The system does not detect the presence of objects or passengers in the rear seat. It monitors when rear doors are opened and closed.
It is possible to receive an alert when there is no rear seat occupant, but alert conditions are met.
It is possible to receive no alert when there is an occupant in the rear seat, if alert conditions are not met. For example, if a rear seat occupant does not enter the vehicle through a rear door.
The audible warning does not sound when the front door is opened before you switch the ignition off.