B007212 - TroubleshootingB007212-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
B007212	Passenger seat belt pretension circuit short circuit to power supply乘员安全带预紧回路对电源短路	1. The passenger seat belt pretension circuit is short-circuited to the power supply.1.乘员安全带预紧回路对电源短路

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 right front seat belt pretensioner harness for damage, breakage, etc.检查右前安全带预紧器线束是否存在损坏、断裂等现象。 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 right front seat belt pretensioner harness.维修或更换右前安全带预紧器线束。
②Check the wiring harness from the airbag electronic control unit to the right front seat belt pretensioner检查安全气囊电控单元至右前安全带预紧器之间的线束
	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 airbag electronic control unit harness connector BD51 and the right front seat belt pretensioner harness connector BD77.断开安全气囊电控单元线束接插件BD51和右前安全带预紧器线束接插件BD77。 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 pins 17/18 of the BD51 and ground.用数字万用表测量BD51的17/18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 wiring harness from the airbag electronic control unit to the right front seat belt pretensioner.维修或更换安全气囊电控单元至右前安全带预紧器之间的线束。
③Replace right front seat belt pretensioner更换右前安全带预紧器
1. Replace the right front seat belt pretensioner with a new one and check whether the fault code and symptoms are eliminated.更换新的右前安全带预紧器，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 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。