Locate the harness plugged directly into the back of the door lock switch.
Power door lock wiring.
Next with your multi meter probe each of the wires in this harness and write down the.
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Power door locks have been around for many year but manufacturers use different wiring schemes.
If there are no external door lock.
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.
To determine what type of door lock switch you are working with follow these three steps.