Theft Deterrent System; Immobilizer System - Toyota 2010 Prius Owner's Manual

1-7. Theft deterrent system

Immobilizer system

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.
■
System maintenance
The vehicle has a maintenance-free type of immobilizer system.
■
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.
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The indicator light flashes after
the "POWER" switch has been
turned OFF to indicate that the
system is operating.