Hyundai Elantra MD/UD: Opening the trunk with the alarm armed (if equipped)
When the alarm is armed, the alarm will not sound if the trunk lid is opened with the transmitter (or smart key).
Once the trunk is opened and then closed, the trunk will be locked automatically and the system will be armed again. Also, if any of the doors or hood is opened while the trunk lid is open and the alarm is armed, the alarm will sound.