Pixhawk4 buzzer flows mV not 5V

Pixhawk
1

I am trying to use a separate RTK GPS rather than the GPS provided by Pixhawk4.
Pixhawk4 uses the drone’s buzzer and switch for the GPS terminal. I connected the GPS pins, the switch pin, and the buzzer pin as shown in the figure below, and the GPS was connected well.

캡처.PNG
캡처.PNG2223×1222 392 KB

But the buzzer and switch don’t work. The pinout of Pixhawk4 says 5V flows to the + pin of the buzzer, but it was confirmed that 0.1~0.2V was flowing when actually measured.
I was expecting 5V to flow just by connecting it, but I’m disappointed it doesn’t. Why doesn’t 5V flow? What additional work do I need to do?

2

How do you know the switch does not work?
The buzzer pin would not have +5 unless the buzzer is on

3

@jimdgit The LED on the switch does not work, and the arming does not release when pressed.
I know it’s not 5V when the buzzer doesn’t sound.
The problem is that 5V does not come out when the buzzer should sounds. When I checked with an oscilloscope at the timing when the buzzer should sound, 0.1~0.2mV was measured.