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New C5 owner (5 Days old), Yesterday it rained for the first time since the purchase. When the wipers are on delay they delay at the top of the stroke. In other words they wipe all the way up and then start the trip back to the hood and stop about 10 degrees off of vertical, almost between my eyes. They seem to go back down fine when I turn the wipers off.
Try to check the windshield cowl drain udders. If the udders clog up, it will flood the wiper control module and the wipers will do some STRANGE STUFF!!