TOYOTA 2010 Sienna - Manual (Page 139)

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1-6. Theft deterrent system
CAUTION
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTICE
■
To prevent damage to the key
Do not modify, remove or disable the engine immobilizer system. If any
unauthorized changes or modifications are made, the proper operation of
the system cannot be guaranteed.