Next with your multi meter probe each of the wires in this harness and write down the.
Power door lock wiring.
If there are no external door lock.
Power door locks have been around for many year but manufacturers use different wiring schemes.
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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.
This video will show you how to wire relays to control aftermarket door lock actuators.
On the above a second 3rd or 4th actuator could be wired in parallel to the first one.