Note, an initialization should be done:
After the windscreen has been replaced.
If a used electronic part has been fitted.
If the rain sensor is activated even though the electronic part has been loosened from the optics unit.
If there is dysfunction of the rain sensor.
Test prerequisites:
The windscreen should be clean and not damaged in the area around the optics unit.
No faults in the system.
Test of functional after initialization:
Put the wiper stalk in position "interval" and drop water on the windscreen at the optics unit, the windscreen wipers should start when the optics unit have identifies moisture.
If the initialization failed:
Try to do a new initialization.
Troubleshoot the system.