Stereo wiring diagram for ur civic aint gonna help you out man. If your system was working BEFORE you installed the spkrs and amp, it's one of those. First of all, do you have an aftermarket HU? If so, you might wanna check the preouts to see if they're functional. Now, is your sub and spkrs new? btw..is this a sub or spkrs for ur car? Is ur amp a 2 or 4 channel amp? I'll help u out after u post updates