U012781 - TroubleshootingU012781-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
U012781	Invalid data received from GW_BCM_TPMS_1_B_P (0x325)从GW_BCM_TPMS_1_B_P收到的无效数据(0x325)	1. Bus interference1.总线干扰
		2. The gateway or BCM_TPMS is damaged2.网关或BCM_TPMS损坏
		3. CAN communication abnormality of gateway or BCM_TPMS3.网关或BCM_TPMS的CAN通信异常

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the PCAN communication harness is damaged or broken.检查PCAN通讯线束是否存在损坏、断裂等现象。 2. Check whether the BCAN communication harness is damaged or broken.检查BCAN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 wiring harness connector.检查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 faulty communication harness.维修或更换故障通讯线束。

②Power 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 3.去步骤3。

③Check for electromagnetic interference检查电磁干扰

1. Check for sources of magnetic fields around the vehicle.检查车辆周围是否存在磁场源。 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 Move the vehicle away from its current environment.使车辆驶离当前环境。

④Check BCM fault code检查BCM故障码

1. Use a diagnostic tool to read the BCM fault code and check whether there is a fault in the integrated body control module.使用诊断仪读取BCM故障码，检查集成式车身控制模块是否存在故障。 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 Troubleshoot the integrated body control module according to the fault code.根据故障码排除集成式车身控制模块故障。

⑤Check the gateway controller fault code检查网关控制器故障码

1. Use a diagnostic tool to read the fault code of the gateway controller and check whether there is a fault in the gateway controller.使用诊断仪读取网关控制器故障码，检查网关控制器是否存在故障。 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 Troubleshoot the gateway controller based on the fault code.根据故障码排除网关控制器故障。

⑥Replace 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。