What is the reason for the Golf's reverse radar not responding?

[StDavid]

Golf's reverse radar not responding is caused by the poor working performance of the reverse radar control unit itself; it is also caused by abnormal connections of related wiring. The following are relevant introductions: 1. The principle of reverse radar: The reverse radar emits ultrasonic waves through ultrasonic sensors, and after the ultrasonic waves hit an obstacle, they are reflected back and received by the ultrasonic sensors. The controller then calculates the distance between the vehicle and the obstacle based on the time of ultrasonic emission and return, and finally alerts the driver with rapid beeps from the buzzer. 2. The main functions of the reverse radar: Accurately measure the distance between the rear of the vehicle and the nearest obstacle; when reversing to the limit distance, it can emit rapid warning sounds to remind the driver to pay attention to braking; it can repeatedly emit voice warning sounds to remind pedestrians to pay attention.