Chevrolet 2007 TrailBlazer Owner's Manua page 232

Unlock Doors
Press the customization button until UNLOCK
DOORS: IN PARK appears in the display.
To select your preference for automatic unlocking,
press the select button while UNLOCK DOORS:
IN PARK 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.
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 100.
232
Lock Feedback
Press the customization button until LOCK
FEEDBACK: BOTH appears in the display.
To select your preference for the feedback you
receive when locking the vehicle with the Remote
Keyless Entry (RKE) transmitter, press the
select button while LOCK FEEDBACK: BOTH
is displayed on the DIC. Pressing the select button
will scroll through the following choices:
LOCK FEEDBACK: BOTH (default): The parking
lamps will flash each time you press the button
with the lock symbol on the RKE transmitter
and the horn will chirp the second time you press
the lock button.
LOCK FEEDBACK: OFF: There will be no
feedback when locking the vehicle.
LOCK FEEDBACK: LAMPS: The parking lamps
will flash each time you press the button with
the lock symbol on the RKE transmitter.
LOCK FEEDBACK: HORN: The horn will chirp
the second time you press the button with the lock
symbol on the RKE transmitter.