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I am having the same issue with my 2003 bonneville. Changed out the control switch, no difference. Changed out wiper motor, still no difference. Seems that the problem may be on the wire for the delay. There is a constand 2.5 voltage when the switch is in the off position, cause the wipers to run intermitently. The wipers will run more often if you rev the car engine and increase the trace voltage. A wire is going to be added to bypass the bad wire in the harness. Crossing my fingers, hope this works.
if you look under the hood, locate the wiper motor. on the front are 3 torx head(star) screws holding a black cover abount 4' x 4'. once you unscrew those, look inside, that is your wiper module. very common for these to act this way. replace it. the dealer usually carries this in stock.
You can usually avoid that by using a good quality winter mix washer fluid that resists freezing, making sure the wipers are cleared of ice before beginning the drive and using the defroster to keep the windshield warm. In extreme conditions you just need to pull over and manually clean the ice off by hand.(only do that where it's safe). There are also specially designed wiper blades that will also help a bit.
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