Why does the car wiper keep wiping and cannot be turned off?
2 Answers
If the car wiper keeps wiping and cannot be turned off, it might be in automatic mode. Here are specific details about the wiper: 1. Operating Principle: The power source of the wiper comes from the motor, which is the core of the entire wiper system. The quality requirements for the wiper motor are quite high. It uses a DC permanent magnet motor, and the wiper motor installed on the front windshield is generally integrated with the worm gear mechanical part. The function of the worm gear mechanism is to reduce speed and increase torque. Its output shaft drives the four-bar linkage, which converts continuous rotational motion into left-right swinging motion. 2. Gears: It has three settings—low speed, high speed, and intermittent.
Last time my car had the same issue, the wipers wouldn't stop on their own, which was extremely frustrating. I figured it might be that the wiper switch got stuck in the ON position and didn't fully return when turned off. Or perhaps the wiper relay was stuck—it controls the motor's operation, and if it jams, the wipers won't stop. A short circuit in the wiring could also cause signal disruption; for example, water ingress in the door wiring harness might trigger this problem. Issues with the motor itself shouldn't be overlooked either, such as a seized linkage or a burnt-out motor. As a last resort, you could pull the fuse for an emergency fix, but make sure to check the manual for the correct location—removing the fuse cuts power to the wipers, stopping them. This situation definitely requires repair; driving with the wipers on, especially on the highway, puts excessive strain on the motor and drains the battery. Don't take it lightly—while getting it fixed, it's wise to have other components checked for peace of mind.
