there is an intermediate wiper conrtoler . This is a small printed circuit inside the wiper motor unit. Threre are 2 small copper contact arms that run on a small disc sencor to raed ihe intrval at wich the wipers are working at. The contact tip is worn off and must be replaced circuit and all. Around 65.00 Can.
Dryness will cause the wipers to vibrate or jitter against the glass. If there is not enough moisture on the windshield (for example, a light sprinkle of rain) the wipers may move with a jerky motion. Also, the wipers could be very old, and the wiping rubber/vinyl could have lost some of its softness and flexibility. If you mean vibration when they are not active, the wind against the windshield could cause them to flutter if they are not properly seated. A clean windshield and new wiper blades will usually cure the vibration.
A couple things could have happened. First check the fuse for the wipers,in the fuse box. Should be on dash on driver side,near the door. Look towards the bottom. The relay might be bad,that box is under the hood. Wiper motor could be bad or the swing arm that moves the wipers could be broke. Do you here the wiper motor at all?
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