B21259B - TroubleshootingB21259B-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
B21259B	The rear left center sensor is blocked后左中传感器被遮挡	1. The sensor is blocked by foreign objects such as ice and slush, which affects vibration.1.传感器存在冰泥覆盖等异物遮挡，影响振动
		2. The probe core is cracked and the radar probe is scratched2.探芯开裂、雷达探头被剐蹭

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the parking sensor is blocked by foreign objects such as ice and slush.检查中倒车雷达传感器是否存在冰泥覆盖等异物遮挡。 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 Clean up foreign objects.清理异物。

②Check the parking sensor检查中倒车雷达传感器

1. During the inspection, check whether the parking sensor has cracks in the probe core or scratches on the radar probe.检查中倒车雷达传感器是否存在探芯开裂、雷达探头被剐蹭等现象。 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 parking radar sensor.更换中倒车雷达传感器。

③Replace the parking radar sensor更换中倒车雷达传感器

1. Replace the center and parking sensor with a new one, and check whether the fault code and symptoms are eliminated.更换新的中倒车雷达传感器，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。

④Replace the parking sensor controller更换倒车雷达控制器

1. Replace the parking sensor controller with a new one and check whether the fault code and symptoms are eliminated.更换新的倒车雷达控制器，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 parking sensor controller, you need to use a diagnostic tool to recalibrate the parking sensor controller.更换倒车雷达控制器后，需用诊断仪对倒车雷达控制器重新标定。