What Causes the Wiper to Keep Running?
2 Answers
The wiper may not stop working due to a short circuit in the wiring, sensor malfunction, or accidental switch activation while driving. Analysis of Automatic Wiper Operation: Accidentally activating the window washer switch may cause the wiper motor to run approximately 3 cycles as programmed to clean the glass; vehicles equipped with automatic rain-sensing sensors may malfunction, falsely detecting heavy rain and activating automatically; a short circuit in the wiper switch wiring may directly power the wiper motor, preventing it from stopping—this is abnormal and requires inspection of the wiper-related circuits. Solutions: When turning off the wiper, ensure it returns to the initial position; stopping it abruptly may obstruct the driver's view and compromise safety; for vehicles with automatic rain-sensing sensors, a faulty sensor requires replacement or inspection of its wiring; since wiper control is managed by the body control module, a program error in the module sending incorrect commands necessitates inspection of the body control module.
Last time my car's wipers kept wiping non-stop. I suspect the switch button was stuck or had poor contact, as this often happens in humid weather. Additionally, the relay might have aged and stuck, keeping the circuit powered continuously. If the wiring is short-circuited or worn and grounded, it could also cause loss of control. If this issue isn't resolved, the wiper motor might overheat and burn out, and it also wastes battery power. I tried checking it myself a few times by turning off the wiper switch or pulling the fuse as an emergency measure, but in the end, I had to take it to the repair shop. Non-stop wipers are quite annoying, especially on sunny days when they just scrape the glass and affect visibility. I recommend not delaying—first try manually turning off the switch, and if that doesn't work, go for a professional car inspection to avoid bigger problems.
