2002 CHEVROLET IMPALA sensor

1-8
When the seat is not in use, it should be kept in the
upright locked position. If you plan to load items into
the trunk through the split folding rear seat, you must
first turn off the trunk release sensor. See ªTrunk
Release Sensorº in the Index for more information.
CAUTION:
If the seatback isn't locked, it could move forward
in a sudden stop or crash. That could cause injury
to the person sitting there. Always press rearward
on the seatback to be sure it is locked.
CAUTION:
A safety belt that is improperly routed, not
properly attached, or twisted won't provide the
protection needed in a crash. The person wearing
the belt could be seriously injured. After raising
the rear seatback, always check to be sure that
the safety belts are properly routed and attached,
and are not twisted.
Safety Belts: They're for Everyone
This part of the manual tells you how to use safety belts
properly. It also tells you some things you should not do
with safety belts.
And it explains the air bag system.
CAUTION:
Don't let anyone ride where he or she can't wear
a safety belt properly. If you are in a crash and
you're not wearing a safety belt, your injuries
can be much worse. You can hit things inside the
vehicle or be ejected from it. You can be seriously
injured or killed. In the same crash, you might
not be if you are buckled up. Always fasten your
safety belt, and check that your passengers' belts
are fastened properly too.

1-30
In many crashes severe enough to inflate an air bag,
windshields are broken by vehicle deformation.
Additional windshield breakage may also occur
from the right front passenger air bag.

Air bags are designed to inflate only once. After an
air bag inflates, you'll need some new parts for your
air bag system. If you don't get them, the air bag
system won't be there to help protect you in another
crash. A new system will include air bag modules
and possibly other parts. The service manual for
your vehicle covers the need to replace other parts.

Your vehicle is equipped with an electronic frontal
sensor, which helps the sensing system distinguish
between a moderate frontal impact and a more
severe frontal impact. Your vehicle is also equipped
with a crash sensing and diagnostic module, which
records information about the frontal air bag system.
The module records information about the readiness
of the system, when the system commands air bag
inflation and driver's safety belt usage at
deployment. The module also records speed, engine
rpm, brake and throttle data.

Let only qualified technicians work on your air bag
systems. Improper service can mean that an air
bag system won't work properly. See your dealer
for service.
NOTICE:
If you damage the covering for the driver's or
the right front passenger's air bag, or the air bag
covering on the driver's seatback, the bag may
not work properly. You may have to replace the
air bag module in the steering wheel, both the
air bag module and the instrument panel for
the right front passenger's air bag, or the air
bag module and seatback for the driver's side
impact air bag. Do not open or break the air
bag coverings.

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.

2-17
Disabling the Trunk Release Sensor
A. Sensor Lens
B. Disable SwitchBecause the sensor detects motion, there are times when
you may want to turn off the trunk sensor so that the
motion of your vehicle or items in the trunk won't cause
the trunk to open, such as the following:

when your vehicle is transported on a car ferry,

when your vehicle is towed, or

when you will be loading items through the opening
in the split folding rear seat (if equipped).
Next to the sensor lens, there is a disable switch you can
use to turn off the trunk release sensor. To turn off the
sensor, turn the ignition to ON and press the switch next
to the lens for two seconds. The horn will chirp once
when the sensor is turned off. When the sensor is off,
the light in the switch will flash. The TRUNK OPEN
message in the message center will flash for one minute
each time the ignition is turned on as a reminder that
the sensor is turned off. See ªTrunk Open Messageº in
the Index.
To turn the sensor on again, press the switch again
or open the trunk. When the trunk is opened, the
sensor is automatically turned back on. If the sensor is
turned back on with the disable switch, the horn will
chirp twice.

2-18
Servicing the Trunk Release Sensor
The sensor lens should be inspected periodically. If the
lens is dirty, wipe it gently with a clean, soft cotton cloth.
If there is an electrical problem with the sensor, the
SERVICE VEHICLE SOON message will appear in the
message center. There are other possible reasons for this
message to appear. Be sure to see your dealer as soon as
possible. See ªService Vehicle Soon Messageº in the
Index for more information.
Theft
Vehicle theft is big business, especially in some cities.
Although your vehicle has a number of theft
-deterrent
features, we know that nothing we put on it can make
it impossible to steal. However, there are ways you
can help.
Key in the Ignition
If you leave your vehicle with the keys inside, it's an
easy target for joy riders or professional thieves
-- so
don't do it.
When you park your vehicle and open the driver's door,
you'll hear a chime reminding you to remove your key
from the ignition and take it with you. Always do this.
Your ignition and transaxle will be locked. And
remember to lock the doors.
Parking at Night
Park in a lighted spot, close all windows and lock your
vehicle. Remember to keep your valuables out of sight.
Put them in a storage area, or take them with you.
Parking Lots
Even if you park in a lot where someone will be
watching your vehicle, it's still best to lock it up and
take your keys. But what if you have to leave your
ignition key?

If possible, park in a busy, well
-lit area.

Put your valuables in a storage area, like your trunk
or glove box.

Be sure to close and lock the storage area.

Close all windows.

Lock the glove box.

Lock all the doors except the driver's.

Then take the door key and remote keyless entry
transmitter with you.

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TRNKJAMB (Trunk Jamb): This feature allows
the content theft system trunk lock sensor to be
disabled or enabled.
Programmable Modes
Mode 1: TRNK OFF
-- Turns feature off.
Mode 2: TRNK ON
-- Turns feature on.
Before your vehicle was shipped from the factory, it was
programmed to Mode 2. The mode to which your
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, do the following:1. Scroll, using the SEEK up or down arrows, until
TRNKJAMB appears on the display.
2. Press the PREV or NEXT button to enter the submenu.
The current selection will have an asterisk (*) next to
it. If you do not wish to change the current mode, you
can either exit the programming mode by following the
directions later in this section or program the next
feature available on your vehicle.
3. Scroll, using the PREV or NEXT buttons, through
the modes to change the current mode.
4. With your preference displayed, press the DISP
button to select. A chime will be heard to verify the
new setting. The new selection will be displayed
with an asterisk (*) for one second.
The mode you selected is now set. You can either exit
the programming mode by following the instructions
later in this section or program the next feature available
on your vehicle.

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NEUTRAL (N): In this position, your engine doesn't
connect with the wheels. To restart when you're already
moving, use NEUTRAL (N) only. Also, use
NEUTRAL (N) when your vehicle is being towed.
CAUTION:
Shifting out of PARK (P) or NEUTRAL (N) while
your engine is ªracingº (running at high speed) is
dangerous. Unless your foot is firmly on the
brake pedal, your vehicle could move very
rapidly. You could lose control and hit people or
objects. Don't shift out of PARK (P) or
NEUTRAL (N) while your engine is racing.
NOTICE:
Damage to your transaxle caused by shifting out
of PARK (P) or NEUTRAL (N) with the engine
racing isn't covered by your warranty.
AUTOMATIC OVERDRIVE (D): This position is
for normal driving. If you need more power for passing,
and you're:

Going less than 35 mph (55 km/h), push your
accelerator pedal about halfway down.

Going about 35 mph (55 km/h) or more, push the
accelerator pedal all the way down.
You'll shift down to the next gear and have more power.
NOTICE:
If your vehicle seems to start up rather slowly,
or if it seems not to shift gears as you go faster,
something may be wrong with a transaxle system
sensor. If you drive very far that way, your
vehicle can be damaged. So, if this happens, have
your vehicle serviced right away. Until then, you
can use SECOND (2) when you are driving less
than 35 mph (55 km/h) and AUTOMATIC
OVERDRIVE (D) for higher speeds.

2-55
The exterior lamps control has three positions:
OFF:Pushing the control all the way in turns off the
exterior lamps.
Parking Lamps:Pulling the control out halfway will
turn on the parking lamps together with the following:

Taillamps

LIcense Plate Lamps

Instrument Panel Lights
Headlamps: Pulling the control all the way out turns on
the headlamps together with the previously listed lamps
and lights. See ªInterior Lampsº later in this section for
information on the instrument panel brightness control
and on the dome lamps. A warning chime will sound if
you open the driver's door when the ignition switch is
off and the headlamps are on.
Daytime Running Lamps / Automatic
Headlamp Control
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the day.
DRL can be helpful in many different driving
conditions, but they can be especially helpful in the
short periods after dawn and before sunset. Fully
functional daytime running lamps are required on all
vehicles first sold in Canada.A light sensor on top of the instrument panel makes the
DRL work, so be sure it isn't covered.
The DRL system's automatic headlamp control will
make your high
-beam headlamps come on at a reduced
brightness when the following conditions are met:

The ignition is on,

the exterior lamps control is off and

the gearshift is not in PARK (P).
When the DRL are on, only your high
-beam
headlamps, at a reduced level of brightness, will be on.
The headlamps, taillamps, sidemarker and other lamps
won't be on. Your instrument panel and cluster won't be
lit up either.
When it's dark enough outside, your high
-beam
headlamps will turn off and the headlamps and parking
lamps will turn on. The other lamps that come on with
your headlamps will also come on.
When it's bright enough outside, your headlamps will go
off and your DRL will come on.
As with any vehicle, you should turn on the regular
headlamp system when you need it.