Cadillac 2006 STS - Manual (Page 131)

Lock/Unlock
Your vehicle’s system may have one of the following
lock/unlock menus:
After making selections, touch the Back screen button
to return to the PERSONAL SETTINGS screen.
Select this screen button to change automatic door
locking and unlocking and keyless access transmitter
locking and unlocking. The following choices are
available:
Automatic Door Unlock
When this feature is off, the doors will not unlock
automatically and the doors will have to be unlocked
before exiting the vehicle. When this feature or any of the
following features are selected on, the button next to the
name will appear highlighted.
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