Lexus LX 570 2009 Manual page 497

If "Phone Book Lock" is set
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If the security code is input and "Phone Book Lock" is set, the following functions
are locked:
Display of the phone book screen and transferring, registering, editing and
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deleting the phone book data
Display of the speed dial screen, registering, deleting the speed dial and speed
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dialing
Display of the other party' s name for calls being received or made
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Display of the dialed numbers screen and incoming call screen, deleting the
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dialed numbers and received numbers
Display of the phone information screen
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Changing the security code
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The speed dial screen is not displayed while driving.
When changing the security code
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Be sure to choose a number difficult for strangers to guess.
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Do not forget the security code. Even your Lexus dealer will be unable to dis-
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able the security. If you do forget the code, initialize all personal data. 
(P. 319)
3-5. Using the hands-free system (for cellular phone)
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