blue and black has a 12v supply that originates from fuse 22 initally as a black and green wire and goes to the abs warning indicator in the dash( its the amber one with the car skidding on it)
the black wire begins as a black and yellow wire and is a 12v from the ignition switch on position it changes to a full black wire at junction s-1076, it powers abs pump relays number 2 and also goes to pin 2 of the abs ecu.
the green and brown wire is actually comming from the dash cluster from one side of the brake warning light on its way to the abs diagnostic plug beside the abs module.the other side of the brake warning light is supplied with 12v from a junction with the blue and black wire mentioned above
if you want a wireing diagram, pm me an email and i will send you one