It's the thing marked with this-> Ω
I will clarify a bit - it has that setting, and tells you where to plug the leads in, then tells you to short them and look for a reading on the display of 1.
Seems like I get almost the opposite results, but either way does not lead to a feeling of certainty.
The leads are also kind of short so checking the wire from the switch connector to the lock actuator connector is a challenge.
And, since there are 3 smaller wires that bundle with the larger actuator power wires - blue and brown, IIRC, I am not sure how to test them.
I tried listening for a relay tonight - kind of hard to hear and so far cannot be found by sight if there.
May be time for a better meter, and perhaps check continuity between the connector under the dash by the kick panel to the switch connector.
If there is continuity in the blue wire in that test then it would seem to imply that wire including in the door and jamb is good, and the problem is elsewhere.
Sound reasonable?