Did you hook up the power wire for your amp? You more than likely have an amp if you have factory tweeters in your car. If that amp is not powered I don't think you will get sound. Excuse my ignorance but if there is an amp isn't that already powered since the factory stereo gives sound fine. When ...

I have a 04 Pontiac Vibe AWD. I installed a Pioneer DEH-150MP. It fires up and functions but there is no sound coming out of speakers. When I put the old/factory unit back I get sound. So the speakers are fine. Here are my questions: - What might be causing the no-sound problem here? - Is it likely ...