The reverse warning tone is intermittent. Reason: 1. The host power cord is not connected correctly. The specific inspection method is to check whether the backup light is on when reversing, and if it is not, check the backup light switch; Remove the liner on the right side of the trunk and test the connection and disconnection of the radar cable; Open the fuse box and check the on-off state of the related fuse of the reversing radar with a multimeter. The buzzer is out of order. Make sure it's a buzzer. Just go to the 4s shop and change it. 3. The circuit of the reversing radar was damaged during the car modification. If there is a problem with the reversing radar line due to the modification of the car, it is necessary to go to the 4S shop or repair shop of the car in time for maintenance or replacement of the reversing radar line of the car, which can solve the problem that the reversing radar of the car does not sound. Generally speaking, obstacles 10~ 15cm below the probe center may be ignored by the probe. The closer the obstacle is to the parking space, the lower the height value and the higher the risk. Because the acoustic signal emitted by radar probe is narrow, there is a large blind area when detecting small obstacles. In order to ensure the safety of daily use, after finding the problem of missing prompt tone, we must find the reason in time and go to 4s shop to solve the related problems.