Why does my Mazda 3 2005 sports model security light continually flash when car is locked car does not have an alarm system?

The flashing security light on your 2005 Mazda 3 indicates that the vehicle's immobilizer system is active, which is designed to prevent unauthorized starting of the engine. Even if your car doesn't have a traditional alarm system, this feature is standard in many vehicles to enhance security. If the light continues to flash after locking, it typically means the system is functioning normally. However, if you notice any starting issues or if the light behaves unusually, it may be worth consulting a mechanic or dealership for further diagnosis.