Honking with no one in the car or near
 

Recently bought a Mazda 6 2.3 from 2007. Suddenly last night it started with no one near to honk continuesly. It stopped when I arrived and turned on the engine. But it comes back when I turn off the engine (ignition off). Strangely my turning signal also suddenly does not function when I drive. Neither the hazard signal. Any suggestions