Except at the switch in this case both motor legs rest at ground.
Aftermarket power door lock wiring diagram.
It reveals the elements of the circuit as simplified shapes as well as the power as well as signal connections between the devices.
This video will show you how to wire relays to control aftermarket door lock actuators.
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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.
A wiring diagram is a streamlined conventional photographic representation of an electric circuit.
Door locks 5 wire alternating 12 volts positive type c relay wiring diagram.