Toyota PRIUS Manual page 200

1-8. Theft deterrent system
Alarm-operated door lock

When the alarm is operating, the doors are locked automatically to prevent
intruders.
 Canceling and automatic re-enabling of the intrusion sensor
 The alarm will still be set even when the intrusion sensor is canceled.
 After the intrusion sensor is canceled, pressing the "POWER" switch or
unlocking the doors using the entry function or wireless remote control
will re-enable the intrusion sensor.
 When the alarm system is set again, the intrusion sensor will be set.
 Intrusion sensor considerations
The sensor may trigger the alarm in the following situations:
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 Persons or pets are in the vehicle.
The vehicle is parked in a place where

extreme vibrations or noises occur,
such as in a parking garage.