Will an Unclosed Rear Window Cause Short Circuit if Water Gets In?
2 Answers
There are several scenarios when water enters through an unclosed rear window, which include: If only a small amount of water enters: It indicates minimal impact, but as a precaution, it’s best to avoid turning on any electronic devices inside the car, such as lights or starting the engine, to prevent short circuits due to water exposure. You can use the key to open the door, and if it’s still raining, cover the car with an umbrella or a waterproof tarp. If the electronic devices are unaffected: Simply take the car to a 4S shop for a drying treatment. If rainwater seeps into the carpet or floor mats: Remove them for cleaning and drying. After addressing the water accumulation, it’s also advisable to disinfect the interior to prevent lingering odors.
Once I forgot to close the rear window after parking, and rainwater poured in, soaking the back seats. Soon after, the trunk light started flickering, and the trunk switch malfunctioned. This was most likely caused by water-induced short-circuiting—when rainwater contacts wiring or control module interfaces, it can divert current flow, leading to overheating or blown fuses. Modern cars have many electronic components near the trunk area, such as the trunk lock, lighting system, and even audio wiring, all of which can short-circuit and overheat if submerged, posing a fire hazard. If this happens, immediately turn off the engine and disconnect the battery, then use a dry towel or vacuum to remove standing water. Check the fuse box for any blown fuses. Don’t forget to inspect the window seals—replace any that are worn out. Prevention is key: make it a habit to check if the rear window is closed before driving, and after rainy days, pay extra attention to any water accumulation in the car.
