B104001 - TroubleshootingB104001-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
B104001	The resistance from ECU terminal to power supply is too largeECU端到电源的阻值过大	1. The equivalent resistance of the power supply in series is too high1.电源串联等效电阻过高

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 airbag electronic control unit wiring harness is damaged or broken.检查安全气囊电控单元线束是否存在损坏、断裂等现象。 3. Check the airbag electronic control unit harness connector for loose connection or damage.检查安全气囊电控单元线束接插件是否存在虚接、损坏等现象。 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 airbag electronic control unit wiring harness or connector.维修或更换安全气囊电控单元线束或接插件。
②Check the airbag electronic control unit IG power circuit检查安全气囊电控单元IG电源线路
	1. Power status 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.断开安全气囊电控单元线束接插件BD51。 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 of the BD51 and ground.用数字万用表测量BD51的1号针脚与接地之间的电压。 Standard voltage value: about 14V标准电压值：约14V 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 airbag electronic control unit IG power harness.维修或更换安全气囊电控单元IG电源线束。
③Replace 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。