B100A12 - TroubleshootingB100A12-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
B100A12	The second row driver's side seat belt buckle has a short circuit to the power supply.第二排驾驶员侧安全带锁扣对电源短路	1. The second row driver's side seat belt buckle is short-circuited to the power supply.1.第二排驾驶员侧安全带锁扣对电源短路

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 second row left rear seat belt buckle harness for damage or breakage.检查第二排左后安全带扣线束是否存在损坏、断裂等现象。 3. Check the second row left rear seat belt buckle harness connector for damage, loose connection, etc.检查第二排左后安全带扣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 second row left rear seat belt buckle circuit检查第二排左后安全带扣线路
	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 airbag electronic control unit harness connector BD52 and the second row left rear seat belt buckle harness connector BD84.断开安全气囊电控单元线束接插件BD52和第二排左后安全带扣线束接插件BD84。 3. Connect the negative terminal of the 12V battery and the power status is "ON".连接蓄电池负极，电源状态“ON”。 4. Use a digital multimeter to measure the voltage between pin 1/2 of the BD84 and ground.用数字万用表测量BD84的1/2号针脚与接地之间的电压。 Standard voltage value: 0V标准电压值：0V 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 second row left rear seat belt buckle harness.维修或更换第二排左后安全带扣线束。
③Replace the second row left rear seat belt buckle更换第二排左后安全带扣
1. Replace the second row left rear seat belt buckle with a new one, and check whether the fault code and symptoms are eliminated.更换新的第二排左后安全带扣，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 airbag electronic control unit更换安全气囊电控单元
1. Replace the airbag electronic control unit with a new one and check whether the fault code and symptoms are eliminated.更换新的安全气囊电控单元，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 airbag electronic control unit, you need to use a diagnostic tool to recalibrate the airbag electronic control unit.更换安全气囊电控单元后，需用诊断仪对安全气囊电控单元重新标定。