1 - Turning on the periodic glass cleaning mode
2 - Normal windshield wiper speed
3 - Increased windshield wiper speed
4 - Single wash
5 - Automatic washer mode
6 - Automatic intensive glass cleaning mode
Cleaning headlights and fog lights*
With the lights on, turn on the automatic washer mode or the automatic intensive cleaning mode.
Position 1 - periodic glass cleaning mode
The duration of the intervals depends on the speed of movement. Additionally, it is possible to program the cleaning interval*:
To program an interval for a short time, move the lever from position "1" to position "0".
The time until the next switch-on (transition from position "0" to position "1") will be the program value of the interval duration (the maximum possible period is 20 seconds; when the car is stationary, the interval doubles).
To turn off programming: move the lever to position "0" or turn off the engine.
Position 2 - normal windshield wiper speed
When the vehicle stops, it automatically switches to periodic operation mode.
Heated windshield washer nozzles*
Turns on automatically when the ignition key is in position "2".
Attention: The windshield washer can only be turned on if freezing of the liquid on the windshield is excluded, otherwise visibility will be impaired! The windshield washer cannot be turned on when the reservoir is empty, otherwise the windshield washer pump may fail.
Make sure that the wiper blades do not freeze to the glass, otherwise the electric motor may fail.
Read the original source on the website BMWman