Dipont

Hey all I´ve been fixing my overall sound system in the car but I need some help now. Trying to find the remote cable behind the stereo, what I often have seen from similiar forums says that a blue should be it, It´s a ISO something, sitting in a Octavia mk1 if that does makes more sense. It´s the cable that starts the amplifier when you are switching on the ignition, apperantly it can be fixed by attaching a so called remote cable. I can show also some pictures tomorrow for a better understanding. Maybe there is another way or even better one but now I´m kinda stuck, only the last part left and then I´ve got a kick-ass "BRRRRBRRRBRRR" sound in it