there is a plastic gear inside the window motor that commonly strips out. If you have an old working motor you can swap these gears out otherwise you will have to buy new motors.
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early nissans have a window amplifier its located on the driver door, its what the switch plugs in to, it looks like a little box. very common problem is they burn out, you wont have any power to the...
Generally, if an electric window is plugged in and is not operating, but the other windows are all operating properly, the window in question will need to have either a regulator or a motor replaced...