I've got a 94 LS and I'm having trouble with the back passenger side door lock. I've got the whole door panel off right now trying to fix this and cannot solve this.
Basically, If you were to try and lock and unlock the door from the switches, it will work a few times, but then after 3 or 4 times that one door will just not unlock (or lock). It will move slightly, but just not move all the way?
Looking at it with the door panel off, all of the moving parts seems to be fine?

Does anyone know what could be causing this?

 

Try to inspect the door lock actuator connector to see if any corrrsion. Also, try to inspect the harness running from the door to the B pillar for any broken wire.
That's all i can think of.

 

Where would I locate the door lock actuator connector?

Or the harness running from the door to the B pillar?

Are there diagrams of these?