Toyota Prius 2007 Owner's Manual page 224

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Changing the security code
The security code is 4 digits and the
default is "0000".
1. Touch the "Phone Book
switch.
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2. Touch the "Change" switch.
Lock"
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3. Input the security code.
Choose a new code that is hard for other
people to know.
When you change the security code, do
not forget the code. The dealers cannot
unlock the security when you forget it.
If you forget the security code, initialize
your personal data. (See "Initializing the
security code" on page 226.)
Each time you touch "R", an inputted digit
is deleted.