B378031 - TroubleshootingB378031-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
B378031	DMS camera has no signalDMS摄像头没有信号	1. The camera LVDS wiring harness is damaged1.摄像头LVDS线束损坏
		2. The camera connector is loose2.摄像头接插件松动
		3. The camera is damaged3.摄像头损坏

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 driver status monitoring camera wiring harness for damage, breakage, etc.检查驾驶员状态监测摄像头线束是否存在损坏、断裂等现象。 3. Check the driver status monitoring camera harness connector for loose connection or damage.检查驾驶员状态监测摄像头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 faulty wiring harness or connector.维修或更换故障线束或接插件。

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 driver status monitoring camera LVDS communication cable检查驾驶员状态监测摄像头LVDS通讯电缆

1. Check whether the LVDS communication cable of the driver status monitoring camera is normal.检查驾驶员状态监测摄像头LVDS通讯电缆是否正常。 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 Repair or replace the LVDS communication cable of the driver status monitoring camera.维修或更换驾驶员状态监测摄像头LVDS通讯电缆。

⑤Replace driver status monitoring camera更换驾驶员状态监测摄像头

1. Replace the driver status monitoring camera with a new one and check whether the fault code and symptoms are eliminated.更换新的驾驶员状态监测摄像头，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。

⑥Replacement 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。