OK, I have used this:
http://www.installdr.com/Harnesses/Toyota-Wiring.pdf

and figured out that the wiring in my car goes as follows:

Purple

- Left Front

-
Pink

- Left front

+
Grey

(or silver not sure)

-

+12v Ignition
Brown

Black

- Ground
Black w/ red stripe
Blue w/ yellow stripe

-

+12v Battery
Dark Green
Red

- Right rear

+
Yellow

- Left rear

-
White

- Right rear

-
Blue

- Right front

-
Minty green

- Right front

+
Pink w/ blue stripe

So that leaves me with:

Black w/red stripe

- I believe this to be one of the antenna cables, based on the wiring colours for the active system
Dark Green

- I am guessing at this being a speaker, but could be wrong
Pink w/ Blue Stripe

- This is for the amp on the active system.

Not sure what it does on the passive?!
Brown

- No idea on this either?

Can anybody shed any light?