It has been raining so I played with them. Even read the owner's manual.
You move the stalk down to position 1 for intermittent. Then you rotate the dial to the desired position. OFF, INT, LO, and HI. But when I set the dial to off the wipers continue to operate. Is that they way it is supposed to work - there is really no off when using the dial? Otherwise the only way to shut them off is to move the stalk all the way up.