My truck and Cruz do not have those options on our vehicles, we also don't have Auto wipers.I believe it houses lane departure and auto dimming cameras. May include other sensors as well. Seems i read about it in the manual.
I believe it is the light sensor for turning on/off the automatic headlights.
That could be the case, because when they took the windshield out the sensor was actually wired up. If that is the case, I could probably just add the wiper control with the auto wipers.It could be a "blank switch" type of thing, they might use the same housing for the trucks with a sensor there but your truck just has an empty spot where the rain sensor would be.