A Toyota Prado accident car, the car in the repair after the left rear power window control switch can control the window movements, but no automatic control of lifting and anti-folder function, while the driver's side of the main switch can not control the left rear power window Lifting the fault, the other windows automatically control lifting and anti-folder function is normal.
    To repair the car's fault, the car should be the power window system control principle to understand. The car is equipped with the body of the local area network, the power window control network is composed of multiple transmission network main switch (built on the driver's side door), front passenger side multiple transmission network switch (built in the front passenger side door), rear door Road transmission network switch (built in the rear left and right side of the door) and MPX (body multi-channel control) ECU components. The power window motor assembly is composed of a Hall sensor, a gear part and a main body of the electric window motor. The motor is controlled by the main switch of the multiple transmission network and the corresponding multi-channel transmission network switch. When the multiplexer network switch or the door multiplex network switch is pressed, the switch will transmit the lift signal to the corresponding door control unit through the BEAN communication line, and then control the lift of the power window by the door control unit. The output signal of the Hall sensor on each power window motor is transmitted to the multiplex network switch. The multi-network transmission switch detects the window position by the pulse signal count and determines the movement direction of the window by the pulse signal phase difference Power window of the automatic lifting and anti-folder function.
    Since the other windows of the car can achieve automatic lifting function, but the left back door can not, then the scope of the fault can basically be determined in the left rear door and left rear door associated with the line. To this end, maintenance personnel first check with the power window system circuit and body network-related fuses, but are normal. Later, the maintenance staff found in the inspection, the left rear door control switch on the regular light flashing, and this car's power window system can control the switch on the indicator light shows the system fault code, so the maintenance staff decided to Flashing the fault code to determine the specific point of failure. After checking the maintenance manual, that the indicator light flashing the meaning of the fault code for the pulse sensor circuit failure. According to the prompt code, the maintenance personnel of the power window motor pulse sensor was checked, the results of the pulse sensor power supply is 13V normal, check the two pulse sensor signal output wire, and the body without short circuit phenomenon.
    In order to accurately and quickly determine whether the power window motor is damaged, the maintenance personnel decided to use the oscilloscope to analyze the output signal waveform of the power window motor. Then, the 2-channel oscilloscope was used to measure the output of the PLS1 and PLS2 terminals Signal waveform. As the maintenance manual does not provide the standard waveform, the maintenance personnel measured the right rear door power window motor running the waveform for reference. By contrast, it is found that the signal waveform output at the left rear window power window motor is running, thereby determining that the power window motor is damaged.
    After replacing the power window motor assembly, we made the initial setting of the pulse sensor. Set the method as follows: Turn on the ignition switch (ON or IG position), use the switch to open the power window to half (the window falls to 1/2 position) to push the switch completely until the power window is completely closed, After the window is completely closed, keep the switch for 1s or longer. After the setup is complete, troubleshooting.
    Attachment: After the power window switch operation, the switch indicator flashes.
    Mode 1
    After the power window switch operation flashes for about 43s, and then lit again, this time anti-folder function does not work area deviation from the specified area (down), anti-folder function does not work area: off the window off position 4mm.
    Mode 2
    The power window switch flashes for about 43 seconds and then lights up again, and the pulse sensor circuit (Hall IC) in the power window motor is faulty.
    Mode 3
    After the power window switch operation flashes continuously until the ignition switch is turned off, the above fault occurs at the same time, and the battery terminal should be reconnected.