Vehicle safety system, comprising: an inside air temperature sensor disposed within a passenger compartment of a vehicle and in communication with a heating, ventilation, and air conditioning (HVAC) controller disposed within said vehicle, said IAT sensor configured to provide a IAT sensor signal; an audio transducer being a speaker disposed within the passenger compartment, being part of an infotainment system and in communication with the infotainment system disposed within said vehicle, said speaker configured to provide an audio signal; and a safety controller in communication with said IAT sensor, said infotainment system, and various vehicle controllers (20, 32, 34, 36, 38), said safety controller having non-volatile memory containing instructions that, when executed, cause the safety controller to monitor the audio signal and the IAT sensor signal, determine whether an occupant is in the vehicle based on the audio signal, determine whether a value of the IAT sensor signal deviates from an acceptable temperature range, and transmit a command to at least one of the various vehicle controllers to perform a safety countermeasure when the safety controller determines that the vehicle is occupied and the value of the IAT sensor signal is outside the acceptable temperature range characterized in that the speaker comprises a first and second high frequency speaker (24C, 24D) and wherein the non-volatile memory further contains instructions that, when executed, cause the safety controller to transmit a first command to the infotainment system to generate a first ultrasonic signal via the first high frequency speaker while the second high frequency speaker provides a first audio signal based on the first ultrasonic signal, transmit a second command to the infotainment system to generate a second ultrasonic signal via the second high frequency speaker while the first high frequency speaker provides a second audio signal based on the second ultrasonic signal, and determine whether the occupant is in the vehicle based on a comparison of the first and second audio signals. an inside air temperature sensor disposed within a passenger compartment of a vehicle and in communication with a heating, ventilation, and air conditioning (HVAC) controller disposed within said vehicle, said IAT sensor configured to provide a IAT sensor signal; an audio transducer being a speaker disposed within the passenger compartment, being part of an infotainment system and in communication with the infotainment system disposed within said vehicle, said speaker configured to provide an audio signal; and a safety controller in communication with said IAT sensor, said infotainment system, and various vehicle controllers (20, 32, 34, 36, 38), said safety controller having non-volatile memory containing instructions that, when executed, cause the safety controller to monitor the audio signal and the IAT sensor signal, determine whether an occupant is in the vehicle based on the audio signal, determine whether a value of the IAT sensor signal deviates from an acceptable temperature range, and transmit a command to at least one of the various vehicle controllers to perform a safety countermeasure when the safety controller determines that the vehicle is occupied and the value of the IAT sensor signal is outside the acceptable temperature range characterized in that the speaker comprises a first and second high frequency speaker (24C, 24D) and wherein the non-volatile memory further contains instructions that, when executed, cause the safety controller to transmit a first command to the infotainment system to generate a first ultrasonic signal via the first high frequency speaker while the second high frequency speaker provides a first audio signal based on the first ultrasonic signal, transmit a second command to the infotainment system to generate a second ultrasonic signal via the second high frequency speaker while the first high frequency speaker provides a second audio signal based on the second ultrasonic signal, and determine whether the occupant is in the vehicle based on a comparison of the first and second audio signals.