A child restraint seat sensing device for a vehicle including a structural element at least partially defining a volume, wherein the structural element is located in a vehicle passenger seat between a seat base and seat back or is located behind the vehicle passenger seat, a stationary anchor in the vehicle, wherein the stationary anchor is located within the volume defined by the structural element, and a sensor mounted to the structural element, wherein the sensor is configured to detect whether a child restraint seat connector is attached to the stationary anchor.