While vehicle is parked and engine off, the horn began to sound off 15 minutes after driving, on its own. Immediately grab the keys to turn off with remote with no results. Attempted to start engine and horn still would not die. Last result was to disconnect battery. Of course this works. Reconnected after 2 hours and horn ceased. It is easy to assume a manufacturer electrical problem that is ongoing for these vehicles. I could only hope that this does not happen again or possibly cause a fire and burn my house down.