Why does the dashboard red light flash after the car is turned off?

[DiBennett]

That indicator light indicates that the anti-theft system is active, which means the engine electronic anti-theft system is engaged. It is normal for the light to flash; if it doesn't flash, it may indicate a problem. Engine electronic anti-theft system: Each key is embedded with an anti-theft transponder. When the driver inserts the key into the ignition switch lock cylinder and turns it to the "ON" position, the electronic anti-theft ECU communicates with the key via radio frequency. If the key is confirmed to be legitimate, the anti-theft ECU will perform a password verification with the engine ECU. If the password verification is correct, the engine will be allowed to start. Classification of car anti-theft systems: mechanical anti-theft, electronic anti-theft, and network anti-theft.