The windshield wiper may have been produced without grease applied to the output shaft gear. After a period of continuous use on the high speed setting, this lack of grease could cause the gear teeth to distort or fracture, resulting in the loss of wiper function. An inoperative wiper during inclement weather conditions could cause a crash due to impaired visibility. Dealers will inspect the wiper motor for the presence of grease. Grease will be applied to the wiper motor gears if necessary. The Mazda recall number is 3705K.