Help me behind the dash!!

Ok, as for the mystery wire that is providing 12v it is a blue/white wire and seems to come from one of the connectors under the steering column (there are 2 separate sets of connectors under that column each with about 8 wires I believe connected at a plastic strip connector). It appears to be the same colour as one of the pins on the back of my dash panel.

The problem is that the PO decided (I am assuming in a bid to make disconnecting the dash easier) to splice the wires that lead from the back of the dash feeding the printed circuit board and splice in a 4 wire trailer wire type connector to use as a quick disconnect. Of course now, this is just another potential point of failure and at least extra resistance at the junction. The other problem is he didn't use any of the same colour wires and the wires left behind are too short to access and resplice!

Can any one tell me what each of the wires on the back of the printed circuit board are responsible for? (I believe there are 5 or 6 and connected in the upper right of the board if viewed from behind the dash)

I will attach a couple of pics in hope they help a little but I must admit is hard to get a decent photo while standing on your head under the dash!!