Functional description, see BMW Technology:
TIS -> Documents> SI Technology -> 61 06 03 (026)
The window wipers, the windshield washing pump and the pump for the headlight-cleaning system are controlled by the body base module KBM. The wiper motor is actuated via an external dual relay module.
The wiper switch is connected to the steering column switch cluster (SZL). The switch states are transferred across the data buses byteflight and K-CAN to the KBM.
In the automatic mode, the rain/driving light sensor registers the rain intensity. The sensor sends its request for wiper activation across the K-CAN to the KBM.
To prevent the washer nozzles of the washer system from freezing, there is a nozzle heater. The nozzle heater is activated depending on the outside temperature (temperature < 3o C) by the IHKA.