What Causes No Video Signal in Car Rearview Camera?
2 Answers
When the rearview camera displays no signal, it is most likely due to poor line contact or aging of the video power cable. Extended information: Solution: It is necessary to promptly check the wiring and the connection points of the vehicle's installation to see if there is any loose connection. If there is, it will naturally cause abnormalities in the rearview camera. In this case, simply ensuring the loose connection is properly secured should resolve the issue. You can try replacing the power cable with a new one. If this solves the problem, it confirms that the issue lies with the video power cable. Special circumstances: Prolonged use of the rearview camera may lead to poor chip photosensitivity, resulting in a snowy screen effect. Of course, it could also be due to design flaws in the car's circuitry. However, issues like chip abnormalities and design defects are beyond the average person's ability to resolve and require inspection, repair, or replacement at a repair shop.
A while ago, my reversing camera screen went black, and it took me quite some time to figure out the issue. First, check if the camera itself is dead—lenses getting covered in mud or damaged by stones are common, especially on rainy days. Next, get under the car and check if the wiring harness connectors are loose; repeated opening and closing of the trunk can tug on the cables and cause problems. If the car has been modified, extra caution is needed—some low-quality cameras may fail outright due to unstable voltage. If this happens, don’t panic—turn off the engine, wait ten minutes, and restart it; an overheated head unit can also cut off the video signal. If all else fails, take it to a shop to read the fault codes with a diagnostic tool—sometimes the head unit system acts up and needs a software update. While checking, test the reversing radar too, as these two systems often share wiring.
