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A Chevrolet mileage with a mileage of about 8500km and a 3.2L engine. User response: the reversing radar fault lamp on the vehicle meter is on. Fault diagnosis: Kopacz's assembled reversing radar system, also called the PAS, is an electronic system used to make sound during low speed operation such as a car, indicating the presence of obstacles in the rear or near the rear of the vehicle. The car auxiliary system consists of 4 ultrasonic sensor assemblies mounted on the rear bumper skin, 1 electronic control modules installed on the inside of the right rear wheel hood and the buzzer assembly installed in the instrument table below the steering wheel. Sonar detects the presence of obstacles in a specific area by measuring the time difference between the emitted and received acoustic signals. When the R is used, the sensor sends short ultrasonic pulses, and then receives echoes reflected by objects in the range. The electronic control module uses the echo data from one or more sensors to calculate the distance from the obstacle. The PAS control module can not communicate with the diagnostic instrument TECH2, but the system has a sensor fault self checking function, which can check all the rear object sensors. The activation step is to put the ignition switch in the ON position and 10s, and lock and unlock the handle of the car brake system for more than 3 times, so as to make the parking light. Switch on / off more than 3 times. If the sensor circuit fault is not detected, the buzzer will ring the regular alarm of 0.3s once. If the sensor circuit fault is detected, the buzzer will issue different sounds according to the following corresponding relations. Left corner sensor: pause 1s after each 40ms hint; left middle sensor: pause after every two continuous 40ms hints; right intermediate sensor: pause after every 3 continuous 40ms hints; right corner sensor: stop 1s after every 4 consecutive 40ms hints. As long as 1 sensors fail, the whole system will stop working. According to the above method and circuit diagram (as shown in Figure 7), the sensor fault check mode is started, and the buzzer stops 1s after every two continuous 40ms hints, and a total of 6 cycle cycles are rounded. It shows that the middle sensor of the left side is out of order, and the sensor is detected to the PAS control module. The analysis is likely to be the internal fault of the sensor itself. Troubleshooting: Troubleshooting after replacing the left middle sensor (radar).