B188109 - TroubleshootingB188109-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
B188109	LCD instrument connection failure液晶仪表连接故障	1. The instrument screen is not connected1.仪表屏未连接

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 whether the instrument panel wiring harness is damaged or broken.检查组合仪表屏线束是否存在损坏、断裂等现象。 3. Check whether there is a loose connection or damage to the combined instrument panel wiring harness connector.检查组合仪表屏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。

②Check the connection harness between the instrument cluster screen and the infotainment head unit检查组合仪表屏与车载智能多媒体主机之间的连接线束

1. Check whether the connection harness between the instrument cluster screen and the infotainment head unit is normal.检查组合仪表屏与车载智能多媒体主机之间的连接线束是否正常。 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 faulty wiring harness.维修或更换故障线束。

③Replace the instrument cluster screen更换组合仪表屏

1. Replace the instrument cluster screen with a new one and check whether the fault code and symptoms are eliminated.更换新的组合仪表屏，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。

④Replacement of infotainment head unit更换车载智能多媒体主机

1. Replace with a new infotainment head unit and check whether the fault code and symptoms are eliminated.更换新的车载智能多媒体主机，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 infotainment head unit, it is necessary to use a diagnostic instrument to recalibrate the infotainment head unit.更换车载智能多媒体主机后，需用诊断仪对车载智能多媒体主机重新标定。