Around two months ago, while driving through Serbia, our car suddenly started beeping. We first thought the beeping was part of the song that was on the radio, but it wasn’t. The beeping would last for a couple of seconds and then it would repeat after ~10 minutes. Soon, we would hear the beeping every 2 minutes.
I pulled over and started inspecting. No red lights and errors on the dashboard, no any obvious indications of the problem. So, we opened all the doors including the trunk, and closed them again, to make sure they are really closed. And, the culprit was revealed! The system was reporting that the trunk door was still open, even though it was closed. The red light flashed. And it was annoying!