Doubtful that it is, but it's a process of elimination. The switch or the amp are usually the culprit 99% of the time, but to verify for certain you can swap the motor out as a last ditch effort if the other parts don't fix it. After that, it's a harness problem. For S13s you'll be working in the underhood harness, for S14s it's all located in the dash harness. I have replaced one motor in my time of dealing with these cars, so anything is possible.
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