B1C8009 - TroubleshootingB1C8009-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
B1C8009	Compressor high-voltage interlock (HVIL) failure压缩机高压互锁故障	1. The compressor high-voltage wiring harness and connector are disconnected or have poor contact.1.压缩机高压线束及接插件断开或接触不良

Troubleshooting steps故障诊断步骤

①General inspection一般检查
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 the thermal management integrated module and the air conditioning compressor low-voltage wiring harness for damage, breakage, etc.检查热管理集成模块和空调压缩机低压线束是否存在损坏、断裂等现象。 3. Check the thermal management integrated module and the air conditioning compressor low-voltage wiring harness connector for loose connections or damage.检查热管理集成模块和空调压缩机低压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 high voltage electrical components检查高压电器件
1. Check whether the high-voltage electrical components are correctly connected and whether the interlock pins at the corresponding high-voltage harness end are connected.检查高压电器件是否正确连接及相应高压线束端互锁针脚是否导通。 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 Repair faulty high-voltage electrical components.检修故障高压电器件。
④Check the high-voltage interlock (HVIL) signal harness from the thermal management integrated module to the air conditioning compressor assembly检查热管理集成模块至空调压缩机总成之间的高压互锁信号线束
	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. Disconnect the thermal management integrated module harness connector FB44 and the air conditioning compressor assembly harness connector FB64.断开热管理集成模块线束接插件FB44和空调压缩机总成线束接插件FB64。 3. Use a digital multimeter to measure the resistance between pins 29/41 of FB44 and pins 6/5 of FB64.用数字万用表测量FB44的29/41号针脚与FB64的6/5号针脚之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω 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 high-voltage interlock (HVIL) signal harness from the thermal management integrated module to the air conditioning compressor assembly.维修或更换热管理集成模块至空调压缩机总成之间的高压互锁信号线束。
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。