They may have checked the wiring, but the only thing these systems share is the location of the switches, the 'clockspring' and connector inside the steering column. Either they didn't connect everything properly, or the wiring is causing the problem. The only other thing is if the switches use the same wiring and multiplex (use different resistances) on the same circuit. Have them 'scope the switch connector while working the wipers. See if there are any voltage spikes....
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2004 Dark Plum Base with windows tinted, cabin filter, silencers removed, fog lights, 18\'s, all Red taillights, Blaine\'s struts, modesty cover, color-matched center dash, 06 rear bumper
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