I have a Mitsubishi ASX 2013. This morning I discovered a short beeping sound it goes off about every 45 seconds. It checked to see if it was my seatbelt, hand break or perhaps that my key battery was low (I put my key into the key compartment in the glove box) but so far it doesn't seem like any of those things are causing it. There are also no warning lights on to help indicate what the problem could be. To my knowledge it only goes on when the car is on.

I've attached a video in which you can hear the sound. It's kinda driving me nuts as subtle as it is.