Most of the electrical components in the door are powered by a small bundle of wires that runs from the engine compartment into the drivers door. Quite often when there is a problem with a door-based electrical component, if the fuses are fine then the problem is in the wiring, and more then likely there is a fault located within the section of exposed wire between the door frame and the door. With a 19 year old car, these wires have been flexed hundreds of thousands of times, exposed to all kinds of weather and will eventually wear out. Start by looking at those wires and then tracing from there.
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