Okay, I happen to have the same problems, but I got it fixed by coincidence ... when I was installing a headunit. basically, It should be one of the red fuses (15), right column, 3rd one done (or pull each of the red fuses, since I CAN'T REMEMBER WHICH ONE I pulled). When I pulled mine, it was blown, and when I replaced it, my intermmitent wiper started to work
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Hope your problem gets solved fast.
EDIT: If you see a white 240sx fastback with loud exhaust around pittsburgh downtown area, it's me