CHEVROLET ASTRO 2004 Owners Manual

This system is called OBD II (On-Board
Diagnostics-Second Generation) and is intended to
assure that emissions are at acceptable levels for the
life of the vehicle, helping to produce a cleaner
environment. The SERVICE ENGINE SOON or CHECK
ENGINE light comes on and a chime will sound to
indicate that there is a problem and service is required.
Malfunctions often will be indicated by the system
before any problem is apparent. This may prevent more
serious damage to your vehicle. This system is also
designed to assist your service technician in correctly
diagnosing any malfunction.
Notice:If you keep driving your vehicle with this
light on, after a while, your emission controls
may not work as well, your fuel economy may not
be as good and your engine may not run as
smoothly. This could lead to costly repairs that may
not be covered by your warranty.
Notice:Modi®cations made to the engine,
transmission, exhaust, intake or fuel system of your
vehicle or the replacement of the original tires
with other than those of the same Tire Performance
Criteria (TPC) can affect your vehicle's emission
controls and may cause this light to come on.
Modi®cations to these systems could lead to costly
repairs not covered by your warranty. This may
also result in a failure to pass a required Emission
Inspection/Maintenance test.
This light should come on, as a check to show you it is
working, when the ignition is on and the engine is
not running. If the light does not come on, have it
repaired. This light will also come on during a
malfunction in one of two ways:
·Light FlashingÐ A mis®re condition has been
detected. A mis®re increases vehicle emissions
and may damage the emission control system on
your vehicle. Diagnosis and service may be
required.
·Light On SteadyÐ An emission control system
malfunction has been detected on your vehicle.
Diagnosis and service may be required.
3-31

If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:
·Reducing vehicle speed.
·Avoiding hard accelerations.
·Avoiding steep uphill grades.
·If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops ¯ashing and remains on steady, see ªIf
the Light Is On Steadyº following.
If the light continues to ¯ash, when it is safe to do so,
stop the vehicle.Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart
the engine. If the light remains on steady, see ªIf
the Light Is On Steadyº following. If the light is still
¯ashing, follow the previous steps, and see your dealer
for service as soon as possible.
If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See
Filling Your Tank on page 5-6. The
diagnostic system can determine if the fuel cap has
been left off or improperly installed. A loose or missing
fuel cap will allow fuel to evaporate into the atmosphere.
A few driving trips with the cap properly installed
should turn the light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
Gasoline Octane on page 5-4. Poor fuel quality will
cause your engine not to run as efficiently as designed.
You may notice this as stalling after start-up, stalling
when you put the vehicle into gear, mis®ring, hesitation
on acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the
light to turn on.
3-32

If you experience one or more of these conditions,
change the fuel brand you use. It will require at least
one full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
your dealer can check the vehicle. Your dealer has
the proper test equipment and diagnostic tools to ®x any
mechanical or electrical problems that may have
developed.
Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments have or
may begin programs to inspect the emission control
equipment on your vehicle. Failure to pass this
inspection could prevent you from getting a vehicle
registration.Here are some things you need to know to help your
vehicle pass an inspection:
Your vehicle will not pass this inspection if the SERVICE
ENGINE SOON or CHECK ENGINE light is on or not
working properly.
Your vehicle will not pass this inspection if the OBD
(on-board diagnostic) system determines that critical
emission control systems have not been completely
diagnosed by the system. The vehicle would be
considered not ready for inspection. This can happen if
you have recently replaced your battery or if your
battery has run down. The diagnostic system is
designed to evaluate critical emission control systems
during normal driving. This may take several days
of routine driving. If you have done this and your vehicle
still does not pass the inspection for lack of OBD
system readiness, your GM dealer can prepare the
vehicle for inspection.
3-33

Oil Pressure Gage
The oil pressure gage
shows the engine oil
pressure in psi (pounds
per square inch) when the
engine is running.
Canadian vehicles indicate pressure in kPa
(kilopascals). Oil pressure may vary with engine speed,
outside temperature and oil viscosity, but readings
above the low pressure zone indicate the normal
operating range.
A reading in the low pressure zone may be caused by a
dangerously low oil level or other problems causing
low oil pressure.{CAUTION:
Do not keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches ®re. You or others could be burned.
Check your oil as soon as possible and have
your vehicle serviced.
Notice:Lack of proper engine oil maintenance may
damage the engine. The repairs would not be
covered by your warranty. Always follow the
maintenance schedule in this manual for changing
engine oil.
3-34

Security Light
This light will come on
brie¯y when you turn the
ignition key to START.
The light will stay on until the engine starts. If the light
¯ashes, the Passlock
žSystem has entered a tamper
mode. If the vehicle fails to start, seePasslockž
on page 2-16.
If the light comes on continuously while driving and
stays on, there may be a problem with the Passlock
ž
System. Your vehicle will not be protected by Passlockž,
and you should see your GM dealer.
Service All-Wheel Drive Light
This light should come on
brie¯y when you turn on
the ignition, as a check to
show you it is working.
The SERVICE AWD light comes on to indicate that
there may be a problem with the drive system and
service is required. Malfunctions can be indicated by the
system before any problem is apparent, which may
prevent serious damage to the vehicle. This system is
also designed to assist your service technician in
correctly diagnosing a malfunction.
3-35

Tow/Haul Mode Light
This light should come on
when the tow/haul mode
has been selected.
For more information, see ªTow/Haul Modeº in
Towing a
Trailer on page 4-35.
Check Gages Warning Light
The CHECK GAGES light
will come on brie¯y when
you are starting the
engine.
If the light comes on and stays on while you are driving,
check your coolant temperature and engine oil
pressure gages to see if they are in the warning zones.
Fuel Gage
The fuel gage tells you approximately how much fuel
you have remaining when the ignition is on.
When the gage ®rst indicates empty, you still have a
little fuel left, but you should get more fuel as soon
as possible.
United StatesCanada
3-36

Here are things some owners ask about. None of these
indicate a problem with your fuel gage:
·At the gas station, the gas pump shuts off before
the gage reads full.
·The fuel tank will take either a little more or a little
less fuel to ®ll up than the gage shows.
·The gage moves a little when you turn a corner or
speed up.
·The gage doesn't go back to empty when you turn
off the ignition.
Low Fuel Warning Light
The LOW FUEL light will
come on brie¯y when you
are starting the engine.
This light comes on when the fuel tank is low on fuel.
To turn it off, add fuel to the fuel tank. See
Fuel on
page 5-4.
3-37

Audio System(s)
Notice:Before you add any sound equipment to
your vehicle ± like a tape player, CB radio, mobile
telephone or two-way radio ± be sure you can
add what you want. If you can, it's very important to
do it properly. Added sound equipment may
interfere with the operation of your vehicle's engine,
radio or other systems, and even damage them.
Your vehicle's systems may interfere with the
operation of sound equipment that has been added
improperly.
So, before adding sound equipment, check with
your dealer and be sure to check federal rules
covering mobile radio and telephone units.
Your audio system has been designed to operate easily
and to give years of listening pleasure. You will get
the most enjoyment out of it if you acquaint yourself with
it ®rst. Figure out which radio you have in your vehicle,
®nd out what your audio system can do and how to
operate all of its controls to be sure you're getting the
most out of the advanced engineering that went into it.
Your vehicle has a feature called Retained Accessory
Power (RAP). With RAP, you can play your audio
system even after the ignition is turned off. See
ªRetained Accessory Power (RAP)º under
Ignition
Positions on page 2-17.
Setting the Time for Radios with the
Set Button
Press SET. Within ®ve seconds, press and hold the left
SEEK arrow until the correct hour appears on the
display. Press and hold the right SEEK arrow until the
correct minute appears on the display.
Setting the Time for Radios with HR
and MN Buttons
Press and hold HR until the correct hour appears on the
display. Press and hold MN until the correct minute
appears on the display. To display the time with
the ignition off, press RECALL or HR/MN and the time
will be displayed for a few seconds. There is an
initial two-second delay before the clock goes into the
time-set mode.
3-38

AM-FM Radio
Playing the Radio
Power:Turn the VOLUME knob to turn the system on
and off.
VOLUME:Turn this knob to increase or to decrease
volume.
RECALL:Press this knob to switch the display between
the radio station frequency and the time. Time display
is available with the ignition turned off.
Finding a Station
AM-FM:Press this knob to switch between FM1, FM2,
and AM. The display will show your selection.
TUNE:Turn this knob to select radio stations.
oSEEKp:Press the right or the left arrow to go to
the next or to the previous station and stay there.
oSCANp:Press both SCAN arrows at the same
time. SCAN will appear on the display. The radio will go
to the next station, play for a few seconds, then go
on to the next station. Press the RECALL knob or either
SCAN arrow to stop scanning.
Setting Preset Stations
The four numbered pushbuttons let you return to your
favorite stations. You can set up to 21 stations
(seven FM1, seven FM2, and seven AM) by performing
the following steps:
1. Turn the radio on.
2. Press AM-FM to select FM1, FM2, or AM.
3. Tune in the desired station.
3-39

4. Press SET. SET will appear on the display.
5. Press one of the four pushbuttons within ®ve
seconds. Whenever you press that numbered
pushbutton, the station you set will return.
6. Repeat the steps for each pushbutton.
In addition to the four stations already set, up to three
more stations may be preset on each band by pressing
two adjoining pushbuttons at the same time and by
performing the following steps:
1. Tune in the desired station.
2. Press SET. SET will appear on the display.
3. Press two adjoining pushbuttons at the same time,
within ®ve seconds. Whenever you press the same
two pushbuttons, the station you set will return.
4. Repeat the steps for each pushbutton.Setting the Tone (Bass/Treble)
BASS:Slide this lever up or down to increase or to
decrease bass.
TREB (Treble):Slide this lever up or down to increase
or to decrease treble. If a station is weak or noisy,
you may want to decrease the treble.
Adjusting the Speakers (Balance/Fade)
BAL (Balance):Turn the control ring behind the
upper knob to move the sound toward the left or the
right speakers.
FADE:Turn the control ring behind the lower knob to
move the sound toward the front or the rear speakers.
3-40