Since you are already down to the actuators, check for voltage on both wires when you press the lock switch. When you push it to "lock", you should have 12 volts on just on of the wires at the actuator. If you have 12 volts on both wires, you will also have it on both in the "unlock" position. That indicates the ground is missing. The best suspect for that is a broken wire between the door hinges.
That can also be caused by a bad switch, but most of the time the locks will still work from the other switch. The better clue is a bad switch will usually work for "lock" OR "unlock", but not both. The clinker is either switch can cause only the other one to not work, but again, it's not common for both the "lock" and "unlock" functions to fail at the same time.
Sunday, March 5th, 2017 AT 5:26 PM