"Sireny" sound when engine not on?

[sharpcode]

In my 2025, I'm getting a weird ascending tone from the car audio when I'm watching things with the accessory mode on and the engine off. Does anyone know what this is, or if there's a way to "fix" it?

It sounds somewhat like a siren, starting from a low tone and going higher. Are others experiencing this too? It happens in multiple locations, so I don't suspect location-based interference.

 

[Combatvet]

Could it be the blend doors closing? Mine makes a screeching noise after I've turned the ignition off, it happens over a period of a few minutes, and I can hear actuators closing the internal vents.

 

[sharpcode]

It doesn't sound mechanical, and it does seem to be coming through the speakers, so I don't think it would be that. I may have to record and post it. Describing a sound isn't great.