故障现象一辆波罗劲情轿车,累计行驶里程约为1万km,客户反映驾驶人侧的车窗能正常升降,其他3个车窗都是有时能升降有时不能升降。故障诊断及排除接车后检查各车窗的升降情况,确实如客户所述。连接VAS5051读取各系统的故障代码,都没有故障代码。波罗劲情轿车的车窗升降器的开关信号首先到左前车门控制器,经左前车门控制器处理后通过数据线LIN线到其他车门。根据以往的经验,出现这种故障一般都是因为左前车门的线和车身连接器进水造成接触不良引起的。首先检查该连接器,并未发现有进水的痕迹,插接良好,用万用表测 Fault phenomenon A Polo Jinli sedan, the cumulative mileage of about 10,000 km, the customer reflects the driver’s side of the window can be normal movements, the other three windows are sometimes able to lift sometimes can not lift. Troubleshooting and check the car after the lift check the situation, indeed, as customers said. Connection VAS5051 read the fault code of each system, there is no fault code. Polo Jin car sedan window switch signal to the left front door controller, the left front door controller after the data line through the LIN line to other doors. According to past experience, this failure is generally caused by the left front door line and body connector caused by poor water contact. First check the connector, did not find signs of water, good plug, with a multimeter test