U16AE86 - TroubleshootingU16AE86-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
U16AE86	The blind spot indicator LED warning light in the left exterior rearview mirror cannot light up.左外后视镜盲区指示LED报警灯无法点亮	1. FLDCM exterior rearview mirror warning light failure1.FLDCM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 whether the left exterior rearview mirror blind spot indicator LED warning light wiring harness is damaged or broken.检查左外后视镜盲区指示LED报警灯线束是否存在损坏、断裂等现象。 3. Check the left exterior rearview mirror blind spot indicator LED warning light wiring harness connector for loose connection or damage.检查左外后视镜盲区指示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 left exterior rearview mirror blind spot indicator LED warning light power harness检查左外后视镜盲区指示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 left front door rearview mirror harness connector FL07 and the left front door control module harness connector FL16.断开左前门后视镜线束接插件FL07和左前门控制模块线束接插件FL16。 3. Use a multimeter to measure the resistance between pin 1 of FL07 and pin 26 of FL16.使用万用表测量FL07的1号针脚与FL16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 left exterior rearview mirror blind spot indicator LED warning light grounding harness检查左外后视镜盲区指示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 left front door mirror wiring harness connector FL07.断开左前门后视镜线束接插件FL07。 3. Use a multimeter to measure the resistance between pin 2 of the FL07 and ground.使用万用表测量FL07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 left front door mirror检查左前门后视镜
1. Replace the left front door mirror with a new one and check whether the fault code and symptoms are eliminated.更换新的左前门后视镜，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 left front door control module fault code检查左前门控制模块故障码
1. Use a diagnostic tool to read the fault code of the left front door control module and check whether there is a fault in the left front door control module.使用诊断仪读取左前门控制模块故障码，检查左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 left front door control module fault according to the fault code.根据故障码排除左前门控制模块故障。
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 left rear blind spot monitoring main sensor更换左后盲区监测主传感器
1. Replace with a new left rear blind spot monitoring main sensor and check whether the fault code and symptoms are eliminated.更换新的左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 left rear blind spot, you need to use a diagnostic instrument to recalibrate the main sensor for monitoring the left rear blind spot.更换左后盲区监测主传感器后，需用诊断仪对左后盲区监测主传感器重新标定。