IV. Background

IV. BACKGROUND

Each wiper arm is installed onto a pivot shaft which is linked to the wiper motor mechanism by an installation nut (wiper arm nut). The wiper arm nut may not have been tightened sufficiently due to high friction between the nut and the wiper arm. Under certain usage conditions such as a buildup of heavy snow on the windshield one or both of the wipers could become inoperative. Inoperative wiper arms could reduce driver visibility and increase the risk of a crash.