The switch when moved in either direction applies both power and ground directly to motor legs without the use of any relays.
Aftermarket power door lock wiring diagram.
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Collection of aftermarket keyless entry wiring diagram.
Except at the switch in this case both motor legs rest at ground.
A wiring diagram is a streamlined conventional photographic representation of an electric circuit.
Next with your multi meter probe each of the wires in this harness and write down the readings during lock unlock and at rest positions of the switch.
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If there are no external door lock switches you will most likely have a vacuum type system or an aftermarket door lock system with relays or have an added actuator that needs relays.