Since I was doing this for myself I thought I'd share it here.
This is an image from the female connectors on the back of the stereo (japanese import).
(http://i100.photobucket.com/albums/m24/scottish_turbo/toyotastereodiagram.gif)
Connector B................................................................ISO colour
1 mint green...................speaker FR+.......................... grey
2 pink...........................speaker FL+...........................white
3 grey...........................accessory / ignition..................red
4 blue/green stripe............battery / memory....................yellow
5 blue...........................speaker FR-........................... grey/black stripe
6 purple.........................speaker FL-...........................white/black stripe
7 brown.........................ground.................................black
8 black..........................aerial...................................blue
9
10 green.........................illumination............................orange
Good idea.
Cheers,
B