I hooked up everything into my 2007 Honda Civic and for some reason everything works fine just not the sound? Any reason why? I know how to hook it up, i did it in my previous car so i know its not a wiring issue. Any thoughts? Thanks!

i would double check your wiring at the harness.. is you civic factory amplified. from my understanding some 06+ civic are. make sure too hook up the amp turn on lead

WHat ^^^ he said the wire harness you used should have come with a piece of paper explaining where the amp turn on lead is in the vehicle and how to hook it up.