HEY GUY'S

so i went for a ride yesterday on my 2004 lowrider .when i got home i turned the bike off and was hearing a buzzing noise after checking it was coming from the siren . replaced the 9volt battery still buzzing .the security system works fine ....just the siren has anyone else had this problem and what was you fix .... and does anyone know if i could just go to to the horn instade of replacing the siren