[RIP]

You can buy a Haynes or Chilton's manual for a basic guide. Some libraries have them. My drivers side sliding door wouldn't lock electrically a while back. Would lock manually. Turned out the metal prong the actuator hooked to was broken off. I just welded a screw in it's place.

You'll just have to get inside the door and figure out how the mechanism is supposed to work and why it's not. The door trim panel is held on with plastic "tree" fasteners that just pop out. I slipped putty knives on either side of a fastener and pryed intil it popped loose. Popped a few loose then got my fingers under the panel and pulled the rest loose. There may be a screw in the middle under a plug. Don't recall for sure.