I have a AVHp4200 dvd and use to have my HTC touch pro hooked up to it with av cables (tvout) to view the display on the screen and play audio/video.

 

I went ahead and purchased a av cable (amazon prime) for my iphone 4s and first plugged it into my tv to test it out and it worked just fine.

I than replaced the wires on my AVH stereo and made sure all the plugs were in right and when I plugged in my iphone 4s to the connector the display shows but there is no audio at all.. playing pandora, games, youtube, music ect... I messed around with the settings in both stereo and phone but no luck.

 

the only thing I found that made the audio play is if I received a phone call which is weird however during conversation I can't hear over the speakers only over the phone which sucks.

 

Any clue on what is wrong?