my guess is the wiper delay module. not the wiper motor. we list a wiper delay module on ebay every week. i have a box of them, and we sell one almost every week, they do fail, just like any other electrical module, i have personally changed 2 for customers at my shop and fixed one that wouldnt shut off, and another that worked intermidiately. im not saying your motor cant be bad, but its a hell of alot easier to try a module first, chaning the wiper motor sucks, and requires pulling the hood off too.