ok this only started to happen yesterday i unlocked my car and open the door and the hazards when off for about 20seconds and then stopped

now like i said this only started yesterday nothing has been changed

maybe your alarm went off and your horn is broken?, your horn my work when pressed on the steering wheel but open one of your doors and try locking with the remote.... if it doesnt beep at you there is something wrong with your connection between your BEM and horn...

i dont have a remote.
but like i said it never used to do this and nothing has changed for it to do this

Edit, see that was already answered.

I can't think of anything else that would cause that?
Only thing i can think of that even remotely makes sense is maybe some sort of warning system for the battery or something?
And even that sounds stupid.

I didn't have the right door lock. So It thought it was locked but really it wasnt