Myself and another fchatter posted in the 599 forum about this issue but did not find an answer. Here is his original text: Hi all, got a 599 where the wiper stalk doesn't really operate correctly. When I push it upwards it doesn't always set the wipers in motion (it's pretty random). When I push it down a notch, the wipers goes into auto mode and that seems working, a further push down they go into continuous motion, a further push down (fast motion supposedly) and nothing, the wipers stop. So bottom line, the bottom position (fast continuous) does not work while the other positions seem to work OK. Any ideas?
I am having a similar problem. My wipers operate in AUTO. They do not operate in continuous slow or fast in the lower two positions of the stalk. Does anyone know how these are controlled? I have tried a substitute wiper control with the same result. The two fuses associated with wipers are OK. I do not have a wiring diagram so am at a loss.