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故障现象一辆2013年产比亚迪速锐车。累计行驶里程约为1万km,左侧前照灯高度无法调节。故障诊断该车具有前照灯高度调节功能,驾驶人只要拨动前照灯调节开关(图1),即可在一定范围内(前照灯调节开关上共有11个挡位)改变前照灯的高度。试车发现,拨动前照灯调节开关,右侧前照灯高度可正常变化,而左侧前照灯高度无变化。分析该车前照灯高度调节控制电路(图2),并结合右侧前照灯高度可正常调节而左侧前照灯高度无法调节的故障现象,初步推断可能的故障原因有:左侧前照灯调节电动机损坏;左侧前照灯调节电动机外围线路(电源、搭铁或控制信号线路)故障。
Failure phenomenon A 2013 BYD Speed ?? Rui car. The cumulative mileage is about 10000 km, the left headlamp height can not be adjusted. Troubleshooting The car has a headlamp height adjustment function, the driver simply dial the headlamp adjustment switch (Figure 1), you can within a certain range (headlight adjustment switch on a total of 11 gear) to change the headlamps the height of. The test found that toggle the front light adjustment switch, the right headlamp height can be normal changes, while the left headlamp height no change. Analysis of the car headlight height adjustment control circuit (Figure 2), combined with the right headlamp height can be adjusted and the left headlamp height can not be adjusted to the phenomenon of failure, the initial reason may be suspected of failure are: left front Lighting adjustment motor damage; left headlamps adjust the motor peripheral circuits (power, ground or control signal lines) fault.