Why Can't the Windshield Wiper Be Turned Off Occasionally?
3 Answers
Here are the specific reasons why the windshield wiper occasionally cannot be turned off: 1. The car's automatic mode might be turned on, causing the wiper to keep working whenever water falls on the windshield. 2. If the automatic mode is not turned on, the wiper might be malfunctioning and needs to be replaced promptly. 3. There could be an issue with the wiring, which can be fixed at a repair shop or a 4S store. 4. If the wiper switch is faulty and causes the wiper to keep running, a multimeter can be used for testing. Here is some additional information: 1. The power source of the wiper comes from the motor, which is the core of the entire wiper system. 2. The wiper motor uses a DC permanent magnet motor, and the motor installed on the front windshield is usually integrated with the worm gear mechanism. The worm gear mechanism serves to reduce speed and increase torque, and its output shaft drives a four-bar linkage, converting continuous rotational motion into a left-right swinging motion.
The wipers occasionally won't turn off, and I've encountered this issue several times, which is particularly annoying while driving. It's mostly likely a problem with the switch or relay. After years of use, the contacts in the switch may wear out or oxidize, sometimes getting stuck and failing to send the signal to turn off. The wiper circuit includes fuses, wiring, and a control module, with intermittent faults often caused by vibration-induced loosening or connector corrosion leading to poor contact. Once during heavy rain, the wipers wouldn't stop, and after pulling over, I checked the fuse—it was intact, but the switch was loose. Re-securing it fixed the issue. I also recommend inspecting the relay box for any burnt smell, as this is a common failure point in older cars. Short circuits or water ingress in the wiring can also cause intermittent faults. Safety comes first when dealing with such issues; avoid driving in the rain when visibility is compromised to prevent accidents. Regularly cleaning the switch to remove dust and moisture can extend its lifespan. If you notice any problems, get them checked and replaced at a repair shop as soon as possible. Remember, don't delay—safety is paramount in daily driving.
The wipers won't turn off occasionally, which is quite annoying, especially during long-distance driving. I've done some simple repairs myself and suspect the cause might be loose wiring or poor plug contact, where vibrations on bumpy roads lead to unstable connections. Internal wear in the switch could also cause the contacts to stick, continuously sending an on signal. Aging relays failing to cut off the current is a common trigger—using a multimeter to test for circuit breaks can help diagnose this. Another possibility is occasional motor jamming; if the wiper arms don't move smoothly or the rubber blades are worn, increased resistance may cause the system to misjudge. Before attempting repairs, disconnect the power to avoid accidents and try tightening all plugs and brackets. If that doesn't work, consider replacing the relay or switch. Remember to regularly clean the wiper arms and windshield area to prevent worsening issues. Routine maintenance saves money and hassle—after all, no one wants to scramble suddenly in the rain, compromising driving safety.
