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replace that black box on the wiper motor or sometimes you have to replace the motor itself
The worm gear that runs it is stripped, Replace the motor.
Windshield wipers were invented in the year of 1903 by an American man named J. H. Apjohn.sources: wikipedia
The windscreen wiper aka windshield wiper was invented in 1903 by Mary Anderson
air con on hzj79 not getting power were are the fuses?
On the back of the engine right below the windshield wipers
There are several things that can cause your windshield wipers not to work. The most common cause is a malfunctioning windshield wiper motor.
replace a windshield wiper switch on a 1995 chevy lumina van
The intermittent wiper switch for your front winshield wipers is located on your turn signal stalk - which is just part of the multi-function switch. When mine started acting up I took it to the dealer and let them change it.
The windshield wiper relay switch, on your 1999 Cadillac Deville, are located mounted to the firewall in the engine compartment. The relay switch will be next to the windshield wiper motor.
I would suspect the wiper switch is defective. Replace it. Salvage yard is a good source for this part. In the interim, pull the fuse to stop the wipers when they are in the down position.
The fuse is next to the parking brake. If it has a relay, its in the under hood relay box near the windshield wipers.