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故障现象一辆宝马730Li(E66)轿车,在接通点火开关后,轮胎气压黄色警告灯报警,在显示器上显示轮胎气压报警系统故障,而且不能进行轮胎气压复位。故障诊断查阅资料得知,该车的轮胎压力报警系统是欧规的,报警原理是CIM(底盘集成模块)根据DSC(动态稳定控制系统)发过来的4个轮速信号来确定轮胎是否失压,而非欧规车则是通过轮胎压力来确定轮胎是否失压。利用ISID进行测试,能检测到CIM,可以判断其通讯是正常的,也就是说CIM的电源供给情况,以及K-CAN均是正常的,但是为了保
Fault phenomenon A BMW 730Li (E66) sedan, the ignition switch is turned on, the tire pressure yellow warning lights alarm on the display tire pressure alarm system failure, and the tire pressure can not be reset. Fault diagnosis Access to information that the car’s tire pressure alarm system is European regulations, the alarm principle is CIM (Chassis Integration Module) according to DSC (Dynamic Stability Control) issued by the four wheel speed signal to determine whether the tire pressure loss , While the non-European car is through the tire pressure to determine whether the tire pressure loss. Test using ISID, CIM can be detected, you can determine the communication is normal, that CIM power supply, and K-CAN are normal, but in order to protect