Patent ID: 6922147

Claim:
A warning system for detecting a child left in a car seat in a vehicle, the system comprising: a removable child car seat; a child occupant sensor, associated with the car seat, the child occupant sensor including an input to detect a child in the child car seat, and including an output providing a signal representative of whether a child is present in the child car seat; a temperature sensor, associated with the car seat, the temperature sensor including an input to detect an ambient vehicle temperature, and including an output to provide a signal responsive to the ambient vehicle temperature; and an alarm control circuit, associated with the car seat, coupled to the child occupant sensor output and the temperature sensor output, the alarm control circuit coupled to an alarm configured to provide, without requiring information about a vehicle ignition state, a warning using information about whether the child is present in the child car seat and the ambient vehicle temperature is outside an acceptable range.