Is this normal? I put the car in accessory mode and from the outside you can clearly hear a very loud buzzing like an electronic sort of thing. You hear nothing when the car starts or just on the first engine start button mode with no brake

 

Mine does it, I think it jas something to do with the led headlights.

 

I just fiddled with mine in Acc mode Sunday, few times. Dead quiet. But I turn off lights, so there is not a valid result.