What is the P signal on the bus?

A P+ signal on the bus The P+ signal on the bus is the sign of the reversing radar, which is generally green. The reversing radar is turned on by default, that is, the car is turned on every time it is ignited. Cars usually have a button to control the switch. Click Close, and then click Open. Vehicles with reversing radar function will make a sound when there are obstacles around them, and then the sound and frequency will vary according to the distance. The closer to the obstacle, the louder the sound and the higher the frequency; If you stay away from obstacles, the sound will be lower and the frequency will be lower. With the reversing radar, it can reduce the trouble caused by the driver starting the vehicle before and after parking, help the driver eliminate the defects of blind spots and blurred vision, and improve driving safety. For example, there is an obstacle under the car that the driver can't see. At this time, the reversing radar will call the police. Introduction of parking radar: The full name of parking radar is "parking anti-collision radar", also known as parking radar and parking assist device, which is a safety assist device when parking or reversing. The working principle is to detect the distance between the car body and the obstacle by ultrasonic positioning echo, and then prompt it by sounds of different frequencies.