B00702D - TroubleshootingB00702D-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
B00702D	Driver's seat belt pretensioner circuit wiring驾驶员安全带预紧回路搭线	1. Driver’s seat belt pretensioner circuit wiring1.驾驶员安全带预紧回路搭线

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 front seat belt pretensioner connector is firmly and reliably assembled.检查左前安全带预紧器接插件装配是否牢固、可靠。 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 Reconnect the left front seat belt pretensioner connector.重新连接左前安全带预紧器接插件。
②Check the wiring harness from the airbag electronic control unit to the left front seat belt pretensioner检查安全气囊电控单元至左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 left front seat belt pretensioner harness connector BD78.断开安全气囊电控单元线束接插件BD51和左前安全带预紧器线束接插件BD78。 3. Use a digital multimeter to measure the resistance between pins 19 and 20 of the BD51.用数字万用表测量BD51的19号针脚与20号针脚之间的电阻。 Standard resistance value: >1M标准电阻值：＞1M 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 wiring harness from the airbag electronic control unit to the left front seat belt pretensioner.维修或更换安全气囊电控单元至左前安全带预紧器之间的线束。
③Replace left front seat belt pretensioner更换左前安全带预紧器
1. Replace the left front seat belt pretensioner with a new one and check whether the fault code and symptoms are eliminated.更换新的左前安全带预紧器，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。