2001 BUICK CENTURY ECU

2-12
Programmable Modes
Your vehicle can be programmed to one of the
following modes.
Mode 1: No Verification
Mode 2: Horn Chirp only
Mode 3: Headlamp Flash only
Mode 4: Horn Chirp and Headlamp Flash
When your vehicle was shipped from the factory, it was
programmed to Mode 3. The mode to which your
vehicle was programmed may have been changed since
it left the factory. To determine the security feedback
lock mode to which your vehicle is programmed
or to program your vehicle to a different mode,
do the following:
1. Close all doors and turn the ignition key to RUN.
2. Press and hold the power door lock switch in the
lock position.3. While holding the door lock switch in the lock
position, press and release the remote keyless
entry transmitter LOCK button. This will start the
customization mode. While in the customization
mode, the feature will sound the number of chimes
corresponding to the current lock mode. (If you
do not wish to change the current mode, you can
either exit the programming mode by following the
instructions listed here or program the next feature
available on your vehicle.)
4. Each additional press of the remote keyless entry
transmitter LOCK button will cause your vehicle to
advance the lock mode by one, starting from the
current lock mode.
5. If cycled beyond lock Mode 4, the vehicle will enter
lock Mode 1. When the door lock switch is released,
the vehicle will remain in the most recent lock mode.

2-13
When your vehicle was shipped from the factory, it was
programmed to Mode 3. The mode to which your vehicle
was programmed may have been changed since it left the
factory. To determine the security feedback unlock mode
to which your vehicle is programmed or to program your
vehicle to a different mode, do the following:
1. Close all doors and turn the ignition key to RUN.
2. Press and hold the power door lock switch in the
unlock position. While holding the door lock switch
in the unlock position, press and release the remote
keyless entry 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. (If you do not wish to change the
current mode, you can either exit the programming
mode by following the instructions listed here or
program the next feature available on your vehicle.)
3. Each additional press of the remote keyless entry
transmitter UNLOCK button will cause your vehicle
to advance the unlock mode by one, starting from
the current unlock mode.
4. If cycled beyond unlock Mode 4, the vehicle will
enter unlock Mode 1. When the door lock switch is
released, the vehicle will remain in the most recent
unlock mode.The mode you selected is now set. You can either
exit the programming mode by following the previous
instructions or program the next feature available on
your vehicle.
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 earlier 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.

2-15
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 ignition must be off for
the illumination on remote activation feature to work.
The interior lamps will light until either the ignition is
turned to RUN or 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.
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.

2-18 Trunk Assist Handle (If Equipped)
Your vehicle may have an assist handle located on
the inside of the trunk lid toward the driver's side of
the vehicle.Pull down on the handle to lower the trunk lid. Then
close the trunk with your other hand. If the trunk is
not properly closed, the DOOR/TRUNK light will
appear in the message center of your instrument panel
cluster. See ªDOOR/TRUNK Lightº in the Index
for more information.
NOTICE:
The trunk assist handle was not designed to be
used to tie down the trunk lid or as an anchor
point when securing items in the trunk. Improper
use of the trunk assist handle could damage it.

2-19 Trunk Release Handle (If Equipped)
NOTICE:
The trunk release handle was not designed to be
used to tie down the trunk lid or as an anchor
point when securing items in the trunk. Improper
use of the trunk release handle could damage it.
There is a glow-in-the-dark trunk release handle
located inside the trunk on the latch. This handle will
glow following exposure to light. Pull the release handle
up to open the trunk from the inside.
Trap-Resistant Trunk Kit
To help prevent a child from becoming trapped in your
trunk, you can order a trap
-resistant trunk kit from
your dealer. This kit includes:

a modified trunk latch,

a lighted release handle, and

seatback tethers (for vehicles with folding
rear seatbacks).
See your dealer for additional information.

2-21
PASS-Key
II
Your vehicle is equipped
with the PASS
-Key II
(Personalized Automotive
Security System)
theft
-deterrent system.
PASS
-Key II is a passive
theft
-deterrent system.
It works when you insert
or remove the key from
the ignition.
PASS
-Key II uses a resistor pellet in the ignition key
that matches a decoder in your vehicle.
When the PASS
-Key II system senses that someone is
using the wrong key, it shuts down the vehicle's starter and
fuel systems. For about three minutes, the starter won't
work and fuel won't go to the engine. If someone tries to
start your vehicle again or uses another key during this
time, the vehicle will not start. This discourages someone
from randomly trying different keys with different resistor
pellets in an attempt to make a match.
The ignition key must be clean and dry before it's inserted
in the ignition or the engine may not start. If the engine
does not start and the SECURITY light is flashing,
the key may be dirty or wet. Turn the ignition off.Clean and dry the key. Wait about three minutes and try
again. If the starter still won't work, and the key appears
to be clean and dry, wait about three minutes and try
another ignition key. At this time, you may also want to
check the fuse (see ªFuses and Circuit Breakersº in
the Index). If the starter won't work with the other key,
your vehicle needs service. If your vehicle does start,
the first ignition key may be faulty. See your dealer
or a locksmith who can service the PASS
-Key II.
If you accidentally use a key that has a damaged or
missing resistor pellet, the starter won't work. The
SECURITY light will then come on. But you don't have
to wait three minutes before trying another ignition key.
See your dealer or a locksmith who can service the
PASS
-Key II to have a new key made.
If you're ever driving and the SECURITY light comes
on, you will be able to restart your engine if you turn it
off. Your PASS
-Key II system, however, is not working
properly and must be serviced by your dealer. Your
vehicle is not protected by the PASS
-Key II system.
If you lose or damage a PASS
-Key II ignition key,
see your dealer or a locksmith who can service
PASS
-Key II to have a new key made. Also,
see ªRoadside Assistanceº in the Index for
more information.

2-54
Call ANSWER/END Button: Use this button
to answer a call. (If you are receiving a call, the audio
system will mute, and the ring will be heard). Press this
button at the end of a call to disconnect and return the
audio system to its previous settings. This button will
also cancel a call if one of the buttons is accidentally
pressed or if the automatic redial function is activated.
Volume Control: You can control the volume of the
OnStar System using either the volume control knob
on the radio or using the optional steering wheel
volume control.
Telltale Light: This light will indicate the status of
the system. A solid green light will come on when you
start the vehicle to let you know that the system is on
and is ready to make or receive calls.
If the light blinks green it means that an incoming
or outgoing call is in progress. Press the Call
ANSWER/END button if you notice the light
blinking and you are not on a call.The light will be red in the event of an OnStar system
malfunction. If this occurs press the OnStar button to
attempt to contact an advisor. If the connection is made,
the advisor will assist you with steps to take to make
sure that the system is functioning properly. If you
cannot contact the advisor, take your vehicle to your
dealership as soon as possible for assistance.
Safety and Security Services

Automatic Notification of Air Bag
Deployment
-- If an air bag deploys, a priority
emergency signal is automatically sent to the center.
An advisor will locate your vehicle's position, try to
contact you and assist you in the situation. If the
center is unable to contact you, an emergency service
provider will be contacted.

Stolen Vehicle Tracking
-- Call the center at
1
-888-4-ONSTAR (1-888-466-7827) to report your
vehicle stolen. The system can then locate and track
your vehicle and the advisor will be able to notify
the proper authorities.

2-55

Roadside Assistance with Location -- For vehicle
breakdowns, press the OnStar button. An advisor
will contact the appropriate help.

Remote Diagnostics
-- If an instrument panel
light comes on, the center can perform a check of
the engine on
-board computer. An advisor can then
recommend what action needs to be taken.

OnStar MED
-NET -- Med-Net can store your
personal medical history and provide it to emergency
personnel if necessary.

Accident Assist
-- An advisor can provide
step
-by-step guidance following an accident.

Remote Door Unlock
-- To contact the center, call
1
-888-4-ONSTAR. You will be required to provide
your security information. An advisor will send a
command to your vehicle to unlock itself. The
advisor can delay unlocking your vehicle. Remote
Door Unlock is disabled 48 hours after the vehicle is
parked to maintain the battery charge.
Vehicle Locator Service
-- To contact the center,
call 1
-888-4-ONSTAR. You will be required to
provide your security information. An advisor will
send a command to your vehicle to sound the horn
and/or flash the lamps.
In order to provide you with excellent service, calls with
the OnStar Center may be monitored or recorded.
Premium Services (Includes Safety and
Security Services)

Route Support -- An advisor can provide directions
or guidance to anywhere you want to go. In addition,
they can help you locate gas stations, rest areas,
ATMs, hospitals, hotels, stores, eateries and more.

Concierge Services
-- The concierge advisor can
obtain tickets, reservations, or help with vacation/trip
planning and other unique items and services.

Ride Assist
-- An advisor can locate transportation
in the event that you are unable to drive.