Locate the harness plugged directly into the back of the door lock switch.
Power door lock wiring.
Basically each wire on the actuator rests on ground and then when the one relay gets activated the ground gets lifted to the actuator and power gets applied to the actuator making it go one way.
If there are no external door lock.
One wiring scheme is resistive rest at ground which has been used in the past by various.
Next with your multi meter probe each of the wires in this harness and write down the.
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On the above a second 3rd or 4th actuator could be wired in parallel to the first one.