The DIO wiper has a maintenance mode. The model is developed for the convenience of maintenance personnel to replace scrapers. As long as the service mode of the wiper is opened, the wiper will automatically operate and stay at the position of 45 degrees with the angle of the bottom of the windshield glass. The specific operation methods for replacing scrapers by wiper maintenance mode are as follows. (1) connect the ignition switch and then break it. (2) turn the wiper switch downward and keep about 3S. Then the wiper maintenance mode is opened, and the wiper will run to the specified position. (3) after changing the scraper, switch on the ignition switch and then operate the wiper switch to reset the wiper.