Chevrolet 2003 Astro Owner's Manual page 88

If the sliding door is open and you press the power door
lock switch, the sliding door will not lock immediately.
After you close the door, the system comes on and locks
the sliding door in about five seconds.
When the key is in the ignition and the power door lock
switch is pressed with a door open, all doors are
locked while the driver's side door remains unlocked.
Programmable Automatic
Door Locks
Your vehicle is equipped with an auto IocWunlock
feature which enables you to program your power
door locks.
Your vehicle left the factory programmed to have all the
doors lock automatically when the shift lever is moved out
of PARK (P). All of the doors will unlock when the shift
lever is moved back into PARK (P). The following
instructions detail how to program your door locks.
To enter the program mode you need to do the following:
1. Begin with the ignition in OFF. Then, pull back on the
turn signaVmultifunction lever all the way toward you
and hold it while you perform the next step.
2. Turn your key to RUN and OFF twice. Then, with
the key in OFF, release the turn signaVmultifunction
lever. Once you do this, you will hear the lock
switch lock and unlock.
You are now ready to program the automatic door
locks. Select one of the following four programming
options and follow the instructions. You will have thirty
seconds to begin programming. If you exceed the
thirty second limit, the locks will automatically lock and
unlock to indicate that you have left the program mode.
If this occurs, repeat the procedure beginning with
Step 1. You can exit the program mode any time by
turning the ignition to RUN. The locks will automatically
lock and unlock to indicate that you are leaving the
program mode. If the IocWunlock switches are not
pressed while in the programming mode, the auto
IocWunlock setting will not be modified.
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