Subwoofer Output Not Working...

I've had this deck for about a year, everything has worked well. I have subs hooked up to the RCA sub output connectors to an amp and 2 10 inch subwoofers.

I removed my subs to put somthing in my car, put the subs back and now I hardly get anything out of the subs. I took the subs and amp into a shop and verified they are working perfectly. I even hooked my ipod up to the amp and it worked fine. The amp powers up and everything, and only a little bass comes out.

The shop said it is probably the deck that is the issue, has anyone ever had this issue? Everything works find except for that! It sux!

Thanks for any help!
I recently changed the head units in my pathfinder and the subs were working before. I have two Kicker 12'' CVR and a performance teknique 1200 watt 2 channel amp. I had a kenwood head unit but then purchased the Eclipse head unit. I switched RCA cables and my amp isnt blown because i checked with another amp. I can hear the subs when i switch the amp from LPF to HPF, but the subs wont play. there is a amp turn on wire and a amplifier ground wire,...i dont have them hooked anymore, but could that be why? and now i dont have them connected and its still the same results.