Toyota 2012 Yaris Hatchback Owner's Manual page 58

1-6. Theft deterrent system
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Alarm-operated door lock
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When the alarm is operating, the doors are locked automatically to pre-
vent intruders.
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Do not leave the key inside the vehicle when the alarm is operating, and
make sure the key is not inside the vehicle when recharging or replacing
the battery.
NOTICE
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To ensure the system operates correctly
Do not modify or remove the system. If modified or removed, the proper
operation of the system cannot be guaranteed.
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