Troubleshooting › Body control system › Diagnosis
U202481-故障诊断 · T00607685

 U202481 - TroubleshootingU202481-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
U202481
RLS invalid frame received收到RLS无效帧
1. There is a problem with the source node1.源节点出问题
2. Whether the LIN line is short-circuited or short-circuited to power or ground.2.LIN线路是否发生短接或短路电源、地的故障情况
3. Is there strong electromagnetic interference around the ECU that affects LIN communication?3.ECU周边是否存在影响LIN通信的强电磁干扰
4. It may be that the BCM itself is faulty4.可能是BCM本身故障
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 your surroundings检查周围环境
1. Check the surrounding environment for the presence of magnetic fields.检查周围环境是否存在磁场。
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 Drive away from the current situation.驶离当前所处环境。
③General 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 LIN communication harness is damaged or broken.检查LIN通讯线束是否存在损坏、断裂等现象。
3. Check whether there is any loose connection or damage to the LIN communication harness connector.检查LIN通讯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 4.去步骤4。
No否 Repair or replace faulty wiring harness or connector.维修或更换故障线束或接插件。
④Replace the rain light sensor更换雨量光线传感器
1. Replace the rain light sensor with a new one and check whether the fault code and symptoms are eliminated.更换新的雨量光线传感器，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 5.去步骤5。
⑤Replacing 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。