Troubleshooting › Instrument cluster/driver information system › Diagnosis
B2A0016-故障诊断 · T00607102

 B2A0016 - TroubleshootingB2A0016-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
B2A0016
There is a fault in the power supply and the circuit voltage is below the threshold电源存在故障，电路电压低于门槛值
1.DCDC is damaged1.DCDC损坏
2. The 12V battery is low2.蓄电池电量低
3. Power supply harness circuit failure3.供电线束回路故障
Troubleshooting steps故障诊断步骤
①Power on check上电检查
1. Repower the vehicle, use the diagnostic tool to read and clear the fault codes, and check whether the fault codes and symptoms are eliminated.车辆重新上电，使用诊断仪读取并清除故障码，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 2.去步骤2。
②Check 12V battery voltage检查蓄电池电压
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. Use a digital multimeter to measure the voltage between the positive and negative terminals of the 12V battery.用数字万用表测量蓄电池正负极之间的电压。
Standard voltage value: about 12.5V标准电压值：约12.5V
Are the test results normal?检查结果是否正常？
Yes是 Go to step 4.去步骤4。
No否 Go to step 3.去步骤3。
③Check DCDC output voltage检查DCDC输出电压
1. The vehicle is powered on.车辆上电。
2. Use a digital multimeter to measure the voltage between the positive and negative terminals of the 12V battery.用数字万用表测量蓄电池正负极之间的电压。
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 Charge the 12V battery and replace it if necessary.对蓄电池进行充电，必要时更换蓄电池。
No否 Inspect DCDC and its lines.检修DCDC及其线路。
④Check the combination switch and clock spring assembly and power circuit检查组合开关与时钟弹簧总成常电源线路
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 combination switch and clock spring assembly harness connector IP31/IP33.断开组合开关与时钟弹簧总成线束接插件IP31/IP33。
3. Connect the negative terminal of the 12V battery.连接蓄电池负极。
4. Use a digital multimeter to measure the voltage between pin 1 of the IP31 and ground.用数字万用表测量IP31的1号针脚与接地之间的电压。
Standard voltage value: about 12.5V标准电压值：约12.5V
Graphic
e. Use a digital multimeter to measure the voltage between pin 1 of IP33 and ground.e.用数字万用表测量IP33的1号针脚与接地之间的电压。
Standard voltage value: about 12.5V标准电压值：约12.5V
Are the test results normal?检查结果是否正常？
Yes是 Go to step 5.去步骤5。
No否 Repair or replace the combination switch and clock spring assembly and power wiring harness.维修或更换组合开关与时钟弹簧总成常电源线束。
⑤Check the combined switch and clock spring assembly IG power circuit检查组合开关与时钟弹簧总成IG电源线路
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 combination switch and clock spring assembly harness connector IP31.断开组合开关与时钟弹簧总成线束接插件IP31。
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 6 of the IP31 and ground.用数字万用表测量IP31的6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 6.去步骤6。
No否 Repair or replace the combined switch and clock spring assembly IG power harness.维修或更换组合开关与时钟弹簧总成IG电源线束。
⑥Replace the combination switch and clock spring assembly更换组合开关与时钟弹簧总成
1. Replace the combined switch and clock spring assembly with a new one, and check whether the fault code and symptoms are eliminated.更换新的组合开关与时钟弹簧总成，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 combination switch and clock spring assembly, you need to use a diagnostic instrument to recalibrate the combination switch and clock spring assembly.更换组合开关与时钟弹簧总成后，需用诊断仪对组合开关与时钟弹簧总成重新标定。