B211B87 - TroubleshootingB211B87-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
B211B87	The sensor on the left rear side of the USS is faulty and the message is lost.USS左后侧传感器存在故障，报文丢失	1. The sensor contact is poor or the sensor is damaged.1.传感器接触不良或者传感器损坏

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 left rear sensor wiring harness检查左后侧传感器线束

1. Check whether the left rear sensor wiring harness is normal.检查左后侧传感器线束是否正常。 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 left rear sensor wiring harness.维修或更换左后侧传感器线束。

③Replace left rear sensor更换左后侧传感器

1. Replace the left rear sensor with a new one and check whether the fault code and symptoms are eliminated.更换新的左后侧传感器，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 4.去步骤4。

④Replacing the autonomous driving domain controller更换自动驾驶域控制器

1. Replace with a new autonomous driving domain controller and check whether the fault code and symptoms are eliminated.更换新的自动驾驶域控制器，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 Look for causes from other symptoms.从其他症状查找原因。   Caution:注意： ♦  After replacing the autonomous driving domain controller, you need to use a diagnostic tool to recalibrate the autonomous driving domain controller.更换自动驾驶域控制器后，需用诊断仪对自动驾驶域控制器重新标定。