Are you sure that's a button and not a warning lamp? Door ajar, rear seat belts? Passenger air bag, Something like that? The owners manual is the place to look. There's usually a page describing aspects of the dash.
The hdmi and USB you posted are the ends of extension cords.
If your new head has USB and hdmi they'll plug right in or can be modified to plug in.
I'll GUESS an ac voltage power outlet goes where the USB hdmi is now. (or you can easily add one)
I'll GUESS the unplugged items are the steering wheel radio controls if you don't have those on your vehicle.
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