If you guys have not resolved the door lock problem, I am going to assume it is a wiring issue. I had the same issue on an older car of mine, and it was the wire from the relay to the actuator. The wire had gotten old and although it was getting a current when I pushed the button (and worked intermittently), it was not enough power to give it a full current. Just a thought.
If you're trying to reset your (foot) parking brake but can't pull out the cable that comes from the front of the car far enough to fit in the equalizer, you might need to a look inside the parking brake. There's a little spring that gets pushed in when the brake is depressed, allowing the reset to work. Mine had somehow got out of place. Just push it back in place with a screwdriver and you're good to go. Took me a while to figure this one out. This worked on a 2009 SXT with the foot brake.