Check out the schematic at www.hmaservice.com. Go to "service information"
and "webtech" and enter your year and model and click on the "ETM" tab for
There's been a problem with water getting inside the wiring connectors
between the door harness and the in-vehicle harness and corroding the
terminals, causing a vairety of issues, but in my experience this is less
common than a problem with the door lock actuator itself.
I've seen a couple cars with doors that were replaced due to body damage,
and the used door that was installed had the wrong actuator in it.
Furthermore, if you're under 60k miles in the U.S., take it to the dealer
and let it be their problem-- you'll still be within the warranty period.