GMC sierra 2002 User Manual

The following is a list of the available 
programming options:
D All doors lock/Only the driver’s door unlocks:

Press the lock side of the power door lock switch on
the door panel once and then the unlock side once.

D All doors lock/All doors unlock: Press the lock side

of the power door lock switch on the door panel
once, and then the unlock side twice.

D All doors lock/None of the doors unlock: Press the

lock side of the power door lock switch on the door
panel once, and then the unlock side three times.

D No doors lock/None of the doors unlock: Press the

lock side of the power door lock switch on the door
panel twice. This turns off the automatic lock feature.

For more information, see your dealer.

To protect you from locking your key in the vehicle, this
feature stops the power door locks from locking when
the key is in the ignition and a door is open.

If the power lock switch is pressed when a door is open
and the key is in the ignition, all of the doors will lock
and then the driver’s door will unlock.