The 12V battery cannot be charged蓄电池不能充电

①Check battery pack power检查电池组箱电量
1. Check whether the power of the battery pack is normal.检查电池组箱电量是否正常。 Are the test results normal?检查结果是否正常？ Yes → Go to step 2.是>>去步骤2。 No → Charge the vehicle.否>>对车辆进行充电。
②Check fuse检查保险丝
	1. Check whether the DCDC fuse in the battery-positive fuse box is normal.检查正极电器盒中DCDC保险丝是否正常。 DCDC：200A Are the test results normal?检查结果是否正常？ Yes → Go to step 3.是>>去步骤3。 No → Replace the fuse with the same specification.否>>更换相同规格保险丝。
③Check the wiring harness connector检查线束接插件
1. Check whether the integrated electric drive assembly wiring harness is damaged or broken.检查集成电力驱动总成线束是否存在损坏、断裂等现象。 2. Check the integrated electric drive assembly wiring harness connector for loose connection or damage.检查集成电力驱动总成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 → Go to step 4.是>>去步骤4。 No → Repair or replace the faulty wiring harness or connector.否>>维修或更换故障线束或接插件。
④Check CAN communication line检查CAN通讯线路
1. Check whether the CAN communication line of the integrated electric drive assembly is normal.检查集成电力驱动总成CAN通讯线路是否正常。 Are the test results normal?检查结果是否正常？ Yes → Go to step 5.是>>去步骤5。 No → Check the CAN communication line.否>>检修CAN通讯线路。
⑤Check the integrated electric drive assembly fault code检查集成电力驱动总成故障码
1. Use a diagnostic tool to read the fault code of the integrated electric drive assembly and check whether there is a fault in the integrated electric drive assembly.使用诊断仪读取集成电力驱动总成故障码，检查集成电力驱动总成是否存在故障。 Are the test results normal?检查结果是否正常？ Yes → Go to step 6.是>>去步骤6。 No → Troubleshoot the integrated electric drive assembly fault according to the fault code.否>>根据故障码排除集成电力驱动总成故障。
⑥Check the integrated electric drive assembly DCDC output power supply voltage检查集成电力驱动总成DCDC输出电源电压
1. Power status "ON".电源状态“ON”。 2. Use a digital multimeter to measure the voltage between the positive and negative terminals of the front 12V battery.用数字万用表测量前舱蓄电池正负极之间的电压。 Standard voltage value: about 14V标准电压值：约14V Are the test results normal?检查结果是否正常？ Yes → Go to step 8.是>>去步骤8。 No → Go to step 7.否>>去步骤7。
⑦Check the integrated electric drive assembly DCDC output power supply line voltage drop检查集成电力驱动总成DCDC输出电源线路电压降
1. Power status "ON".电源状态“ON”。 2. Check whether the voltage drop of the DCDC output power supply line of the integrated electric drive assembly is normal.检查集成电力驱动总成DCDC输出电源线路电压降是否正常。 Are the test results normal?检查结果是否正常？ Yes → Go to step 8.是>>去步骤8。 No → Repair or replace the integrated electric drive assembly DCDC output power supply harness.否>>维修或更换集成电力驱动总成DCDC输出电源线束。
⑧Check the DCDC output grounding circuit of the integrated electric drive assembly检查集成电力驱动总成DCDC输出接地线路
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 DCDC output grounding circuit of the integrated electric drive assembly is normal.检查集成电力驱动总成DCDC输出接地线路是否正常。 Are the test results normal?检查结果是否正常？ Yes → Go to step 9.是>>去步骤9。 No → Repair or replace the integrated electric drive assembly DCDC output grounding harness.否>>维修或更换集成电力驱动总成DCDC输出接地线束。
⑨Replace 12V battery更换蓄电池
1. Replace the 12V battery and check whether the fault is eliminated.更换蓄电池，检查故障是否排除。 Are the test results normal?检查结果是否正常？ Yes → Fault resolved.是>>故障排除。 No → Find the cause from other fault symptoms.否>>从其他故障现象查找原因。