B007312 - TroubleshootingB007312-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
B007312	The rear driver's side seat belt pretensioner circuit is short-circuited to the power supply后排驾驶员侧安全带预紧回路对电源短路	1. The rear driver's side seat belt pretension circuit is short-circuited to the power supply.1.后排驾驶员侧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 left rear seat belt pretensioner harness for damage, breakage, etc.检查左后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 left rear seat belt pretensioner harness.维修或更换左后安全带预紧器线束。
②Check the wiring harness from the airbag electronic control unit to the left rear seat belt pretensioner检查安全气囊电控单元至左后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 BD52 and the left rear seat belt pretensioner harness connector BD94.断开安全气囊电控单元线束接插件BD52和左后安全带预紧器线束接插件BD94。 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 15/16 of the BD52 and ground.用数字万用表测量BD52的15/16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 left rear seat belt pretensioner.维修或更换安全气囊电控单元至左后安全带预紧器之间的线束。
③Replace left rear seat belt pretensioner更换左后安全带预紧器
1. Replace the left rear seat belt pretensioner with a new one and check whether the fault code and symptoms are eliminated.更换新的左后安全带预紧器，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。