2002 CHEVROLET IMPALA ECU

2-7
Power Door Locks
A power door lock switch is
located on each front door
above the armrest.
Press the top part of the switch to unlock all doors, or
press the bottom part of the switch to lock all doors.
The rear doors do not have power door lock switches.
The lever on each rear door works only that door's lock.
It won't lock or unlock all the doors.
If your vehicle has the optional content theft
-deterrent
system and it is armed, the power door lock switches
will be disabled. You must use your remote keyless
entry transmitter or your key to unlock the doors when
the system is armed.
Programmable Automatic Power Door Locks
Programmable automatic power door locks are a
standard feature that is intended to provide enhanced
security and convenience by automatically locking and
unlocking doors.
Programmable Modes
Mode 1: No automatic door lock or unlock.
Mode 2: Automatic all
-door lock when the transaxle is
shifted out of PARK (P); no automatic door unlock.
Mode 3: Automatic all
-door lock when the transaxle is
shifted out of PARK (P); automatic unlock for the driver's
door only when the transaxle is shifted into PARK (P).
Mode 4: Automatic all
-door lock when the transaxle is
shifted out of PARK (P); automatic all
-door unlock
when the transaxle is shifted into PARK (P).
Before your vehicle was shipped from the factory, it was
programmed to Mode 4. The mode to which the vehicle
was programmed may have been changed since it left the
factory. To determine the mode to which your vehicle is
programmed or to program your vehicle to a different
mode, see ªVehicle Customization Settingsº in the Index.
Disconnecting the battery for up to a year will not
change the programmed mode of the programmable
automatic power door locks.

2-8 Rear-Door Security Locks
Your vehicle is equipped with rear-door security locks
that help prevent passengers from opening the rear doors
of your vehicle from the inside.
To use one of these locks do the following:
1. Open one of the rear doors.
2. On the inside of the rear
door will be a lock with
a label as shown. Slide
the lever located next
to the label upward to
engage the lock.
3. Close the door.
4. Repeat the procedure on the other rear
-door lock.To disengage the lock(s), reverse the steps.
The rear doors of your vehicle cannot be opened from
the inside when this feature is in use. If you want to
open the rear door when the security lock is on, unlock
the door and then open the door from the outside.
Lockout Protection Feature
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 a 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. A chime will
sound continuously until all doors are closed.
Leaving Your Vehicle
If you are leaving the vehicle, take your keys, open your
door and set the locks from inside. Then get out and
close the door.

2-11
Transmitter Verification (If Equipped)
This feature provides feedback to the holder of the
remote keyless entry transmitter that a command has
been received by the keyless entry receiver. The
headlamps and back
-up lamps will flash on every lock
and the first unlock command, and the horn will sound
once for every lock and twice for the first unlock
command. Silent operation and other options may be
selected for this feature (see ªVehicle Customization
Settingsº in the Index).
If your vehicle has the optional content theft
-deterrent
system, the first time the remote unlock is received,
three flashes and chirps will be seen to indicate an alarm
condition has occurred since last arming. See ªContent
Theft
-Deterrent Systemº in the Index.
Illumination on Remote Activation
This feature provides interior illumination when a
remote keyless entry unlock command is received and
executed, the trunk release button is pressed or when
the panic alarm is activated. The interior lamps will
illuminate until the ignition is turned to ON or untilan illumination period of 40 seconds has elapsed or the
doors are locked with the power door lock switch or the
remote keyless entry transmitter. If a door is opened
during the illumination period, the timed illumination
will be canceled, and the interior lamps will remain on
while the door is open.
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 a maximum of four
transmitters matched to it.
If you prefer, you can complete this procedure yourself.
See ªVehicle Customization Settingsº in the Index for
more information.

2-15
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.
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 TRUNK OPEN message will
appear in the message center of your instrument panel
cluster. See ªTrunk Open Messageº in the Index for
more information.
Trunk Release Handle
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
down 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.

2-16 Trunk Release Sensor TrapAlert
System
(If Equipped)
Your vehicle may have a sensor located on the underside
of the filler panel inside the trunk.If your vehicle has this feature, the sensor is designed to
open the trunk automatically under certain conditions.
If the sensor detects motion and a difference in
temperature in the trunk, the sensor will sound the horn
if the ignition is in OFF. There will be three short chirps
and a pause repeated for up to two minutes. After one
minute, the trunk latch will release. If the ignition is not
in OFF, the trunk latch will not release automatically
and the horn will not sound.
To cancel the horn alarm and automatically release the
trunk lid before two minutes are up, turn the ignition
to ON.
Do not cover the sensor with items you put into the
trunk or with add
-on accessory equipment. If the
sensor's field of view is blocked, it will not detect
motion and will not function properly.
Be sure to secure items in your trunk so that they won't
move around and cause the trunk to open.

2-30
Passlock
Your vehicle is equipped with the Passlock
theft
-deterrent system.
Passlock is a passive theft
-deterrent system. Passlock
enables fuel if the ignition lock cylinder is turned with a
valid key. If a correct key is not used or the ignition lock
cylinder is tampered with, fuel is disabled and the
engine will not start.
During normal operation, the SECURITY message will
be displayed after the key is turned to the ON ignition
position. See ªMessage Center, Securityº in the Index.
If the engine stalls and the SECURITY message flashes,
wait until the light stops flashing before trying to restart
the engine.
If the engine is running and the SECURITY message
comes on, you will be able to restart the engine if you turn
the engine off. However, your Passlock system is not
working properly and must be serviced by your dealer.
Your vehicle is not protected by Passlock at this time. You
may also want to check the fuse (see ªFuses and Circuit
Breakersº in the Index). See your dealer for service.
In an emergency, contact Chevrolet Roadside
Assistance. See ªRoadside Assistanceº in the Index for
more information.
New Vehicle ªBreak-Inº
NOTICE:
Your vehicle doesn't need an elaborate
ªbreak
-in.º But it will perform better in
the long run if you follow these guidelines:

Don't drive at any one speed -- fast or
slow
-- for the first 500 miles (805 km).
Don't make full
-throttle starts.

Avoid making hard stops for the first
200 miles (322 km) or so. During this time
your new brake linings aren't yet broken
in. Hard stops with new linings can mean
premature wear and earlier replacement.
Follow this breaking
-in guideline every
time you get new brake linings.

Don't tow a trailer during break
-in.
See ªTowing a Trailerº in the Index for
more information.

2-71
Remote Diagnostics: If an instrument panel light comes
on, press the OnStar Services button. An advisor can
perform a check of the engine on
-board computer, and
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. (Requires activation and additional fee).
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.
Route Support: An advisor can provide directions or
guidance to most places you want to go. In addition,
they can help you locate gas stations, rest areas, ATMs,
hospitals, hotels, stores, eateries and more.
Ride Assist: An advisor can locate transportation in the
event that you are unable to drive.
Concierge Services: The concierge advisor can obtain
tickets, reservations, or help with vacation/trip planning
and other unique items and services.

2-99
Security
United States Canada
This message is displayed to monitor the
Passlock

system.
If the security message is displayed continuously while
driving and stays on, there may be a problem with the
Passlock system. Your vehicle will not be protected by
Passlock, and you should see your dealer for service.Low Brake Fluid
United States Canada
This message will be displayed when your vehicle has a
brake problem. The brake system warning light will also
be illuminated.
If this message appears, the brakes aren't working
properly. You should have your vehicle serviced
immediately. See ªBrake System Warning Lightº in the
Index for more information.