viper 5900 siren has stopped working

So I just finished installing my Viper 5900 into my integra and low and behold the siren has just stopped working all toghether. It did work fine, then all of a sudden nothing, no chirps, nothing when alarm is triggered.  I was goofing around with the remote  so maybe I screwed something up? And no I'm not in valet mode (led is not solid) ... any suggestions? Thanks

Back to basics, check the brown siren wire at the alarm CPU,  it should go 12v+ when you arm the vehicle or trigger the alarm. Check the continuity from this to the siren's red wire and make sure the sirens's black wire has a good ground.  Check the siren itself by keeping the black lead grounded and flash the red to battery.  If none of this shows up the unit's siren output has blown.