Toyota Matrix 2009 Owner's Manual page 39

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
n
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.
1-6. Theft deterrent system
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