I just used an actuator on my driver door. No relays. Actuators only cost 10 bucks on ebay. Just two wires. My passenger door is vacuum controlled. dont remember how that works. unlocking/locking passenger door locks driver door but locking/unlocking driver door does nothing to passenger door. I guess I didnt do it right.
If you want to put actuators on more than one door, it might be a bit harder.
I also put a couple relays in so windows go up when you lock door.
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