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The ring with tthe drops on is more of a "sensitivity" adjustment.
If you leave it on 1 drop for example - the wipers may not work quite so well in very light drizzle.
Turn it to 4 drops and they may start to work in next to no rain at all.
Try to experiment - leave the control on position 4 - if the wipers come on too much ,turn it to 3 and see if it makes a difference.
To be honest I can't really see the point of this function as the auto function seems to work pretty well anyway.
I am sure that as it has the same stalk as cars fitted without auto wipers they wanted it to do something.
As said - on cars without auto wipers, it does indeed alter the time interval between sweeps when on intermittant.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.