You can even just use a test light if you want.
Usually motor. If your getting power, try to bump the motor when the handle of a hammer or something. The brushes are probably froze up.
I did notice the power door lock actuator needs to be replace there is a PIN that is broken off the top:nonono:
I ordered two locks from there and they are too damn wimpy to push the lock up or down. Just be weary for aftermarket locks. I still have the two of mine sitting on my bench and I just unlock or lock the car by hand now.