Steering Column Switch Center (SZL)

The SZL evaluates the signal from the windshield wiper switch and calculates the wiper system function requested by the driver. The bus message is sent out on the byteflight.

Fig 1: Identifying Steering Column Switch Center (SZL) Schematic

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: If communication between the wiper switch and the wiper module is disturbed, the fail-safe result is continuous operation of the wipers.