1999 BUICK CENTURY change key battery

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2-6
The operating mode of the Programmable Automatic
Power Door Locks will be changed when the driver
performs the following sequence with the engine not
running, the doors closed and the ignition key in RUN:
1. Apply your regular brakes.
2. Press and hold the power door lock switch. While
holding the door lock switch, move the shift lever
out of and back into PARK (P).
After an initial transaxle cycle, each additional cycle
will advance the operating mode by one, starting from
the current operating mode. During this procedure, the
automatic door lock and unlock functions will operate as
defined by each mode above, providing the driver with
feedback of the current operating mode. If cycled
beyond Mode 4, the vehicle will enter operating
Mode 1. When the door lock switch is released, the
vehicle will remain in the most recent operating mode.
Disconnecting the vehicle's battery for up to a year will
not change the programmed mode of the Programmable
Automatic Power Door Locks.Rear-Door Child Security Locks
Your vehicle is equipped with rear-door child security
locks that help prevent passengers from opening the rear
doors of your vehicle from the inside. To use one of
these locks:
1. Open one of the rear doors.

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2-8
This device complies with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation of
the device.
Changes or modifications to this system by other than an
authorized service facility could void authorization to
use this equipment.
This system has a range of about 3 feet (1 m) up to
30 feet (9 m). At times you may notice a decrease in
range. This is normal for any remote keyless entry
system. If the transmitter does not work or if you have
to stand closer to your vehicle for the transmitter to
work, try this:

Check to determine if battery replacement is
necessary. See the instructions that follow.

Check the distance. You may be too far from your
vehicle. You may need to stand closer during rainy
or snowy weather.

Check the location. Other vehicles or objects may be
blocking the signal. Take a few steps to the left or
right, hold the transmitter higher, and try again.

If you're still having trouble, see your dealer or a
qualified technician for service.Operation
Press UNLOCK once to
unlock the driver's door and
to turn on the interior lamps
(see ªIllumination on
Remote Activationº in the
Index for more details).
Press UNLOCK again within five seconds to unlock all
the doors. To lock all doors, press LOCK. To unlock the
trunk, press the trunk symbol on the remote keyless
entry transmitter. The trunk will only unlock if your
transaxle is in PARK (P).

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2-10
The operating mode of the Security Feedback unlock
feature will be changed when you perform the following
sequence with your vehicle's doors closed and the
ignition key in RUN:

Press and hold the power door unlock switch. While
holding the door unlock switch, press and release the
RKE transmitter unlock button. This will start the
customization mode.

While in the customization mode, the feature will
sound the number of chimes corresponding to the
current unlock mode.
Each additional press of the RKE transmitter unlock
button will cause your vehicle to advance the unlock
mode by one, starting from the current unlock mode. If
cycled beyond unlock Mode 4, the vehicle will enter
unlock Mode 1. During this procedure, the feature will
sound the number of chimes corresponding to the
current unlock mode, providing you with feedback.
When the door unlock switch is released, the vehicle
will remain in the most recent unlock mode.
Disconnecting the vehicle's battery for up to a year will
not change the programmed mode of the lock and
unlock Security Feedback features.Delayed Locking
Delayed Locking allows the doors to be locked while
passengers are exiting the vehicle. This feature also
provides a brief time period after all the doors are
closed, but before the doors are locked, in which the
doors may be reopened. Delayed Locking is user
programmable for enabling or disabling the feature.
Delayed Locking is activated when a door lock switch is
pressed while the key is not in the vehicle's ignition, and
a door is open. The door lock switch may be either the
lock switch on the door or on the remote keyless entry
transmitter (see ªRemote Keyless Entryº later in this
section for more details). The doors do not lock when
the lock switch is pressed, but instead, three chimes are
heard. These chimes indicate that the Delayed Locking
feature has been activated.
You have three actions possible once Delayed Locking
is activated:

Cancel the Delayed Locking by pressing the unlock
switch or by fully inserting the key in the ignition.

Override the Delayed Locking feature and lock the
doors immediately by pressing the lock switch a
second time.

Let the Delayed Locking feature complete the
locking of the vehicle.

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2-11
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 above, 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.
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.
Illumination on Remote Activation
This feature provides interior lighting when a remote
keyless entry door unlock command is received and
executed by your vehicle. Your vehicle's ignition must be
off for the Illumination on Remote Activation feature to
work. The interior lamps will light until your vehicle's
ignition is turned to RUN or for a period of 40 seconds has
elapsed. If a door is opened during the illumination period,
the timed lighting will be canceled, and the interior lamps
will remain on since a door is open.

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2-12 Matching Transmitter(s) To Your Vehicle
Each remote keyless entry transmitter is coded to
prevent another transmitter from unlocking your vehicle.
If a transmitter is lost or stolen, a replacement can be
purchased through your dealer. Remember to bring any
remaining transmitters with you when you go to your
dealer. When the dealer matches the replacement
transmitter to your vehicle, any remaining transmitters
must also be matched. Once your dealer has coded the
new transmitter, the lost transmitter will not unlock your
vehicle. Each vehicle can have only four transmitters
matched to it.
Battery Replacement
Under normal use, the battery in your remote keyless
entry transmitter should last about three years.
You can tell the battery is weak if the transmitter won't
work at the normal range in any location. If you have to
get close to your vehicle before the transmitter works,
it's probably time to change the battery.
NOTICE:
When replacing the battery, use care not to
touch any of the circuitry. Static from your
body transferred to these surfaces may damage
the transmitter.

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2-40
You can customize the vehicle to activate Delayed
Headlamp Illumination when your vehicle's ignition is
turned off under the conditions described above, or you
may choose not to activate this feature under any
conditions. You can turn the feature on and off when
you perform the following sequence with the doors
closed and the ignition key in RUN:
1. Press and hold the power door lock switch. While
holding the door lock switch, cycle the headlamp
switch on and then off two times.
2. Release the power door lock switch. These steps
must be carried out in a time period of less than
10 seconds, followed by a delay period of no more
than 10 seconds.
3. Then, press and hold the power door unlock switch.
While holding the door unlock switch, turn the headlamp
switch on and then off two times. Release the courtesy
door unlock switch. These operations must be carried out
in a time period of less than 10 seconds.
After releasing the door unlock switch, a single chime
will be heard if the Delayed Headlamp Illumination
function has been disabled; two chimes will be heard if
the feature has been enabled. Disconnecting the
vehicle's battery for up to a year will not change the
programmed operation of this feature.Interior Lamps
Instrument Panel Brightness Control
You can brighten or dim the instrument panel lights by
moving the LIGHTS dial. If you turn the dial past
MAX, your courtesy or interior lamps will come on.
Courtesy Lamps
When any door is opened, several lamps come on. These
lamps are courtesy lamps. They make it easy for you to
enter and leave your vehicle. You can also turn these
lamps on by twisting or turning the interior lights knob
all the way to the right.
Illuminated Entry
Your courtesy lamps will come on and stay on for a set
time whenever you press UNLOCK on the remote
keyless entry transmitter.
If you open a door, the lamps will stay on while it's open
and then turn off automatically about 25 seconds after
you close it. If you press UNLOCK and don't open a
door, the lamps will turn off after about 40 seconds.

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9-2
Automatic Dimming/Heated Outside
Rearview Mirror 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Power Connection 2-46 . . . . . . . . . . . . . . . . . . . . . .
Back-up Lamp Bulb Replacement 6-38 . . . . . . . . . . . . . . . . .
Battery 6-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Remote Keyless Entry 2-12 . . . . . . . . . . . . . .
Rundown Protection 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-3, 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-3, 8-4 . . . . . . . . . . . . . . .
Blizzard 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Adjustment 6
-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI 2-21, 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-30 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Shift Interlock 2-21, 2-28 . . . . . . . . . . . . . . . . . .
Transaxle Shift Interlock (BTSI) Check 7-16 . . . . . . . . . . .
Wear 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-10 . . . . . . . . . . . . . . . . . . . . . . . . . . BTSI 2
-21, 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-6 . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-64 . . . . . . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-14, 2-30, 4-27, 4-34 . . . . . . . . . . . . . . .
Cassette
Deck Service 7
-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player 3-15, 3-19, 3-23 . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player Care 3-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player Errors 3-16, 3-20, 3-24 . . . . . . . . . . . . . . . . . .
Center High-Mounted Stoplamp Bulb Replacement 6-35 . . . .
Center Passenger Position 1-26 . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Safety 4-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Oil Soon Light 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System Light 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-53 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in a Rear Outside Seat Position 1-43 . . . . . . . . . . .
Securing in the Center Rear Seat Position 1-45 . . . . . . . . . .
Securing in the Right Front Seat Position 1-47 . . . . . . . . . .
Top Strap 1-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .