This feels like a defect to me, though my dealer swears that it's a "safety feature". I'm unconvinced.
The front passenger seat will show gray if the seat is empty OR if the seat is occupied AND the passenger seat belt is fastened. If someone is seated in the passenger seat and the belt is not fastened, it will display red. This is pretty normal in cars these days.
For the 2nd and 3rd row seats, they all show red - even if nobody is seated in those seats, and even if the seats are laid flat. According to the dealer, it's part of a "self test", and the display will show them all as gray after a minute.
Here's my frustration: If it's red with empty back seats, every time I start my car, and for as long as it takes me to drive away, it's teaching me to ignore red seats in the back rows. What happens when I have kids in the back rows - how can I tell which seats are occupied without belts fastened if all seats without belts fastened show red?
It's a small detail, but strikes me as flatly dangerous to have it work so much differently than the passenger seat.
-Dean