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A door lock actuator is usually forward or reverse polarity depending on lock or unlock, so the diagram Injector has work work well. You don't need the diode. Tap into one wire of the actuator and the relay will click for one direction and do nothing for the other. If it clicks when you lock the car then you connected to the wrong side.
You'll also need to fake the ACC depending on the SDC or whatever power supply you are using, so you get power to the PC.
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XPort 1.26 -GPS port splitter, logger, and USB device resume fix
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