Every now and then when I start the car the rear wiper motor turns on and makes a grinding racket. The buttons on the dash are not turned on and the wiper is not turning. Sometimes I can get it to turn off by turning the blade but this time I could not get it to quit. Luckily I only had a short drive back to the office. Is there some way to shut that thing off so it doesn't make so much noise and probably burn the motor out?

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"Gerwalt" 1984 - 300TD