Buick 2001 Century Owner's Manual page 84

You have three actions possible once delayed locking
is activated:
D
Cancel the delayed locking by pressing the unlock
switch or by fully inserting the key in the ignition.
D
Override the delayed locking feature and lock the
doors immediately by pressing the lock switch a
second time.
D
Let the delayed locking feature complete the locking
of the vehicle.
If you wish to let the delayed locking feature complete
the locking of the vehicle, no additional action is
required. The delayed locking feature will lock the doors
automatically after all the doors have been closed for a
period of five seconds. During this five second period,
any door may be reopened, at which time the three
possible actions shown above are again available.
You may also customize your vehicle to activate the
delayed locking feature as described previously, or
you may choose to completely disable the feature at
all times. If disabled, the power door locks will activate
immediately when a power door lock switch is pressed.
2-14
The enabled/disabled state of the delayed locking
feature will be toggled when you perform the following
sequence with the doors closed and the ignition key
in RUN:
1. Apply your regular brakes.
2. Press and hold the power door unlock switch.
While holding the door unlock switch, move the
shift lever out of and back into PARK (P).
After an initial transaxle cycle, each additional cycle
will toggle the enable/disable state of the delayed
locking feature. During this procedure, the chime
will sound, providing you with feedback. In Mode 1,
a single chime will be heard if the delayed locking
feature is disabled. In Mode 2, two chimes will be
heard if the feature is enabled. When the door unlock
switch is released, the vehicle will remain in the most
recent operating mode.
Disconnecting the vehicle battery for up to a year
will not change the programmed mode of the delayed
locking feature.