Toyota PRIUS Owner's Manual page 179

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If a message regarding the state of the electronic key or power switch
mode, etc. is shown
To prevent trapping the electronic key inside the vehicle, leaving the vehicle
without turning off the power switch or other passengers from unintentionally
taking the key out of the vehicle, etc., a message that prompts the user to
confirm the state of the electronic key or power switch mode may be shown
on the multi-information display. In those cases, follow the instructions on the
display immediately.
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If "Key Battery Low Replace Key Battery" is displayed on the multi-infor-
mation display
The electronic key has a low battery. Replace the electronic key battery.
(→P. 562)
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Replacing the battery
→P. 562
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Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask
any authorized Toyota dealer or repairer, or another duly qualified and
equipped professional.
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If "A New Key has been Registered Contact Your Dealer for Details" is
displayed on the multi-information display
This message will be displayed each time the driver's door is opened when
the doors are unlocked from the outside for approximately 10 days after a
new electronic key has been registered.
If this message is displayed but you have not had a new electronic key regis-
tered, ask any authorized Toyota dealer or repairer, or another duly qualified
and equipped professional to check if an unknown electronic key (other than
those in your possession) has been registered.
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If a wrong key is used
The key cylinder rotates freely to isolate inside mechanism.
PRIUS_OM_OM47A31E_(EE)
3-1. Key information
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