Could also be for the toll booths in Japan...mine has Ariel stickers all across the top of my windscreen. It was linked to a device in the footwell, kind of like a mini card reader. They would load it with a prepaid card, and they could then drive the car towards a toll and the barriers would open.
. Pretty nifty. Search for a box of some sort in the footwells, you may find something linked to it. Or follow the cables.