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Wiper Relays

The wipers are controlled by two relays, located in the engine compartment fusebox. These are wired in such a way that one relay will run the wiper when energized, and stall it when de-energized (Front Wiper-Run/Park Relay).

The other will select either fast or slow speed on the wiper motor (Front Wiper-Fast/ Slow Relay).

Fig 1: Identifying Wiper Relays

Courtesy of BMW OF NORTH AMERICA, INC.