Have you adjusted the sensitivity to see how that affects the things? Best way for us to help you is to see a video.
I bet it has some sort of frequency of water droplets it adjusts for.The rain sensor is something that is not easy to explain. It uses a number of variables to determine when to wipe and when to rest.
Basically - if driving is steady rain, they will wipe constantly (provided you are driving are a constant speed). The faster the speed, the more the sensitivity is adjusted. Should you stop at an intersection, the rate of wipe will decrease or stop as a result of the wheels not turning and you not needing as much forward visibility.
One way that I learned about the reaction of the wipers was driving next to semi who splashed a large puddle onto my car. The wipers went to super fast wipe mode for 3 or 4 cycles, then returned to a slower, more regular pattern.
Hopefully this adds a little extra clarification. Rogers was more detailed.
The rain sensor is a part of the mirror mount which is flat against the glass. There is no toggle switch for the rain sensing other than the stalk. Intermittent cycling is completely separate from rain sensing.cableguy: I have a similar or the same problem in my 2016 Prestige. But I haven't documented it as well as you. I just know that sometimes there are long visibility-reducing delays in the intermittent wiper movement, regardless of how I've set it. Frustrating.
Would turning off the switch on the rear-view mirror (for auto dimming) also turn off rain sensing? This just occurred to me so I haven't tried that yet (I currently have auto-dimming on) and Roger mentioned the rain sensor is on the Prestige mirror mount.
Or, am I correct in understanding there is no toggle somewhere to turn off rain sensing?
Would appreciate any updates on progress with this problem.
Also, do you have another problem I have--your wipers jumping up slightly from bottom of windshield when turn engine off (or on?)?