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Hyundai Backseat Monitor Aims to Prevent Heatstroke

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CARS.COM — In-car heatstroke has claimed the lives of 739 children since 1998, according to scientists at, and car manufacturers are increasingly taking notice. Hyundai is the latest, with a system designed to detect a child inadvertently left behind in a car. The Rear Occupant Alert system uses an ultrasonic sensor to monitor the backseat, helping to detect the movements of children. Let’s take a closer look at how this monitor system works to help parents keep track of kids in the car.

Related: Lawmakers Propose Car Heatstroke Safety Act

Car computers and technology are constantly evolving, and manufactures are always looking for new ways to make their vehicles safer. Now instead of just being able to monitor whether someone is in a seat using sensors that detect weight, Hyundai has a more advanced solution to help the tragedy that can occur when a child is left in the backseat. The Rear Occupant Alert system uses ultrasonic sensors that detect movement to help prevent drivers from forgetting a child in the back seat.

If a child is detected, the system reminds the driver to check the backseat via a message on the instrument cluster’s LCD monitor in front of the steering wheel. Hyundai realizes that sometimes a display on the LCD monitor may not be enough. If movement is still detected after the driver exits the vehicle, the system will honk the horn, flash the lights and send a Blue Link alert to the driver’s smartphone via Hyundai’s Blue Link connected car system. This computer system will also help prevent cases of children accidentally locking themselves in a car, another dangerous accident that can lead to heatstroke. While child death in a car is not extremely common, Hyundai believes that even if just one child is saved by the display on the LCD monitor, the technology is well worth the price.

According to safety advocacy group, a child’s body overheats three to five times faster than an adult’s, and heatstroke occurs when the body’s temperature exceeds 104 degrees and the body’s organs begin to shut down; death usually occurs at 107 degrees. Most of these deaths are an accident, and the common theme among them is that caregivers are distracted by a change in routine and tired. The price of forgetting a child in the backseat is much more than the cost of investing in technology to prevent these deadly disasters. 

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“This system is a first step in preventing tragedies. We understand only a brief lapse in judgement and inattention can have terrible consequences,” Mike O’Brien, Hyundai Motor America vice president of product, corporate and digital planning, said in a statement.

Hyundai’s new system joins similar systems from GM and Nissan, but Hyundai’s works differently. GM’s Rear Seat Reminder doesn’t detect rear passengers or child-safety seats, but instead monitors a vehicle’s rear doors, activating when either door is opened or closed when the vehicle is running or within 10 minutes of it being started. It sounds a chime and displays a message on the instrument panel’s LCD. The system is currently on more than 20 Buick, Cadillac, Chevrolet and GMC models.

Nissan’s Rear Door Alert system also utilizes door sequence logic and an instrument-panel message alert like GM’s system, but adds multiple horn honks to remind drivers to check the rear seat after the vehicle is parked and the driver exits. The system is standard on the 2018 Pathfinder SUV and will make its way to other Nissan vehicles.

Hyundai’s Rear Occupant Alert system will be available starting on model-year 2019 vehicles.’s Editorial department is your source for automotive news and reviews. In line with’s long-standing ethics policy, editors and reviewers don’t accept gifts or free trips from automakers. The Editorial department is independent of’s advertising, sales and sponsored content departments.

Photo of Jennifer Geiger
News Editor Jennifer Geiger joined the automotive industry in 2003, much to the delight of her Corvette-obsessed dad. Jennifer is an expert reviewer, certified car-seat technician and mom of three. She wears a lot of hats — many of them while driving a minivan. Email Jennifer Geiger

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