It has a rear seat motion sensor. Leaving the windows down probably triggers something.Twice now we have parked the car leaving the rear windows down 2 -3" for ventilation only to return to the car with the horn blaring and 4 ways flashing. Doesn't happen with all the windows up tight. Any other's had this issue?
It is intended as a safety feature so you don’t leave a child or pet in the rear seat. There is a way to turn it off in the settings.