Chocolate Apocalypse

Hey all, when I lock my doors either with the fob or door switch, close the door (when already closed too) the alarm goes off. As soon as I hit the panic button it stops and is fine. I found that the aftermarket deck is wired incorrectly, when I turn on the headlights via the switch, the deck powers up. Also, I checked the BDM for DTCs and the only current one was a 24 (as well as a history 34) which translates to: Fasten Seatbelt Indicator Lamp (Circuit Shorted to Ground or Battery +). Has anyone run into a situation like this before? I'm assuming that 24 means I have a shorted wire somewhere? Any help would be greatly appreciated. Thanks.