Can someone explain how to override the intermittent wiper auto mode? I see that there are 4 modes for the windshield wipers: OFF, AUTO, LO, & HI. However, there is an adjustment ring for the AUTO mode which has 4 different speeds (slow to fast). These seem to have no effect since AUTO chooses its own speed. Although the AUTO mode works fairly well there are times (such as light snow) where I need to increase the intermittent speed (but not go to LO speed). Am I missing something?