Why does the reversing camera show a blue screen when reversing?
3 Answers
The reason why the reversing camera shows a blue screen when reversing is: the camera or video line is faulty. The reversing camera consists of a wide-angle camera, a control unit for transmitting signals, an MMI display, an information display control unit, a TV tuner, and a CAN data coordination bus. Its function is to allow the driver to see the situation behind the vehicle on the display when reversing, ensuring the safety of reversing. Methods for viewing the reversing camera: 1. The green line in the reversing camera generally indicates that the rear of the car is 2m away from the position shown by the green line, allowing for a U-turn or continued reversing; 2. The yellow line in the reversing camera represents that the parking space is 0.7 to 1m away from the position shown by the yellow line, requiring attention to deceleration; 3. When the red line in the reversing camera is about to touch the obstacle, the car must be stopped, as the position represented by the red line is only 30cm away from the rear of the car.
I often encounter similar issues when repairing cars. A blue screen in the reverse camera is usually caused by hardware connection problems, most likely due to loose or broken cables between the rear camera and the display, especially when the body shakes significantly during turning and reversing. It could also be caused by water or fog inside the camera or a dirty surface affecting signal transmission, which is more likely to trigger a blue screen after continuous rainy days or right after washing the car. Issues with the display itself, such as a cracked or aging internal screen, can also directly cause abnormal display. Additionally, the control module of the reverse system needs to be properly connected to the power source. If the car battery voltage is unstable or a fuse is blown, it may lead to image interruption. I recommend trying simple steps first: restart the engine while parked, as minor software glitches might resolve themselves. Then manually check the lens cleanliness and whether the cables are securely plugged in. If that doesn’t work, take it directly to a repair shop. They can use instruments to test circuit continuity, and replacing a new camera usually costs just a few hundred bucks, ensuring peace of mind and safety—after all, a blue screen makes it impossible to see behind the car, which can easily lead to scraping accidents.
As a frequent driver, I've personally experienced sudden blue screens in the reverse camera system. The causes vary, but the most common is dirt or grime on the surface of the reversing camera lens blocking light sensing, especially after driving on muddy rural roads where dust accumulation easily triggers the blue screen. Camera hardware failure is another factor, with aging plastic casings or internal component malfunctions preventing signal transmission to the in-car display. Wiring harness connections getting pulled during reversing, resulting in loose connectors or broken wires, also frequently occur. Additionally, incorrect settings in the reverse system itself, such as mistakenly switching input sources, can cause blue screens. The solutions are quite simple: manually clean the lens surface with a damp cloth to remove water marks; inspect cable connectors in the trunk to ensure clips are securely fastened; try restarting the vehicle to reset the system. If the issue persists, consult a professional mechanic immediately to avoid prolonged safety risks. This problem not only affects the camera display but can also cause the parking sensors to malfunction, so checking both systems simultaneously can lead to quicker functional recovery.
