I have a 2006 SRT-10 coupe. The other day the car was parked in my garage, unlocked. I went to open passenger door and as soon as I did the horn sounded. It was a long continuous sound that went on for 10 seconds or so and then shut off. I figured it must have been alarm. I got in car and drive down street. While driving the horn went off again continiously for 10 seconds or so and shut off. The car did this three or four times until I got to my destination. It was even doing while going 80 mph down the freeway. When I got back in the car, I drove it for a few minutes with no honking so I thought it was just a glitch, but then it started doing it again at random intervals until I got home and put it back in the garage. This morning I got up and went out and opened driver door and it went off again!!! Car was unlocked. I have no idea what is going on here. The alarm is a pulsation horn honk, right? This is a long continuous honk. Please help