Chevrolet 2007 TrailBlazer Owner's Manua page 102

Programmable Unlocking Feature
The following is the list of available programming
options:
Mode 1: Driver's door unlocks when the
transmission is shifted into PARK (P).
Mode 2: All doors unlock when the transmission
is shifted into PARK (P).
Mode 3: All doors unlock when the key is
removed from the ignition.
Mode 4: No automatic door unlock.
The automatic door locks were pre-programmed
at the factory to unlock all doors once the
transmission is shifted to PARK (P). The following
instructions detail how to program your door
locks differently than the factory setting. Choose
one of the four programming options listed
previously before entering the program mode.
To enter the program mode you need to do the
following:
1. Begin with the ignition off. Then pull the turn
signal/multifunction lever toward you and hold
it there while you perform the next step.
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2. Turn the key to RUN and LOCK twice.
Then, with the key in LOCK, release the
turn signal/multifunction lever. Once you do
this, you will hear the lock switch lock
and unlock, the horn will chirp twice, and a
30-second program timer will begin.
3. You are now ready to program the automatic
door locks. Select one of the four
programming options listed above, and press
the unlock side of the power door lock
switch to cycle through the unlocking options.
You will have 30 seconds to begin
programming. If you exceed the 30-second
limit, the locks will automatically lock and
unlock and the horn will chirp twice to indicate
that you have left the program mode. If this
occurs, repeat the procedure beginning
with Step 1 to re-enter the programming mode.
You can exit the program mode any time by turning
the ignition to RUN. The locks will automatically
lock and unlock and the horn will chirp twice to
indicate that you are leaving the program mode.
If the lock/unlock switches are not pressed while
in the programming mode, the current auto
lock/unlock setting will not be modified.
See your dealer for more information.