not sure of the exact system, but as for simple electrical diagnosis, you could remove the door panels and unplug each solenoid/actuator and go through it that way with the process of elimination. hope this helps.
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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