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故障现象一辆奔驰R350车(采用W251底盘),行驶里程约为5万km,客户反映,该车有时锁车后会自动报警。故障诊断接车后,用遥控器操作闭锁和解锁,均正常。锁车后,放置一段时间,并没有出现自动报警的现象。询问客户得知,该车出现异常报警是无规律可言的,有时锁车一会儿就会自动报警,有时放一两天后才会报警。由于未能再现故障现象,就先连接故障检测仪读取故障代码,在车顶控制单元内调得的故障代码如图1所示。
Fault phenomenon A Mercedes-Benz R350 car (using W251 chassis), mileage is about 50,000 km, the customer reflects the car sometimes automatically alarm when the car is locked. Troubleshooting After the car is docked, it is normal to operate the lock and unlock with the remote control. Lock the car, place for some time, and there is no automatic alarm phenomenon. Ask the customer to know that the car abnormal alarm is irregular at any time, and sometimes lock the car will automatically alarm, sometimes one or two days after the alarm. Failure to reproduce the fault phenomenon, connect the fault detector to read the fault code, tune in the roof control unit fault code shown in Figure 1.