A vehicle authorization system for an authorized vehicle operator comprising: a) an aftermarket vehicle security device capable of activating vehicle functions when operably connected to a vehicle fuse port, the vehicle security device having three modes of operation: standby, ready, and activated, wherein: in standby mode access to the vehicle is allowed via the existing vehicle access system such as the vehicle key fob and vehicle key whenever an authorized user is present; in ready mode access to the vehicle is restricted via the existing vehicle access system such as the vehicle key fob and vehicle key; and in activated mode the vehicle doors and trunk/hatch remain locked , preventing access to the vehicle; b) a user's smart device for an authorized vehicle operator that receives communications from the vehicle security device ; c) a sensor in the vehicle that communicates with the vehicle security device that detects at least one vehicle access parameter via a first electronic signal; d) wherein the vehicle security device transmits to the user's smart device responsive to the sensor detecting a second signal associated with the access parameter to affirm a verification signal from the user's smart device to be in the ready mode when the user's smart device for an authorized vehicle operator is outside of a range indicating the user is no longer present; and e) the vehicle security device interrupts power to a vehicle's ECUs upon command signals from the vehicle security device thereby preventing vehicle doors and trunk from being unlocked. a) an aftermarket vehicle security device capable of activating vehicle functions when operably connected to a vehicle fuse port, the vehicle security device having three modes of operation: standby, ready, and activated, wherein: in standby mode access to the vehicle is allowed via the existing vehicle access system such as the vehicle key fob and vehicle key whenever an authorized user is present; in ready mode access to the vehicle is restricted via the existing vehicle access system such as the vehicle key fob and vehicle key; and in activated mode the vehicle doors and trunk/hatch remain locked , preventing access to the vehicle; in standby mode access to the vehicle is allowed via the existing vehicle access system such as the vehicle key fob and vehicle key whenever an authorized user is present; in ready mode access to the vehicle is restricted via the existing vehicle access system such as the vehicle key fob and vehicle key; and in activated mode the vehicle doors and trunk/hatch remain locked , preventing access to the vehicle; b) a user's smart device for an authorized vehicle operator that receives communications from the vehicle security device ; c) a sensor in the vehicle that communicates with the vehicle security device that detects at least one vehicle access parameter via a first electronic signal; d) wherein the vehicle security device transmits to the user's smart device responsive to the sensor detecting a second signal associated with the access parameter to affirm a verification signal from the user's smart device to be in the ready mode when the user's smart device for an authorized vehicle operator is outside of a range indicating the user is no longer present; and e) the vehicle security device interrupts power to a vehicle's ECUs upon command signals from the vehicle security device thereby preventing vehicle doors and trunk from being unlocked. <EOS>