Vehicle security system and method of operation based on a mobile device location

A vehicle security system (10) for a vehicle (12) equipped with a passive keyless entry/passive start security system (14) (PEPS (14)) including a nomadic device (16) configured to determine a present location (20) of the nomadic device (16) (e.g. key fob, smart phone), and a controller configured to control a security-status based on the present location (20). The controller determines the security status based on the proximity of the nomadic device (16) in order to thwart theft of the vehicle (12) using a relay attack.