When I open the door or when I turn off the engine and lock the doors the indicator lights start blinking for approximately 15 seconds. The little red light start blinking as well on the dash board...The car started doing it after I replaced the battery. I am not aware of any alarm in the car ( I just bought it a month ago) Do you think it is possible there is an alarm in the car?
Please help me!!!

I am lost.
No, I didn't buy it in a dealership....

it is from a broker from Miami...