Operating principle

The windscreen wipers, the windscreen washer pump and the pump for the headlight cleaning system are controlled by the Junction Box Electronics (JBE) control unit.

The wash/wipe switch is connected to the steering column switch cluster (SZL). The switch statuses are sent via F-CAN to the DSC control unit and from the DSC control unit via PT-CAN to the JBE control unit.

In the automatic mode, the rain-driving light-sensor (RLS) registers the rain intensity. It sends the data on the LIN bus to the roof function center (FZD). The FZD then sends the rain intensity on the K-CAN to the JBE.

To prevent the washer jets of the car wash from freezing, there is a washer jet heating. The JBE controls this heater depending on the ambient temperature. The JBE receives the ambient temperature from the instrument panel across the K-CAN. The washer jet heating is activated together with the heater for the exterior mirrors.