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Your car's security light, often a small icon of a key or padlock, blinks or stays solid to indicate the status of your vehicle's anti-theft system. A steady light when the car is off means the system is armed. Rapid blinking when you insert the key usually signals the correct transponder code is being verified. If it continues flashing while you try to start the engine, it often means the key isn't recognized, which could be due to a dead battery in the key fob or a fault in the receiver. Car key security light meanings