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The mileage is about 40 thousand km, which is CC6460KM29's the Great Wall HAV in 2010. According to the driver, the right rear window glass can only rise and can not fall. In other repair plants, the right rear window switch, the right rear window glass anti clamp module and the right rear window glass elevator motor have not been eliminated. Fault diagnosis: first, verify the failure phenomenon after receiving the vehicle. The window main switch of the driver side is repeatedly operated, and the window glass of the 4 doors can be normal and down. From this, it is inferred that the window glass anti clamp module and the window glass elevator motor are normal, and the window switch on the right rear door is repeatedly operated and the window glass of the right rear window can rise normally, but sometimes it is impossible. The reason for the failure of the vehicle is that the rear rear window switch or its associated circuit may be faulty. Considering that the former maintenance personnel have changed the right rear window switch, the inspection focus is placed on the line between the right rear window switch and the right rear window glass elevator motor. In view of the electric window control circuit of the car, the window main switch controls the window glass of each door through the LIN line, and the window glass of the left rear, right front and right rear doors can also be lifted by the window switch on the corresponding door. In addition, the main switch of the window and the right front window switch also have middle control unlocking and locking work. Yes. As an example of the right front window switch and the right front window glass anti clamp module, the right front window switch terminal 6 is responsible for transmitting the unlocking signal to the body control module (BCM), and terminal 7 is responsible for sending the middle control locking signal to the BCM, and terminal 1 is responsible for sending the window glass rising signal to the right front window glass anti clamp module, and terminal 4 is responsible for the front right forward. The window glass anti clamp module sends the window glass drop signal; the right front window glass anti clamp module (LIN line from the node) terminal 3 is the LIN line communication terminal, which is responsible for receiving the window glass lifting signal of the main switch of the car window (the main node of the LIN line). In addition to the function of the right front window switch, the right rear window switch has the same function as the right front window switch, of which terminal 1 is the power supply terminal, terminal 5 is the iron lap terminal, terminal 3 is responsible for sending the window glass rising signal to the right rear window glass anti clamp module, and terminal 6 is responsible for the right rear window glass anti clamp module. The function of the rear window glass anti blocking module is the same as that of the right front window glass anti blocking module. According to the fault phenomenon of the car and the working principle of the electric window, it is inferred that the line between the right rear window switch and the right rear window glass anti clamp module may be malfunction. Disassemble the interior trim board of the right rear door, remove the right rear window glass anti clip module wire connector, iron the end of the meter pen, and the other end to the right rear window glass anti clip module wire connector terminal 6 (the window glass drop signal terminal), repeatedly operate the right rear window switch, and the multimeter displays the signal voltage of about 9.6 V. Normal, indicating that the right rear window switch and its circuit are all normal. The diagnosis is so deadlocked that the right rear window glass anti clamp module is damaged and can only normally receive the lifting signal of the main switch of the window, and can not accept the lifting signal of the right rear window switch. Although the previous maintenance personnel changed the right rear window glass anti clamp module, but the insurance, again after the replacement of the right rear window glass anti clip module test, not a few times, the right rear window glass can not drop. Before the repair process was combed, it was found that a possible cause of failure was missing. Although the window glass drop signal from the right rear window switch is normal when it is removed from the right rear window glass anti clamp module wire connector, the window glass anti clamp module can not receive the window glass drop signal if the window glass anti clamp module wire connector is not connected with the window glass anti clamp module. After the window glass anti clamp module wire connector is carefully checked, the appearance is normal, the window glass anti clamp module wire connector is connected after the test, the fault is still in the car, the right rear window switch is manipulated while the window glass King leaves the anti clamp module wire connector, when the sloshing to the right is disappearing, so when wobble to the left, so the left sloshing when the left wobble when the left wobble when the left wobble when the left wobble when the left, so when sloshing left to left reason why Barrier reappearance, therefore, it is determined that there is something wrong with the connector of the window glass clamping module. Troubleshooting: use the tool to move the right rear window glass anti clip module wire connector terminal 6, and find that the terminal will move backward obviously. After readjusting the terminal to test the car again and again, the window glass of the right rear window is restored to normal, and the fault is ruled out. Fault analysis: the right rear window glass anti clamp module wire connector terminal 6 looseness, disconnect the connector to measure the window glass drop signal normal, but after the window glass anti clip module connection, the terminal will move backward, so that the window glass anti clamp module sometimes can not receive the window glass drop signal, so that right rear window sometimes It can't fall. The reason for this car fault is very simple, but the whole diagnosis process is very difficult, which shows that the diagnosis idea is not reasonable enough. Here, I hope that the majority of the maintenance personnel can notice this: if a system has a fault, the system is decomposed into A and B two parts for inspection, if the detection found that the two parts of A and B are normal, then it is likely that the connection between A and B is a problem. In addition, I think that the right rear window glass anti clip module wire connector terminal 6 is loosened. It is likely that the method of disassembly or installation of the maintenance personnel is not correct in the previous maintenance vehicles. Therefore, the author also reminds the majority of the maintenance personnel, in the maintenance of vehicles, not only have reasonable maintenance ideas, but also have proper maintenance. The exact method of operation.