I just picked up a 1994 Civic EX. Its gou a nice stereo in it, but the highs keep cutting in and out, sometimes all u here is the bass. What could the problem be? Where can I ge a wiring diagram for the civic and poneer deck? The subs are on the amp, but the rest of the speakers are running off the headunit.

 

Do you mean the sub keeps working but the rest of the speakers cut out, [the ones running off the Pioneer HU] 94