sensor CHEVROLET IMPALA 2004 8.G Owners Manual

In many crashes severe enough to inate 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 inate only once. After an
air bag inates, 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 ination and driver’s safety belt
usage at deployment. The module also records
speed, engine RPM, brake and throttle data.
Let only qualied 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.
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3. Scroll, using the PREV or NEXT buttons, through
the modes to change the current mode.
4. With your preference displayed, press the
TUNE/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.
TRNKJAMB (Trunk Jamb)
This feature allows the content theft system trunk lock
sensor to be disabled or enabled.
Programmable Modes
Mode 1:TRNK OFF
Mode 2:TRNK ONYour vehicle was originally programmed to Mode 2. The
mode may have been changed since then. To determine
the current mode, or to change the mode, do the
following:
1. Scroll, using the SEEK /PSCAN 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
TUNE/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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The exterior lamps control has three positions:
Off:Push the control all the way in to turn off the
exterior lamps.
Parking Lamps:Pull the control out halfway to turn
on the parking lamps together with the following:
Taillamps
License Plate Lamps
Instrument Panel Lights
Headlamps:Pull the control all the way out to turn on
the headlamps together with the previously listed
lamps and lights. SeeInterior Lamps on page 3-17for
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 System
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
rst 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.
3-15

Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows the air bag symbol. The system
checks the air bag’s electrical system for malfunctions.
The light tells you if there is an electrical problem.
The system check includes the air bag sensors, the air
bag modules, the wiring and the crash sensing and
diagnostic module. For more information on the air bag
system, seeAir Bag Systems on page 1-51.This light will come on
when you start your
vehicle, and it will ash for
a few seconds. Then
the light should go out.
This means the system
is ready.
If the air bag readiness light stays on after you start the
vehicle or comes on when you are driving, your air
bag system may not work properly. Have your vehicle
serviced right away.
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Manual Compass Calibration
If the compass appears erratic and the calibration
symbol does not appear, you must manually put the
compass into the calibration mode.
Turn the ignition on and cycle the DIC to the
Compass/Temperature mode. Press the RESET button
for at least 10 seconds until the calibration symbol
appears and all segments of the compass display are
illuminated. A chime will sound to conrm that the
calibration mode is active. Release the button and
complete two or three 360° turns in an area free from
large metal objects. The calibration symbol will turn
off and the compass reading will be displayed. A chime
will sound to verify that the calibration is complete.
Error Displays

An error of the speed sensor or fuel sender will
cause -E- to be displayed.
In the absence of vehicle communications,
adash--isdisplayed.
If one of these error messages appear, see your dealer.
Trip Computer
There are ve trip computer displays which may be
stepped through by pushing the MODE button.
The information will appear in the following order:
AVG ECON (Average Fuel Economy):This shows the
average fuel economy since the last reset.
INST ECON (Instantaneous Fuel Economy):This
shows fuel economy for the most recent second
of driving.
RANGE (Trip Range):This shows the estimated
distance that can be traveled with the remaining fuel.
The fuel economy used to calculate range is based
on the last few hours of driving. When in a low
fuel condition, LO is displayed.
FUEL USED (Trip Fuel Used):This shows the
accumulated fuel used since the last reset.
AVG SPEED (Average Speed):This shows the
average speed since the last reset.
Resetting the Trip Computer
Press and hold the RESET button for at least three
seconds. The reset is acknowledged with all segments
of the display lit briey and a chime. A reset can
only be done in AVG ECON, FUEL USED and AVG
SPEED displays. Each setting must be reset individually.
3-55

Underhood Fuse Block (Lower)
Some fuses are in a fuse block in the engine
compartment on the passenger’s side of the vehicle.
SeeEngine Compartment Overview on page 5-12
for more information on location.
Relays Usage
FAN CONT #3Secondary Cooling Fan
(Passenger’s Side)
FAN CONT #2 Cooling Fan Control Relay
Relays Usage
FAN CONT #1 Primary Cooling fan (Driver’s Side)
IGN RELAY Ignition Relay
A/C CMPR HVAC Compressor
Fuses Usage
IGN SW Ignition Switch
RT I/P #3 Rear Defogger, Audio System
U/HOOD #2 Ignition Relay, AIR Pump
COOLING
FANSCooling Fans (Battery)
FAN CONT
#2Cooling Fan Control Relays #2 & #3
FAN CONT #1 Cooling Fan Control Relays #1
FUEL INJ Fuel Injectors
TRANS SOL Transmission Solenoids
A/C RLY
(COIL)HVAC Control Relay
ENG DEVICESCanister Purge Solenoid, Mass Air
Flow Sensor (MAF), AIR Pump
Relay & Valve Control
DFI MDL Direct Fire Ignition Module
OXY SENOxygen Sensor (Pre and Post
Converter)
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