no it can be done without but its not so easyas each wire needs to be positively identified, make a wrong connection and serious damage can occur, just get the iso connector (CRV i think)
i was looking on caraudiodirect for these... (but expensive) does anyone have a direct link for a cheap one that works? gonna try and attempt to do this install this sunday
but spent the 14quid on one at halfords instead which works fine... at a premium. You were right, i cut up my fingers/nails getting that damn HU out lol.