Nissan has revealed its Rear Door Alert (RDA) system, which helps those who have habit of forgetting to check what or who they left in their vehicle’s back seat. The latter is a real danger, as interior car temperatures can soar to deadly levels when left out under the sun.

“We pushed each other along and knew we were on the right track one morning when Marlene discovered she had left a pan of lasagna in the back seat of her car one night after coming home after a long day at the office,” said Elsa Foley, who is part of the team at Nissan Technical Center North America (NTCNA).

“The worst thing was the car smelled for days, but it made me ask myself, ‘what if that had been something else back there?'” she added. This epiphany sparked the idea for RDA, which will debut as standard equipment on the 2018 Pathfinder SUV in September.

The system is pretty straightforward, it reminds the driver to check the rear seat by using a series of distinctive honks as they are walking away from the vehicle. It detects if a rear door was opened or closed prior to a trip, but then was not re-opened again after the trip was completed.

“The idea is if you open a rear door, whether to put a child or a package in the rear seat, the vehicle will help alert you when you get to your destination that you may want to check the rear seat. We’ve built in enough time that you don’t have to rush, but if you don’t open the rear door again when you get out of the vehicle, we want you to think for a moment about what you may have put in the back seat,” explained Marlene Mendoza, another member of NTCNA.