Originally Posted by RBYCC

More trouble then it's worth.
The wipers are combined with a washer.
They only operate with headlights on and when the windshield washer is activated.
The windshield washer reservoir has a second pump that feeds the headlight wiper blade.
Much like the windshield wiper, it's really not designed to clear mud or heavy dirt, just to keep the optics clean of normal road/driving haze buildup.