First post here! I have a 2013 Mazda3 sedan. When I start it up, almost every time, within 30 seconds, an alarm-type sound occurs for about 5 or so seconds inside the cabin. It sounds like "peew, peew, peew, peew, peew" (10X). Does anybody know what this is and how to get it to stop?

(I would have posted the video, but this forum has a 20 MB limit and does not accept mp4 files.)

Thank you!