What is the reason for the wipers not stopping?
2 Answers
The reasons for the wipers not stopping: 1. There is a problem with the wiper circuit; 2. The wiper combination switch is broken; 3. The negative pole of the wiper is connected to the car body. The working principle of the wiper is that when the wiper handle is operated to transmit the demand signal to the BCM (Body Control Module), the BCM inputs the start signal to the wiper motor, and then the wiper motor controls the movement of the wiper arm to perform the corresponding action. 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 issue of wipers not stopping can be quite annoying. I've encountered it several times, often due to the wiper switch being stuck in the on position. The internal contacts of the switch may have aged or gotten wet, causing it to stick and keeping the wipers moving. Another common cause is a stuck relay. The relay controls the power to the wiper motor, and if its contacts are welded due to arcing, the current remains continuous, preventing the wipers from stopping. There's also the possibility of a control module malfunction, such as software glitches or hardware damage, directly affecting signal output. Wiring issues, like a short circuit keeping the control circuit powered, can also be to blame. Driving safety shouldn't be overlooked—malfunctioning wipers can distract you, so it's best to pull over and check immediately or head to a repair shop. Try resetting the switch first; if that doesn't work, have a technician inspect the relay and module. Regular cleaning of the windshield and preventing water ingress into the switch can help prevent this issue.
