TOYOTA 2010 Prius - Manual (Page 135)

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1-7. Theft deterrent system
Immobilizer system
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System maintenance
The vehicle has a maintenance-free type of immobilizer system.
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Conditions that may cause the system to malfunction
●
If the key is in contact with a metallic object.
●
If the key is in close proximity to or touching a key to the security system
(key with a built-in transponder chip) of another vehicle.
The vehicle’s keys have built-in transponder chips that prevent the
hybrid system from starting if the key has not been previously regis-
tered in the vehicle’s on-board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
The indicator light flashes after
the “POWER” switch has been
turned OFF to indicate that the
system is operating.