Originally Posted by randman1
Is there +12v to both wires? What color are the wires you are testing?
Yes, when one wire is hot, the other is supposed to function as the ground; their roles reverse to operate the lock the other way. A double-relay controller operates it.
This may have nothing to do with it, but are you able to operate the car locks from either of the inside door rocker switches? How about from outside, using a key in the door? (Again, testing both door key locks, not just the driver'* side.) I'm wondering here whether there might be any other symptoms that could give us some more clues.