Chevrolet 2007 TrailBlazer Owner's Manua page 101

Programmable Locking Feature
Following are the two locking modes that can be
programmed:
Mode 1: All doors lock when the transmission is
shifted out of PARK (P).
Mode 2: All doors lock when the vehicle speed is
greater than 8 mph (13 km/h).
The automatic door locks were pre-programmed at
the factory to lock all the doors when the
transmission is shifted into gear. The following
instructions detail how to program your door locks
differently than the factory setting. Choose one
of the two programming options listed previously
before entering the program mode.
To enter the program mode, 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.
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 two programming
options listed previously, and press the lock
side of the power door lock switch to
cycle through the lock 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.
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