After the sound system amp was changed I had the same problem with the drivers side door lock
After looking at fuses and wiring, I changed the actuator still no change. Finally gave up and took to dealer. They reloaded or "flashed" the BCM and it's been working fine for the last 2 years. I put the old actuator back in and returned the new one.
Hope this helps.
I'll check that out. I really didn't want to get into the door and have to do "all that stuff"