TOYOTA 2010 Sienna - Manual (Page 141)

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1-6. Theft deterrent system
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Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft, make sure
of the following.
●
Nobody is in the vehicle.
●
The windows and moon roof are closed before the alarm is set.
●
No valuables or other personal items are left in the vehicle.
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Triggering of the alarm
The alarm may be triggered in the following situations.
(Stopping the alarm deactivates the system.)
●
A person inside the vehicle opens a door or hood.
●
The battery is recharged or replaced when the vehicle is locked.
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When the battery is disconnected
Be sure to deactivate the alarm system.
If the battery is disconnected before deactivating the alarm system, the
alarm may be triggered when the battery is reconnected.