B3C0C12 - TroubleshootingB3C0C12-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
B3C0C12	Rear defrost and rearview mirror heating relay short circuit fault后除霜、后视镜加热继电器短路故障	1. The circuit loop is short-circuited to the power supply1.电路回路对电源短路

Troubleshooting steps故障诊断步骤

①General inspection一般检查
1. Check whether the rear defrost and rearview mirror heating relay wiring harnesses are damaged or broken.检查后除霜、后视镜加热继电器线束是否存在损坏、断裂等现象。 2. 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 faulty wiring harness or connector.维修或更换故障线束或接插件。
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 the rear defrost and rearview mirror heating relays检查后除霜、后视镜加热继电器
	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 front compartment electrical box and check whether the rear defrost and rearview mirror heating relay ER07 is normal.打开前舱电器盒，检查后除霜、后视镜加热继电器ER07是否正常。 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 Replace the relay with the same specification.更换相同规格的继电器。
④Check the rear defrost and rearview mirror heating relay circuits检查后除霜、后视镜加热继电器线路
1. Check whether the rear defrost and rearview mirror heating relay circuits are short-circuited.检查后除霜、后视镜加热继电器线路是否短路。 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 Repair or replace the rear defrost and rearview mirror heating relay harness.维修或更换后除霜、后视镜加热继电器线束。
⑤Replacing the thermal management integrated module更换热管理集成模块
1. Replace the thermal management integrated module with a new one and check whether the fault code and symptoms are eliminated.更换新的热管理集成模块，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 thermal management integrated module, you need to use a diagnostic instrument to recalibrate the thermal management integrated module.更换热管理集成模块后，需用诊断仪对热管理集成模块重新标定。