TOYOTA 2011 Tundra - Manual (Page 141)

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1-6. Theft deterrent system
n Alarm-operated door lock
l When the alarm is operating, the doors are locked automatically to pre-
vent intruders.
l 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
n 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.