One of the white blocks is for the front two speakers and two power leads, headlight notifier, etc. The other is for the two back speakers where fitted. So if there's no back speakers it could be the wiring is there if you ever wanted to install them, or if they're installed could check they're working. Although that doesn't look like the right connector/style of wire from what I remember of installing a new head unit in my K11. But good guess!