Toyota 2006 Prius Owner's Manual page 220

D
Deleting a group name
You can delete the group names indi-
vidually or all at once. If you delete a
group name, that group will return to
the default setting. (excluding
Group")
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1. Touch the "Delete" switch of "Group
Name".
220
"No
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2. Select the group you want to delete
the name of.
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3. Touch the "Yes" switch.