Driver's door power lock quit working. Tried everything I could think of with no luck.

[DJPepper]

I've got a 2008 GMC Sierra 1500.  The lock was working until a few months ago when I left the window down a bit overnight and it rained. Water got right into the locking switch then the drivers side lock quit working (passenger still worked fine). I finally replace the switch this weekend and nothing's changed. I pulled the door apart and checked continuity between the switch plug and the actuator; it's connected. I also applied 12V to the actuator and it works fine. Fuses are all good. The rest of the switches there work fine. I'm not sure what else is in the lock circuit. Just wondered if anyone has any ideas before I try tracing wires.