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.
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