GMC 2000 Sierra - Manual (Page 84)

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D Do the same twice to turn off the automatic door
lock feature. No doors will lock or unlock. Auto
unlocking will not work if auto locking is turned off.
D Press the unlock side of the lock switch on the door
panel once to unlock the driver’s door and lock all
other doors.
D Do the same twice to unlock all the doors. All doors
lock and unlock. (This is the factory setting).
D Do the same three times to turn off the automatic
door lock feature. No doors will lock or unlock.
You can exit the program mode any time by turning the
ignition to ON.
The automatic lock feature will lock all the doors when the
vehicle speed is greater that 15 mph (24 km/h) for two
seconds. Your vehicle left the factory programmed to have
all the doors unlock once the key is removed from the
ignition and lock when vehicle speed exceeds 15 mph
(24 km/h). See your dealer for more information.
If the lock/unlock switches are not pressed while in the
programming mode, the respective auto lock/unlock
setting will not be modified.
Lockout Prevention
To protect you from locking your key in the vehicle, this
feature stops the power door locks from locking when
the keys are 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.
Keyless Entry System (If Equipped)
If your vehicle has this feature, you can lock and unlock
your doors from about 3 feet (1 m) up to 100 feet (30 m)
away using the remote keyless entry transmitter supplied
with your vehicle.
Your keyless entry system operates on a radio frequency
subject to Federal Communications Commission (FCC)
Rules and with Industry Canada.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.