my car has no horn and the door reminder when you open will not stop on 1996 Lexus GS300

The history is i change the transmission was not working and it takes time to wait for spares about a month so when this fix the battery was dead and i put new,and when i park the car it keeps that sound always on, maybe my battery will discharge again.
thanks a lot

Asked by for the 1996 Lexus GS300