B2B7514 - TroubleshootingB2B7514-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
B2B7514	Front left seat ventilation PWM output short circuit to ground or open circuit前左座椅通风PWM输出短路到地或开路	1. Abnormal ventilation fan1.通风风扇异常
		2. Abnormal ventilation fan wiring harness2.通风风扇线束异常

Troubleshooting steps故障诊断步骤

①Power 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 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 the driver's seat cushion fan wiring harness for damage, breakage, etc.检查主驾座垫风机线束是否存在损坏、断裂等现象。 3. Check the driver's seat cushion fan harness connector for loose connection or damage.检查主驾座垫风机线束接插件是否存在虚接、损坏等现象。 4. Check the driver's backrest fan wiring harness for damage, breakage, etc.检查主驾靠背风机线束是否存在损坏、断裂等现象。 5. Check whether there is any loose connection or damage to the driver's backrest fan harness connector.检查主驾靠背风机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 faulty wiring harness or connector.维修或更换故障线束或接插件。

③Check the driver's seat fan PWM signal harness检查主驾座椅风机PWM信号线束

1. Check whether the driver's seat fan PWM signal harness is short-circuited to ground or open circuit.检查主驾座椅风机PWM信号线束是否短路到地或开路。 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。

④Replace the driver's seat fan更换主驾座椅风机

1. Replace the driver's seat fan with a new one and check whether the fault code and symptoms are eliminated.更换新的主驾座椅风机，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 Go to step 5.去步骤5。

⑤Replace seat controller更换座椅控制器

1. Replace the seat controller with a new one and check whether the fault code and symptoms are eliminated.更换新的座椅控制器，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： ♦  Any repairs on the passenger seat with a seat controller (replacement of the entire seat and software flash of the seat controller are included), after the repair, it is necessary to use a diagnostic tool to clear the position information of the seat controller (when the diagnostic tool is operated, the vehicle remains in the Ready state), and inform the user that the position information has been cleared and the seat position needs to be re-memorized. Otherwise, the position information will be incorrect due to maintenance, resulting in the failure of related functions of the passenger seat.所有带座椅控制器的副驾驶座椅的任何维修（座椅整椅的更换、座椅控制器的软件刷新都包含在内），在维修后，都需要使用诊断仪对座椅控制器进行位置信息清除操作（诊断仪操作时，整车保持为Ready状态），并告知用户位置信息已清除，需要重新记忆座椅位置，否则会因为维修导致位置信息错误，导致副驾驶座椅相关功能失效。