I have 2020 ASpec with rain/speed sensitive wipers. They are very inconsistent in their operation. I always have them set to highest level but are inconsistent in their operation. I can have little rain and they are on fairly steady and then it can be raining quite hard and they are intermittent. Next service I’ll see if they can reset to be more sensitive?

 

is the windshield nice and clean where the sensor is ?

 

Did you read the manual????

 

Its not a manual thing...Its the rain sensing wipers. I had them on my 2016 TLX and they were horrible. Very inconsistent. They sometimes came on when it was sunny.
I had the dealer look at them and even showed them a video of the issues. They remounted the sensor but that did nothing.
I'm happy to not have them anymore.

 

I usually put them on the lowest / longest interval and let the sensors take care of the rest. Seems to work pretty well.

 

yes I read the manual and the window is clean. Will have to have sensor adjusted.