Interesting that you want to fit the rain sensor.
I've had this in previous Volvos yet my current car doesn't have it and I absolutely don't miss it!
The fact that when in "rain sensing wipers" mode, the scroll wheel allows you to adjust the sensitivity of the rain sensor kind of defeats the point in having the sensor in the first place!
I would always be adjusting the scroll wheel on the sensor because I could never get it it quite right, at which point you may as well just use the normal intermittent wipers and use the same stalk to adjust the frequency of the swipe.
I did have a rain sensor in a Peugeot 406 years back and that (surprising) worked REALLY well, because A) there was no sensor adjustment and B) There was no manual intermittent setting. It was either Wipers OFF or Rain Sensing Wipers ON, or Wipers on full.
Volvos system seems like overkill to me.
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