Wiper Stalk Switch Input

The wiping stage inputs are coded signals through a two wire link with a combination of high/low inputs.

Fig 1: Identifying Wiper Stalk Switch Input System Components

Courtesy of BMW OF NORTH AMERICA, INC.

The wiping stages include:

• Single (S)  - Momentarily holding the wiper switch down in the single position provides a momentary ground signal to activate a single sweep in slow speed.
• Slow (I) and Fast (II)  - The stage I and stage II wiping speeds are road speed dependent. Stage I switches to intermittent when the vehicle is stopped and stage II switches to stage I when stopped.
• Windshield Washing  - The wash request provides a switched ground input to the GM by pulling the stalk rearward. The GM activates the windshield washer pump directly.
• Intermittent (Int)  - The intermittent wiping time inputs are provided by a potentiometer mounted in the wiper stalk switch (1 through 4). The intermittent wiping intervals are also dependent on the road speed. As road speed increases, the wiping interval is shortened.