故障现象一辆瑞风S5车,前刮水器不工作、车窗玻璃无法升降、前照灯不亮。故障诊断接车后,首先验证故障现象,故障属实。询问车主故障发生的经过,车主反映,该故障是在打翻了一瓶香水一两天后出现的,怀疑故障可能是由于香水腐蚀了BCM或相关线路导致的。经过分析该车车身控制电路,发现出故障的3个系统均是由BCM控制的,BCM通过CAN总线将 Fault phenomenon A Swiss S5 car, the front wiper does not work, the window glass can not lift, the headlamp does not light. Troubleshooting After the car is taken, first verify the fault phenomenon, the fault is true. Asked the owner of the failure occurred after the owners reflect the fault is knocked over a bottle of perfume a day or two after the suspected failure may be due to corrode the BCM or related lines caused. After analysis of the car body control circuit and found that the failure of the three systems are controlled by the BCM, BCM will be through the CAN bus