Just went through the process of installing a Pioneer Head Unit with integrated bluetooth etc. Original intent was to get the appropriate adapter harness. However on closes inspection it was apparent one of the previous owners butchered the original, ended up just cleaning this up and thought it might be of assistance to someone else to know the wire colours and destinations.
Black - Earth

Pink - remote control for telescopic aerial
Red - permanent power feed (based on what I recall now, maybe just double check)
Blue - ignition on power feed based on what I recall now, maybe just double check)
White with red line - + right Front
Black with red line - - right Front
White with blue line - + left Front
Black with blue line - - left Front
Yellow with red line - + right Rear
Gray with red line - - right Rear
Yellow with blue line - + left Rear
Gray with blue line - - left Rear
Hope this helps.
Unfortunately as with most after market head units it looks totally out of place, but it works like a charm, and at R1400 it was less than most of the decent stand alone hands free kits.
