What Causes the Car Wiper to Keep Running Nonstop?
3 Answers
When the car wiper keeps running nonstop, it is usually due to a fault in the wiper motor's circuit. When the driver operates the wiper handle, the demand signal is transmitted to the BCM (Body Control Module). The BCM then sends a start signal to the wiper motor, which controls the movement of the wiper arm to perform the corresponding action. The driver can disconnect the negative terminal of the battery to stop the wiper. Without activating the wiper handle, the car should be driven to a repair shop or 4S store to check for wiring issues. The power source of the wiper comes from the motor, which is the core of the entire wiper system and has stringent quality requirements. Typically, a DC permanent magnet motor is used, and the wiper motor installed on the front windshield is usually integrated with the worm gear mechanical assembly.
Let me tell you about the windshield wipers that wouldn't stop. Last time I was driving in heavy rain, the wipers suddenly went crazy and wouldn't stop. At first, I thought the switch was broken, but the mechanic later told me there are four common causes: First, the wiper switch might be stuck in the on position due to dust or button wear. Second, the relay could be faulty—that little box controls the current, and if it's broken, the wipers won't stop. Third, there might be a short circuit in the wiring, like corroded or aged connection points. Fourth, the wiper motor itself could be short-circuited or jammed. In my case, it was a switch issue, and I fixed it by spraying some cleaner. But if it's serious, you might need to replace parts. You can try troubleshooting yourself: turn off the ignition and see if the wipers stop. If they do, it's likely a switch problem; if not, it could be the motor or relay. This is really dangerous when driving in the rain—it severely obstructs your vision. Don't delay; get it checked at a reliable repair shop as soon as possible.
As someone who frequently deals with cars, I think there could be many reasons why the wipers keep moving. The most common one is a malfunctioning switch, possibly due to long-term wear and tear causing the button to stick. Relay failures are also quite common—burned contacts or aging coils inside can cause continuous current flow. Wiring shorts are widespread too, especially after rain when moisture causes rust and short circuits at connection points. Sometimes improper modifications, like installing non-OEM parts, can also trigger this issue. For handling it, don't panic—first, turn off the engine to see if the wipers stop. If they do, check and clean or replace the switch. If they don't, inspect the relay and related fuses in the fuse box. Safety first—if the wipers keep running while driving, turn on the hazard lights, slow down, and pull over safely. Don't hesitate to visit a professional repair shop.
