lock up and got the door open. Then you can remove the lock from the door and see the trickery.
Try removing the lock on the working door, then spend the night studying it. Real piece of work.
Ultimately, the part responsible was plastic, worn-out, and irreplaceable (too old).
There are secondary latches, auto and manual locking mechanisms, and they are probably different for each model. Just try flipping, rotating, pushing and pulling things until you get lucky.
I don't know if there are detailed manuals.
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Tuesday, February 28th, 2006 AT 8:06 PM