Siren at engine start

[Blackgray]

There's a siren noise that goes off every time I start the ignition. I imagine/hoping this is "normal." Does anyone know what the purpose of this is?

 

[rovie]

There's a siren noise that goes off every time I start the ignition. I imagine/hoping this is "normal." Does anyone know what the purpose of this is?

I don't know that. Can you make an audio recording of it?

 

[Walter]

How loud is it? I sometimes hear a squeaky sound from the engine bay, especially during drive-throughs when I roll down the window.

 

[Eric]

There's a siren noise that goes off every time I start the ignition. I imagine/hoping this is "normal." Does anyone know what the purpose of this is?

Don't get that sound, I'm diesel though. We're does it appear to come from? Fuel pump, relay opening, infomat energising?