B320B08 - TroubleshootingB320B08-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
B320B08	Ethernet communication error以太网通讯错误	1. Internal circuit failure1.内部电路故障
		2. The external Ethernet connector is not connected2.外部以太网接插件没连接

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Power state is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”，断开蓄电池负极。 2. Check the Ethernet harness connector for loose connections or damage.检查以太网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 wiring harness connector.维修或更换故障线束接插件。

②Check the Ethernet harness检查以太网线束

1. Power state is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”，断开蓄电池负极。 2. Check whether the Ethernet harness between the infotainment head unit and the gateway controller (Ethernet) is normal.检查车载智能多媒体主机与网关控制器(以太网)之间的以太网线束是否正常。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 3.去步骤3。 No否 Repair or replace the Ethernet harness.维修或更换以太网线束。

③Check the gateway controller (Ethernet) fault code检查网关控制器(以太网)故障码

1. Use a diagnostic tool to read the gateway controller (Ethernet) fault code and check whether there is a fault in the gateway controller (Ethernet).使用诊断仪读取网关控制器(以太网)故障码，检查网关控制器(以太网)是否存在故障。 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 Troubleshoot the gateway controller (Ethernet) fault according to the fault code.根据故障码排除网关控制器(以太网)故障。

④Replacement of infotainment head unit更换车载智能多媒体主机

1. Replace with a new infotainment head unit and check whether the fault code and symptoms are eliminated.更换新的车载智能多媒体主机，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 infotainment head unit, it is necessary to use a diagnostic instrument to recalibrate the infotainment head unit.更换车载智能多媒体主机后，需用诊断仪对车载智能多媒体主机重新标定。