Central Door Unlocking System; Power Door Locks - Buick 2004 LeSabre Owner's Manual

There are several ways to lock and unlock your vehicle.
If your vehicle has a content theft-deterrent system,
unlock the doors only with the key or remote keyless
entry system. This will avoid setting off the alarm.
To unlock the door from the outside, use your door key
or remote keyless entry transmitter. Turning the door
key toward the front of the vehicle will lock the
door. Turning the door key toward the rear of the
vehicle will unlock it.
To unlock the door from the inside, move the manual
door lock, located above the door handle, rearward. To
lock the door, move the manual door lock forward.
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Central Door Unlocking System

If your vehicle has a theft-deterrent system, all doors
will unlock if the key is held in the outside key cylinder
unlock position for more than two seconds. The
doors will also unlock if the key is turned to the unlock
position twice in three seconds.

Power Door Locks

With power door locks, you can lock or unlock all the
doors on your vehicle.
The power door lock
switches are located on
the driver's and front
passenger's door panels.