Toyota Prius 2011 Manual page 55

If the smart key system does not operate properly
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Locking and unlocking the doors: Use the mechanical key. (P. 549)
Starting the hybrid system: P. 550
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When the electronic key battery is fully depleted
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P. 469
Customization that can be configured at Toyota dealer
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Settings (e.g. smart key system) can be changed. 
(Customizable features P. 596)
Certification for the smart key system
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For vehicles sold in the U.S.A.
FCC ID: NI4TMLF8-2
FCC ID: HYQ14ACX
FCC ID: HYQ13CZD
NOTE:
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful interfer-
ence, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
FCC WARNING:
Changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.
For vehicles sold in Canada
NOTE:
Operation is subject to the following two conditions: (1) this device may not
cause interference, and (2) this device must accept any interference, includ-
ing interference that may cause undesired operation of the device.
FCC ID: HYQ14ADF
FCC ID: HYQ13CZE
1-2. Key information
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