yeh ill check that out, i have purchased a parts cd from japan showing every bolt and part on the car and part numbers and so on, some good information but not cheap!! also picked up a 1997 lexus gs300 manual so ill see if any of those wiring diagrams help once it arrives.
main reason at the moment is i have my audio gear out of the '92 cressida and its just sitting there which is rather annoying, and yes doing the wiring for a 10 speaker system will be fun, lol. might see what sound i get if i just replace the amp for the sub, if its seperate or see how much beter it will be by just replacing the sub.
cheers for the help, if you want this parts cd when it comes in let me know and i will see if i can make a copy.