U184287 - TroubleshootingU184287-故障诊断

Fault code description故障码说明

DTC故障码(DTC)	Fault code description故障码描述	Possible cause of failure可能故障原因
U184287	There is a fault in the IBCM anti-tamper authentication message and the message is lost.IBCM防拆认证报文存在故障，报文丢失	1.IBCM device bus offline1.IBCM设备总线离线
		2.ETC device bus offline2.ETC设备总线离线

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the BCAN communication harness is damaged or broken.检查BCAN通讯线束是否存在损坏、断裂等现象。 2. Check whether there is any loose connection or damage to the wiring harness connector.检查线束接插件是否存在虚接、损坏等现象。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 2.去步骤2。 No否 Repair or replace the faulty communication harness.维修或更换故障通讯线束。

②Power on check上电检查

1. Repower the vehicle, use the diagnostic tool to read and clear the fault codes, and check whether the fault codes and symptoms are eliminated.车辆重新上电，使用诊断仪读取并清除故障码，检查故障码及症状是否排除。 Are the test results normal?检查结果是否正常？ Yes是 Fault resolved.故障排除。 No否 Go to step 3.去步骤3。

③Check for electromagnetic interference检查电磁干扰

1. Check for sources of magnetic fields around the vehicle.检查车辆周围是否存在磁场源。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 4.去步骤4。 No否 Move the vehicle away from its current environment.使车辆驶离当前环境。

④Check IBCM fault code检查IBCM故障码

1. Use the diagnostic tool to read the IBCM fault code and check whether the integrated body control module is faulty.使用诊断仪读取IBCM故障码，检查集成式车身控制模块是否存在故障。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 5.去步骤5。 No否 Troubleshoot the integrated body control module according to the fault code.根据故障码排除集成式车身控制模块故障。

⑤Replacing the integrated body control module更换集成式车身控制模块

1. Replace with a new integrated body control module and check whether the fault code and symptoms are eliminated.更换新的集成式车身控制模块，检查故障码及症状是否排除。 Are the test results normal?检查结果是否正常？ Yes是 Fault resolved.故障排除。 No否 Go to step 6.去步骤6。   Caution:注意： ♦  After replacing the integrated body control module, you need to use a diagnostic tool to recalibrate the integrated body control module.更换集成式车身控制模块后，需用诊断仪对集成式车身控制模块重新标定。

⑥Replacement of ETC on-board unit更换ETC车载单元

1. Replace with a new ETC on-board unit and check whether the fault code and symptoms are eliminated.更换新的ETC车载单元，检查故障码及症状是否排除。 Are the test results normal?检查结果是否正常？ Yes是 Fault resolved.故障排除。 No否 Look for causes from other symptoms.从其他症状查找原因。   Caution:注意： ♦  After replacing the ETC vehicle-mounted unit, the ETC vehicle-mounted unit needs to be recalibrated with a diagnostic instrument.更换ETC车载单元后，需用诊断仪对ETC车载单元重新标定。