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its a known problem with the 02 and 03. the problem is actually with the drivers side switch. the wires work themselves loose somehow even though they're still connected. they act like theres a short in the wire, but theres not. some people have had luck with replacing it with an 04+ switch, others havent. dont think there is a definite fix for it, but you're not alone in having the issue....and its not a fuse or relay or anything like that.
Switchdoctor.com has master switches cheap, bought my master 6 mo ago and no problems, even when I leave the window down in a rainstorm