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Why is there no sound from the car's reversing radar?

2 Answers

KiraDella

07/28/25 8:21pm

As a standard parking assistance system, the reversing radar helps us avoid dangers such as scratches and collisions during parking. The reversing radar emits ultrasonic waves through ultrasonic sensors, which reflect back after hitting obstacles and are received by the ultrasonic sensors. The controller then calculates the distance to the obstacle based on the time between the emission and return of the ultrasonic waves, and finally alerts the driver with a rapid beep from the buzzer. The reasons why the reversing radar may not produce sound include: 1. Obstacle is too low: When the obstacle is too low, the reversing radar may fail to detect its presence. 2. Obstacle is too thin: When encountering slender poles, the reversing radar may also fail to detect the obstacle. 3. Reversing radar switch is off: There is usually a switch on the central control panel inside the car that controls the reversing radar. If it is turned off, the reversing radar will not work. 4. Reversing radar wiring fault: When the wiring of the reversing radar is aged or broken, the reversing radar will not function properly. 5. Reversing radar is damaged: Components such as the reversing radar, controller, or alarm may be damaged.

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ORemington

08/12/25 1:08am

Last time my reversing radar suddenly went silent, and it took me quite a while to figure out the issue. First, I checked the fuse because unstable current often burns out this little thing. Then I found the radar sensor was covered in mud, a spot easily overlooked during car washes. I even specifically tested the buzzer—the multimeter showed normal voltage but it just wouldn’t make a sound, probably due to the speaker aging and going mute. Oxidized wire connectors can also cause poor contact, so I sanded the plugs with sandpaper to restore them. A reminder to everyone: pay extra attention after rainy days, as water seepage into the wiring can easily cause a short circuit. If you’re not familiar with circuits, don’t try to dismantle it yourself—finding a professional is the safest bet; they can pinpoint the problem in just five minutes.

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