One problem related to windshield wiper/washer has been reported for the 1997 Mercedes Benz 420. The most recently reported issues are listed below.
While driving about 65 mph in rainy weather windshield wipers would not activate when the switch was turned on. Vehicle was taken to dealership, where the fuses were checked. A control unit was replaced at owner's expense. Dealership offered to repair unit free if owner lefet the defected part.