What is the reason why the navigation does not switch to the rearview image when reversing?
3 Answers
When reversing, the navigation does not switch to the rearview image. The possible reasons are: the trigger line on the navigation's reverse detection line and the video line of the reverse camera is not properly connected; the camera is damaged; the video power cable is aging or the chip's light sensitivity is poor. The rearview image is also known as the parking assist system, or the reverse visual system, or the vehicle monitoring system. It is necessary to check whether there is a fault in the circuit. Because the video power cable is aging, the navigation cannot switch to the rearview image when reversing. In this case, you can try to replace it with a new power cable. If the chip's light sensitivity is poor, you need to go directly to the repair shop for maintenance or replacement, but it is recommended not to do it yourself. Once the installation is not professional and mistakes occur, there will be safety hazards when reversing. The system is widely used in various large, medium, and small vehicles for reversing or driving safety assistance. When choosing a rearview image, you need to pay attention to whether it matches your vehicle model. You can consider the camera model, power voltage, screen size, whether it is waterproof, shockproof, and anti-interference. If it is used in a car, we can consider the camera model (you can choose whether it is waterproof and has night vision function), screen size (3, 5, 7 inches), power voltage (12V). Secondly, if it is a large vehicle, the choice must be cautious. First, the working conditions of large vehicles are quite different from those of cars. For example: the driving environment of construction roads is harsh, the temperature is harsh, the reverse gear is used frequently, and the working time is long. Second, the power voltage of large vehicles is generally 24V, so the rearview image of a car cannot be used.
I've encountered this issue before, and later found out that I accidentally turned off the reverse camera function. There's a reverse camera switch option in the car's settings menu, and sometimes it gets turned off by mistake. If the settings are correct, then you might want to check for poor wiring connections, especially since frequent opening and closing of the trunk can loosen the camera's wiring. Another common issue is the rear camera being covered in mud. After a rainy day, I once found the image completely blurred, but a quick wipe with a damp towel fixed it. It could also be a problem with the reverse trigger signal wire, which is connected to the reverse light circuit. If the reverse light fuse is blown or the wiring is aged, the car's system won't receive the switching signal. If all else fails, try rebooting the central control system by holding the power button for about ten seconds.
I recommend troubleshooting in three steps. First, observe if the screen shows any response when shifting into reverse gear. If there isn't even a black screen, it's likely a power or signal cable issue. Then, check the vehicle settings to see if the reverse camera function has been disabled - many new cars have it enabled by default but it might have been accidentally turned off. Finally, inspect the camera status, especially the lens on the rear bumper which is prone to getting dirty from mud and water kicked up by the rear tires. That's exactly what happened to my car last time - it worked fine after a wash. Also note that if it's an aftermarket navigation module, you'll need to verify if the protocol box supports the original vehicle signals. Many modern vehicle models can even display the reverse camera trigger logs in the infotainment system, making it easier to pinpoint the issue.
