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Well at least with the 201s and other models (not sure what ones exactly...) the wipers are controlled by a combo relay under the hood in the fuse box. This relay not only controls the wipers, but it also houses the turn signal flasher, and is the relay for the rear window defroster. I just replaced this relay in my car because the turn signals stopped working. By the looks of the insides, it appears the timing is done by either a timer IC chip, or the timed discharge of a capacitor. Either way, if you had schematics of the circuit, you could change a resistor or capacitor value to make the wiping delay longer or shorter. But to get over 3 speed settings would be more complicated, obviously.
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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K
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