This happened to me also. I had put a sun screen up and went into work one morning. When I came back that evening I had the message on the DIC. After getting out and making a round to check if someone had tried to break in to the car, I remembered what I saw in the manual. If you leave a pet, or a wife in the car you have to turn off the motion sensor. The motion sensor is on the top center of the dash. My sun shade blocked it and caused the alarm. It only works if the top is up. Even if the windows are down but the top is up the mention sensor is activated when the car locks and arms itself.