B2B0311 - TroubleshootingB2B0311-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
B2B0311	Rearview mirror deployment C4 short circuit to ground or open circuit后视镜展开C4短路到地或开路	1. The wiring harness of the rearview mirror folding motor is abnormal.1.后视镜折叠电机线束异常
		2. The rearview mirror folding motor is abnormal2.后视镜折叠电机异常

Troubleshooting steps故障诊断步骤

①General inspection (take the left front door rearview mirror as an example)一般检查(以左前门后视镜为例)
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 left front door rearview mirror wiring harness for damage, breakage, etc.检查左前门后视镜线束是否存在损坏、断裂等现象。 3. Check the left front door rearview mirror wiring harness connector for damage, loose connection, etc.检查左前门后视镜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 faulty wiring harness or connector.维修或更换故障线束或接插件。
②Check the left front door rearview mirror deployment harness检查左前门后视镜展开线束
	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 FL06 and the left front door control module harness connector FL18.断开右前门后视镜线束接插件FL06和左前门控制模块线束接插件FL18。 3. Use a multimeter to measure the resistance between pin 4 of the FL06 and ground.使用万用表测量FL06的4号针脚与接地之间的电阻。 Standard resistance value: >1M标准电阻值：＞1M Ω
	d. Use a multimeter to measure the resistance between pin 4 of FL06 and pin 3 of FL18.d.使用万用表测量FL06的4号针脚与FL18的3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 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 4.去步骤4。
④Replace left front door control module更换左前门控制模块
1. Replace the left front door control module with a new one and check whether the fault code and symptoms are eliminated.更换新的左前门控制模块，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 left front door control module, you need to use a diagnostic tool to recalibrate the left front door control module.更换左前门控制模块后，需用诊断仪对左前门控制模块重新标定。