Originally Posted by BillBoost37
The reason for asking about a drain is to determine if something is using power when it should not.
Right. My thinking is that the door lock actuators are always "working" as if someone always had their finger on the door switch. This could be one reason why the locks don't seem to work cause they're already doing something.
kicksock has a good idea of simply checking the fuse. In this case though, it'* a circuit breaker (#4). If my theory is correct, the circuit breaker will feel hot from current constantly flowing through. If you pull the CB, you might hear the lock actuators "relax". Plugging it back in, they should lock.
This is very easy to test without any tools (unless you consider beer to be a tool like I do). Give this a quick try to see if the locks behave as I described. If not, you should obtain a test light and a multimeter for further testing