Troubleshooting › Air bag system › Diagnosis
B00722D-故障诊断 · T00607323

 B00722D - TroubleshootingB00722D-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
B00722D
Passenger seat belt pretensioner circuit wiring乘员安全带预紧回路搭线
1. Passenger seat belt pretensioner circuit wiring1.乘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 right front seat belt pretensioner connector is firmly and reliably assembled.检查右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 right front seat belt pretensioner connector.重新连接右前安全带预紧器接插件。
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
Graphic
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. Use a digital multimeter to measure the resistance between pins 17 and 18 of the BD51.用数字万用表测量BD51的17号针脚与18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 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。