It COULD be a 1)fuse , 2)wire , 3) bad ground, 4)faulty 'clockspring' or harness, 5) faulty horn switch, 6) failed horn itself, Or any combination of those
RepairPal Certified shops can diagnose and repair your 2012 Toyota Tacoma. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.