Humming / buzzing noise with key turned

Maintenance/Repairs
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1

Hey there so my mom’s car has been having a bunch of problems and when I was just looking over her car I noticed that with the key turned to on it makes a buzzing or humming noise I’ll link a video hope you can hear it. I was wondering what this could be. She replaced the battery about 1 or 2 years ago with a battery from AAA that costed $150 and is supposed to last 7 years. The humming will get higher pitch when you turn the key off for around 20 seconds than stops. https://youtu.be/579nt8bP974

Also my mom’s car will make the chirping noise when you turn the key on and re lights go o and off but it will sometimes make that chirping noise 10 or 20 times in a row like in the middle of each other it’s really odd. I’ll see if I can record that too when it does it again. So it must have something electrical wrong but I dunno what to look thank you for your help in advanced.

2

This battery that costed (SIC) 150.00, does it start the vehicle?

3

Yeah it starts fine and right away.

4

Are you sure your headlight are turned off? This buzzer can warn you in case you forgot to turn them off.

5

Yes they are off also.

6

It would be great if you had a stetoscope to pinpoint where the noise is coming from.I suggest you drive to a trusted mechanic and have him listen to it.He will probably not even charge you for his diagnostic.

7

Could be the fuel pump. Those’ll run whenever you turn the key, even if you don’t turn it far enough to start the engine. And they hum/buzz.

Or it could be self-testing the EVAP system.

My guess is that rascal is right. He’ll probably recognize the noise immediately and not even other to drive it into the shop’s bay.

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