usually when this happens to an S14 its the window switch, the plastic box that screws to the back of the door handle with 4 screws. The thing with the buttons on it. When mine does this I just smack it and it works again.
There is a well known issue with it getting stuck "down" and melting / creating a fire.
To avoid the issue, never put the window all the way down.
Although I thought this was a zenki only issue. I've not heard of it happening to 97+
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