I just hapeb to have the toyota end of a MK1 stereo loom by my side with an Halfords ISO lead as well, so assuming they didn't change the wiring from MK1 to MK2 here goes;
Toyota:----------------------------------------Halfords ISO:
Blue with Yellow Trace
& Silver Dots-------Yellow
(12v memory)
Green with Silver Dots-----------------------Orange
(Illumination)
Grey with Silver Dots------------------------Red
(+12V ignition)
Black with silver Dots------------------------Blue
(Remote Antenna)
Brown with Silver Dots-----------------------Black
(Earth)
Purple with Silver Dots-----------------------White with Black Trace
(FL neg)
Pink with Silver Dots-------------------------White
(FL pos)
Blue with Silver Dots-------------------------Grey with Black Trace
(FR neg)
Green with Silver Dots-----------------------Grey
(FR neg)
I haven't got the toyota loom for the rear speakers, but that gives you a start.
Kelvin