Why is one wiper moving while the other is not?
3 Answers
One wiper moving while the other is not may be due to the wiper linkage coming off or the motor linkage arm joint becoming detached. Additional information: The wiper assembly consists of the wiper motor, linkage rod, wiper frame, wiper blade, and wiper relay switch. Inspection method: Open the engine hood to observe if the transmission linkage is dislocated (this is the most common cause). Check if the fuse is intact. Disconnect the motor wire plug, turn on the power, and use a multimeter to measure if there is voltage. If the fuse is intact but there is no voltage at the motor, check if the turn signal combination switch is functioning properly. Generally, a burnt motor will have a scorched smell. If normal voltage is measured at the wiper motor when the power is turned on, consider the condition of the motor. Pay attention to whether the connecting rod is properly attached to the wiper arm. Some arms are fixed to the wiper arm with screws, while others are locked with snap fasteners.
Once when I was driving, the right wiper moved while the left one didn't, which really worried me. This isn't a minor issue—it usually indicates an internal failure in the wiper system. The most common cause is a problem with the linkage mechanism, which may have loosened or worn severely, causing power to be transmitted to only one wiper arm. If the wiper motor's gears slip or are partially damaged, it can also leave the other side immobile. Another frequent issue is a loose fixing screw on the wiper arm, causing it to detach during operation. In such cases, visibility becomes dangerously poor during heavy rain. I've experienced this myself—initially thinking the wiper blade was stuck, but replacing it didn't help. A shop inspection later revealed a broken linkage. The repair cost isn't high, but don't delay it too long. Regularly washing your car to prevent debris buildup on the wipers can help avoid similar failures.
When I encountered the issue of one wiper not moving, I first tried to troubleshoot it myself. The first step was to turn off the wiper switch and restart it to see if it could reset properly. If that didn't work, I gently pulled the non-moving wiper arm to feel for any resistance or looseness; sometimes it's due to a jammed mechanism or a disconnected linkage. Unusual noises like grinding often indicate internal gear issues in the motor. It's also important to check the wiring connections to see if any loose plugs are causing a power interruption. Before the rainy season, cleaning leaves or bird droppings off the wiper blades is crucial, as debris can clog and overload the mechanism. If all else fails, head straight to the repair shop. Remember, the wiper system is simple in structure, and DIY fixes for minor issues aren't hard, but if you're unsure, it's best to consult a professional for peace of mind. It's both cost-effective and practical.
