Cigar lighter?
Have you gone through everything electrical in your car? because i know when i wired my aftermarket radio and two after market speakers for the back of my K11 i had 2 white blocks i had to put a few wires from and move them around for my configuration of my sound system, they was a huge white one (i think 12 wires) and another smaller one (possibly 6 maybe 8 wires)
could be one of those, because they are right behind the central column so it could have been unplugged and moved out?
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!