Door lock issue

[Izeloz]

I have a '91 80 and I've been doing work on my doors lately (window runs, rebuilding window motors, rebuilding door actuators) and something happened. It used to be that all I had to do to unlock all my doors was turn the key in the driver door lock twice in a row. Now it doesn't matter how many times I turn the key; it only unlocks the driver door. The lock button still works to lock or unlock all the doors, but that's it. How did I lose the "two turns to unlock all doors" functionality, and how can I restore it? Thanks for any help!

 

[Road Apple]

Sounds like you have something wrong with the drivers side keylock switch/lock control module located inside the driver's door.

You may have done this already, but check the door jamb wiring for corrosion and wear. Pull back the loom in the front door jam wires and see if the wires are in good shape or not.

 

[Izeloz]

I had a Switch Doctor master switch in there, but it doesn't lend itself well to the auto-up mod, so I found a mid 90's Corolla switch on eBay. I cleaned the switch well and did the auto-up mod and everything worked well. All the windows work well, all the door locks work great. I recently had the entire dash and wiring harness out and the wiring and plugs and grounds are all nice and clean. If the door lock module inside the door was malfunctioning, would the double-turn key function stop working while everything else stayed working? Thanks for the input. I just barely put a new vapor barrier and door card in the door, so I hate to open it back up unless I need to to fix it.

Edit: I put the Switch Doctor master switch back in, as well as an old Land Cruiser master switch and the problem persists, so it's not the master switch that has a problem.