Car Horn Keeps Going Off & Engine not cranking
 

Hey,

So recently my car horn went off after I put this plug back into this slot (which I believe is to be the factory alarm) and now my car wont start but accessories and radio turn on. My battery is only 3 months old and I charged it as well. I have tried every trick in the book such as unlocking from the outside and disconnecting hood sensor latch as well as the trunk, but nothing seems to be working. Any suggestions?

Horn and not cranking is correlated. The immobilizer is on , you need to disarm the car with the key fob

I don't have a key fob for my car, only key fob I have is for my aftermarket alarm system.

I don't have a key fob for my car, only key fob I have is for my aftermarket alarm system.