U014687 - TroubleshootingU014687-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
U014687	GWM message lostGWM报文丢失	1. CAN network connection abnormality1.CAN网络连接异常
		2.Lost GWM communication2.丢失GWM通讯

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Power status 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 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。 3. Check the BCAN communication harness connector for damage, loose connection, etc.检查BCAN通讯线束接插件是否存在损坏、虚接等现象。 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 BCAN communication harness检查BCAN通讯线束

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. Disconnect the power liftgate module harness connector and gateway controller harness connector.断开电动掀背门模块线束接插件和网关控制器线束接插件。 3. Use a digital multimeter to measure the resistance between the BCAN communication corresponding pins of the electric liftgate module harness connector and the gateway controller harness connector.使用数字万用表测量电动掀背门模块线束接插件和网关控制器线束接插件BCAN通讯对应针脚之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω 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 faulty wiring harness.维修或更换故障线束。

⑤Check the gateway controller检查网关控制器

1. Power status "OFF".电源状态“OFF”。 2. Connect the diagnostic tool.连接诊断仪。 3. Power status "ON".电源状态“ON”。 4. Use a diagnostic tool to check the gateway controller.使用诊断仪检查网关控制器。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 6.去步骤6。 No否 Repair the gateway controller.检修网关控制器。

⑥Replacing the power liftgate module更换电动掀背门模块

1. Replace the electric hatchback door module with a new one and check whether the fault code and symptoms are eliminated.更换新的电动掀背门模块，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 Look for causes from other symptoms.从其他症状查找原因。   Caution:注意： ♦  After replacing the electric liftgate module, you need to use a diagnostic tool to recalibrate the electric liftgate module.更换电动掀背门模块后，需用诊断仪对电动掀背门模块重新标定。