U020887 - TroubleshootingU020887-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
U020887	Lost communication with seat module与座椅模块丢失通讯	1. The communication harness is disconnected or the module is lost1.通讯线束断开或模块丢失

Troubleshooting steps故障诊断步骤

①Power-on inspection (taking the left front door control module fault report as an example)上电检查(以报左前门控制模块故障为例)
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。
②General 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 whether the BCAN communication harness is damaged or broken.检查BCAN通讯线束是否存在损坏、断裂等现象。 3. Check the BCAN communication harness connector for loose connections or damage.检查BCAN通讯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 3.去步骤3。 No否 Repair or replace the BCAN communication harness or connector.维修或更换BCAN通讯线束或接插件。
③Check the communication harness between the left front door control module and the seat controller检查左前门控制模块与座椅控制器之间的通讯线束
	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 left front door control module 2 harness connector FL17 and seat controller 3 harness connector RS05.断开左前门控制模块2线束接插件FL17和座椅控制器3线束接插件RS05。 3. Use a multimeter to measure the resistance between pins 9/10 of FL17 and pins 23/24 of RS05.使用万用表测量FL17的9/10号针脚和RS05的23/24号针脚之间的电阻。 Standard resistance value: <1标准电阻值：＜1Ω 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 or replace the faulty wiring harness.维修或更换故障线束。
④Check seat controls检查座椅控制器
1. Power status "OFF".电源状态“OFF”。 2. Connect the diagnostic tool.连接诊断仪。 3. Power status "ON".电源状态“ON”。 4. Use a diagnostic tool to check the seat controls.使用诊断仪检查座椅控制器。 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 Inspect seat controls.检修座椅控制器。
⑤Replace left front door control module更换左前门控制模块
1. Replace the left front door control module with a new one and check whether the fault code and symptoms are eliminated.更换新的左前门控制模块，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 left front door control module, you need to use a diagnostic tool to recalibrate the left front door control module.更换左前门控制模块后，需用诊断仪对左前门控制模块重新标定。