When the central locking and alarm on my 2001 V70 is released using the remote / keyfob after 2 minutes it resets and locks again. I noticed that this happened this morning car locked again as we did not open the door within two minutes, but my daughter opened the rear door the alarm went off. Can anyone tell me what is supposed to happen if the car central locking is activated but the car is not entered within the two minute window.