首先检查保险丝看是否熔断，然后拔下喇叭插头，用万用表测量在按喇叭开关时此处是否有电。

First check the fuse to see whether the fuse, and then pull off the horn plug, using a meter measurement in the horn switch when there is electricity.

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本电参数测试仪通过AT 89 C 51单片机作为核心的控制元件，由模拟开关hcf 4051构成自动量程数字万用表。

Abstrct: the electrical parameters Tester through AT89C51 SCM as a core element of control by the analog switch HCF4051 constitute a range digital multimeter.

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