GMC Sierra Classic 2007 Owner's Manual page 280

Unlock Doors (Automatic
Transmission only)
If you have an automatic transmission vehicle,
press the customization button until UNLOCK
DOORS appears in the display. To select
your preference for automatic unlocking, press the
select button while UNLOCK DOORS is displayed
on the DIC. Pressing the select button will
scroll through the following choices:
UNLOCK DOORS: IN PARK (default): All of the
doors will unlock when the vehicle is shifted
into PARK (P).
UNLOCK DRIVER: IN PARK: The driver's door
will be unlocked when the vehicle is shifted
into PARK (P).
UNLOCK DOORS: KEY OUT: All of the doors
will unlock when the key is taken out of the
ignition.
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UNLOCK DOORS: MANUALLY: The doors will
not be unlocked automatically.
Choose one of the available options and press the
customization button while it is displayed on the
DIC to select it and move on to the next feature. For
more information on automatic door locks, see
Programmable Automatic Door Locks on page 118.
Door Lock Delay (Crew Cab only)
If your DIC does not have this feature, you still
may be able to program the delayed locking
feature. See Delayed Locking on page 118 for
more information.
When locking the doors with the power lock switch
or the Remote Keyless Entry (RKE) transmitter
and a door is open, the delayed locking feature will
delay locking the doors until five seconds after
the last door is closed.