U16BE86 - TroubleshootingU16BE86-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
U16BE86	The blind spot indicator LED warning light in the right exterior rearview mirror cannot light up.右外后视镜盲区指示LED报警灯无法点亮	1. FRDCM exterior rearview mirror warning light failure1.FRDCM外后视镜预警灯故障

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 right exterior rearview mirror blind spot indicator LED warning light wiring harness for damage, breakage, etc.检查右外后视镜盲区指示LED报警灯线束是否存在损坏、断裂等现象。 3. Check the right exterior rearview mirror blind spot indicator LED warning light harness connector for loose connection or damage.检查右外后视镜盲区指示LED报警灯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。
②Check the right exterior rearview mirror blind spot indicator LED warning light power harness检查右外后视镜盲区指示LED报警灯电源线束
	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 right front door rearview mirror harness connector FR07 and the right front door control module harness connector FR16.断开右前门后视镜线束接插件FR07和右前门控制模块线束接插件FR16。 3. Use a multimeter to measure the resistance between pin 1 of FR07 and pin 26 of FR16.使用万用表测量FR07的1号针脚与FR16的26号针脚之间的电阻。 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 3.去步骤3。 No否 Repair or replace the faulty wiring harness.维修或更换故障线束。
③Check the right exterior rearview mirror blind spot indicator LED warning light grounding harness检查右外后视镜盲区指示LED报警灯接地线束
	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 right front door rearview mirror harness connector FR07.断开右前门后视镜线束接插件FR07。 3. Use a multimeter to measure the resistance between pin 2 of the FR07 and ground.使用万用表测量FR07的2号针脚与接地之间的电阻。 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 4.去步骤4。 No否 Repair or replace the faulty wiring harness.维修或更换故障线束。
④Check the right front door mirror检查右前门后视镜
1. Replace the right front door mirror with a new one and check whether the fault code and symptoms are eliminated.更换新的右前门后视镜，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 5.去步骤5。
⑤Check the right front door control module fault code检查右前门控制模块故障码
1. Use a diagnostic tool to read the fault code of the right front door control module and check whether there is a fault in the right front door control module.使用诊断仪读取右前门控制模块故障码，检查右前门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 6.去步骤6。 No否 Troubleshoot the right front door control module fault according to the fault code.根据故障码排除右前门控制模块故障。
⑥Check the gateway controller fault code检查网关控制器故障码
1. Use a diagnostic tool to read the fault code of the gateway controller and check whether there is a fault in the gateway controller.使用诊断仪读取网关控制器故障码，检查网关控制器是否存在故障。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 7.去步骤7。 No否 Troubleshoot the gateway controller based on the fault code.根据故障码排除网关控制器故障。
⑦Replace the right rear blind spot monitoring main sensor更换右后盲区监测主传感器
1. Replace with a new right rear blind spot monitoring main sensor and check whether the fault code and symptoms are eliminated.更换新的右后盲区监测主传感器，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 main sensor for monitoring the right rear blind spot, you need to use a diagnostic instrument to recalibrate the main sensor for monitoring the right rear blind spot.更换右后盲区监测主传感器后，需用诊断仪对右后盲区监测主传感器重新标定。