Troubleshooting › Body control system › Diagnosis
B25A012-故障诊断 · T00607612

 B25A012 - TroubleshootingB25A012-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
B25A012
ACC output failureACC输出故障
1. Pin connection problem1.管脚连接问题
Troubleshooting steps故障诊断步骤
①General inspection一般检查
1. Power status "OFF".电源状态“OFF”。
2. Check the integrated body control module wiring harness for damage, breakage, etc.检查集成式车身控制模块线束是否存在损坏、断裂等现象。
3. Check whether the integrated body control module wiring harness connector is damaged or has a loose connection.检查集成式车身控制模块线束接插件是否存在损坏、虚接等现象。
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 faulty wiring harness or connector.维修或更换故障线束或接插件。
②Check fuse检查保险丝
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. Open the electrical box on the instrument panel and check whether fuse IF02 is blown.打开仪表板电器盒，检查保险丝IF02是否熔断。
IF02：7.5A
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 Replace the fuse with the same specification.更换相同规格的保险丝。
③Replace ACC relay更换ACC继电器
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. Replace ACC relay IR01 and check whether the fault code and symptoms are eliminated.更换ACC继电器IR01，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。
④Check ACC relay output voltage检查ACC继电器输出电压
Graphic
1. The entire vehicle is powered on.整车上电。
2. Use a digital multimeter to measure the voltage between pin 20 of the integrated body control module harness connector BD56 and ground.使用数字万用表测量集成式车身控制模块线束接插件BD56的20号针脚与接地之间的电压。
Standard voltage value: 14V标准电压值：14V
Are the test results normal?检查结果是否正常？
Yes是 Go to step 7.去步骤7。
No否 Go to step 5.去步骤5。
⑤Check the ACC relay control terminal wiring harness检查ACC继电器控制端线束
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 integrated body control module harness connector BD56.断开集成式车身控制模块线束接插件BD56。
3. Use a digital multimeter to measure the resistance between pin 25 of the BD56 and ground.使用数字万用表测量BD56的25号针脚与接地之间的电阻。
Standard resistance value: <1标准电阻值：＜1 Ω
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 Inspect the ACC relay control terminal wiring harness.检修ACC继电器控制端线束。
⑥Check the ACC power output harness检查ACC电源输出线束
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. Unplug the fuse IF02 in the instrument panel electrical box and disconnect the integrated body control module harness connector BD56.拔下仪表板电器盒保险丝IF02，断开集成式车身控制模块线束接插件BD56。
3. Use a digital multimeter to measure the resistance between the output of the fuse IF02 socket and pin 20 of the BD56.使用数字万用表测量保险丝IF02插座输出端与BD56的20号针脚之间的电阻。
Standard resistance value: <1标准电阻值：＜1 Ω
Are the test results normal?检查结果是否正常？
Yes是 Go to step 7.去步骤7。
No否 Repair or replace the faulty wiring harness.维修或更换故障线束。
⑦Replacing the integrated body control module更换集成式车身控制模块
1. Replace with a new integrated body control module and check whether the fault code and symptoms are eliminated.更换新的集成式车身控制模块，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 integrated body control module, you need to use a diagnostic tool to recalibrate the integrated body control module.更换集成式车身控制模块后，需用诊断仪对集成式车身控制模块重新标定。