Trying to fit a headunit at the mo.

thought it was simply a case of getiing a ISO connector and bang in it goes, but apparently there are 2 or 3 types just for active toyota systems.

my car is a rev3 turbo, so it must have had one of those active things at some stage, altohugh the previous owner has had quite a hefty instal before, so im thinkin he ripped that out, theres no headunit, no speakers, no amps, no subs-nowt.

so my question- will i need an active or passive ISO connector, considering my setup is neither active or passive its just.

.

.erm.

.

.nothing!

the monkies at halfrauds say they dont do Iso Connectors for imports.

what a load of bol locks!

so whixh do i need and how can i tell the differences
cheers

the headunit is a kenwood