ignition CHEVROLET C3500 HD 2002 4.G Owner's Manual

2-57
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 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:
Modifications 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 the SERVICE ENGINE SOON or
CHECK ENGINE light to come on.
Modifications 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 doesn't come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.

2-63 Fuel Gage
United States CanadaThe fuel gage, when the ignition is on, tells you about
how much fuel you have left in your tank.
The gage will first indicate empty before you are out of
fuel, and you should get more fuel as soon as possible.
Here are four situations you may experience with your
fuel gage. None of these indicate a problem with the
fuel gage.

At the gas station, the fuel pump shuts off before
the gage reads full.

It takes a little more or less fuel to fill up than the
fuel gage indicated. For example, the gage may have
indicated the tank was half full, but it actually took a
little more or less than half the tank's capacity to fill
the tank.

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.
If you have a diesel engine, see ªFuel Gageº in the
Diesel Engine Supplement.

3-6
Ventilation Tips

Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defroster will work far better, reducing the
chance of fogging the inside of your windows.

When you enter a vehicle in cold weather, turn
the fan to HI for a few moments before driving.
This helps clear the intake ducts of snow and
moisture, and reduces the chance of fogging the
inside of your windows.

Keep the air path under the front seats clear of
objects. This helps air to circulate throughout
your vehicle.

The use of hood air deflectors may adversely
affect the performance of the heating and air
conditioning system.Audio Systems
Your audio system has been designed to operate easily
and give years of listening pleasure. You will get the
most enjoyment out of it if you acquaint yourself with it
first. Find 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.
Setting the Clock for Systems with the
SET Button
Press SET. Within five seconds, press and hold the right
SEEK arrow until the correct minute appears on the
display. Press and hold the left SEEK arrow until the
correct hour appears on the display.
Setting the Clock for Systems 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 clock 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.

3-7 AM-FM Stereo
Playing the Radio
Power: Turn the VOLUME knob clockwise to turn the
system on and counterclockwise to turn the system off.
VOLUME: Turn this knob clockwise to increase
volume. Turn it counterclockwise to decrease volume.
RECALL: Pressing this knob will display the station
being played or it will display the clock. Clock display
is available with the ignition turned off.Finding a Station
AM
-FM: Press this knob to switch between AM,
FM1 and FM2. The display shows your selection.
TUNE: Turn this knob to tune in radio stations.
SEEK: Press the right or left arrow to seek to
the next or previous station and stay there.
SCAN: Press both SCAN arrows. SCAN will
appear on the display. The radio will scan to the next
station, play for a few seconds, then scan to the next
station. Press the RECALL knob or both SCAN arrows
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 AM, seven FM1 and seven FM2) by performing
the following steps:
1. Turn the radio on.
2. Press AM
-FM to select AM, FM1 or FM2.
3. Tune in the desired station.
4. Press SET. SET will appear on the display.

3-9 AM-FM Stereo with Cassette Tape Player
(If Equipped)
Playing the Radio
Power: Turn the VOLUME knob to turn the system
on and off.
VOLUME: Turn this knob clockwise to increase
volume. Turn it counterclockwise to decrease volume.
RECALL: Press this knob to display the station being
played or to display the clock. Clock display is available
with the ignition turned off.Finding a Station
AM
-FM: Press this knob to switch between AM,
FM1 and FM2.
TUNE: Turn this knob to tune in radio stations.
 SEEK
: Press the right or left arrow to seek
to the next or previous station and stay there.
PSCAN: To scan preset stations, press both SEEK
buttons. The radio will go to the first preset station
stored on the pushbutton, play for a few seconds,
then go on to the next preset station. Press either
SEEK button or RECALL to stop scanning through
the preset stations.
Setting Preset Stations
The four numbered pushbuttons let you return to
your favorite stations. You can set up to 21 stations
(seven AM, seven FM1 and seven FM2) by performing
the following steps:
1. Turn the radio on.
2. Press AM
-FM to select AM, FM1 or FM2.
3. Tune in the desired station.
4. Press SET. SET will appear on the display.

3-11
Playing a Cassette Tape
Your tape player is built to work best with tapes
that are up to 30 to 45 minutes long on each side.
Tapes longer than that are so thin they may not work
well in this player.
Once the tape is playing, use the VOLUME, BAL,
FADE, BASS and TREB controls just as you do for
the radio.
If an error appears on the display, see ªCassette Tape
Messagesº later in this section.
REV (Reverse): Press this button to reverse the cassette
tape. Press the FWD button to stop reversing the tape.
FWD (Forward): Press this button to advance the
cassette tape. Press the REV button to stop forwarding
the tape.
RECALL: Press this knob to switch tape sides.
EJECT: Press this button to stop a tape when it is
playing or to eject a tape when it is not playing.Cassette Tape Messages
CLN (Clean): If this message appears on the display,
the cassette tape player needs to be cleaned. It will still
play tapes, but you should clean it as soon as possible
to prevent damage to the tapes and player. See ªCare of
Your Cassette Tape Playerº in the Index.
CD Adapter Kits
It is possible to use a portable CD player adapter kit
with your cassette tape player after activating the bypass
feature on your tape player.
To activate the bypass feature, use the following steps:
1. Turn the ignition to RUN or ACCESSORY.
2. Turn the radio on.
3. Insert the adapter into the cassette slot.
4. Within five seconds, press and hold the REV
and FWD buttons at the same time for three
seconds. The tape symbol on the display will flash,
showing that the broken tape detection feature is
no longer active.
This override routine will remain active until EJECT
is pressed.

3-12 AM-FM Stereo with Cassette Tape Player
and Automatic Tone Control (If Equipped)
Playing the Radio
PWR (Power): Press this knob to turn the system
on and off.
VOL (Volume): Turn this knob clockwise to increase
volume. Turn it counterclockwise to decrease volume.
The knob is capable of being turned continuously.RECALL: Pressing this button will display the station
being played or it will display the clock. Clock display
is available with the ignition turned off.
SCV (Speed
-Compensated Volume): With SCV,
your audio system adjusts automatically to make up for
road and wind noise as you drive. Set the volume at the
desired level. Turn the control ring behind the upper
knob clockwise to adjust the SCV. Each notch on the
control ring allows for more volume compensation
at faster vehicle speeds. Then, as you drive, SCV
automatically increases the volume, as necessary, to
overcome noise at any speed. The volume level should
always sound the same to you as you drive. If you don't
want to use SCV, turn the control all the way down.
Finding a Station
AM FM: Press this button to switch between AM,
FM1 and FM2. The display will show your selection.
TUNE: Press this knob lightly so it extends. Turn it to
choose radio stations. Push the knob back into its stored
position when you're not using it.

3-15
Playing a Cassette Tape
Your tape player is built to work best with tapes
that are up to 30 to 45 minutes long on each side.
Tapes longer than that are so thin they may not work
well in this player.
To load a cassette tape with the ignition off, press
EJECT or RECALL. Then, insert the cassette tape.
If the ignition is on but the radio is off, the tape will
begin playing.
Once the tape is playing, use the VOL, AUTO TONE,
BAL, FADE, BASS and TREB controls just as you do
for the radio. The tape symbol and a direction arrow
will be on the display whenever a tape is being played.
Anytime a tape is inserted, the top side is selected for
play first.
The player automatically senses if the cassette tape is
metal or CrO
2 and adjusts for best playback sound.
If an error appears on the display, see ªCassette Tape
Messagesº later in this section.1 PREV (Previous): Press this pushbutton or the
left SEEK arrow to search for the previous selection.
A minimum three
-second blank gap is required for the
player to stop at the beginning of the selection. The tape
direction arrow will blink while in previous mode.
2 PROG (Program): Press this pushbutton to switch
from one side of the tape to the other.
3 NEXT: Press this pushbutton or the right SEEK arrow
to search for the next selection. A minimum three
-second
blank gap is required for the player to stop at the
beginning of the selection. The tape direction arrow will
blink while in next mode. The sound will mute while
searching for the next selection.
REV 4 (Reverse): Press this pushbutton to rapidly
reverse the tape. Press this pushbutton again to stop
reversing the tape. The radio will play the last selected
station while reversing the tape. The tape direction
arrow will blink while in reverse mode.

3-16

5 (Dolby): Press this pushbutton to reduce cassette
tape noise. The double
-D symbol will appear on the
display while the player is in this mode.
Dolby Noise Reduction is manufactured under a
license from Dolby Laboratories Licensing Corporation.
Dolby and the double
-D symbol are trademarks of
Dolby Laboratories Licensing Corporation.
FWD 6 (Forward): Press this pushbutton to rapidly
forward the tape. Press this pushbutton again to stop
forwarding the tape. The radio will play the last selected
station while forwarding the tape. The tape direction
arrow will blink while in forward mode.
AM FM: Press this button to listen to the radio when
playing a tape.
TAPE AUX (Auxiliary): Press this button to play a
tape when listening to the radio. The lighted arrow will
appear and show the direction of play when a tape is in
the active mode.
EJECT: Press this button to stop a tape when it is
playing or to eject a tape when it is not playing. Eject
may be activated with the radio off. Cassette tapes may
be loaded with the radio and vehicle off if this button is
pressed first.Cassette Tape Messages
CLN (Clean): If this message appears on the display,
the cassette tape player needs to be cleaned. It will still
play tapes, but you should clean it as soon as possible to
prevent damage to the tapes and player. See ªCare of
Your Cassette Tape Playerº in the Index.
CD Adapter Kits
It is possible to use a portable CD player adapter kit
with your cassette tape player after activating the bypass
feature on your tape player.
To activate the bypass feature, use the following steps:
1. Turn the ignition to RUN or ACCESSORY.
2. Turn the radio off.
3. Press and hold the TAPE AUX button for five
seconds. The tape symbol on the display will flash
for two seconds, indicating the feature is active.
4. Insert the adapter into the cassette slot. It will
power up the radio and begin playing.
This override routine will remain active until the EJECT
button is pressed.

3-17 AM-FM Stereo with Compact Disc Player
and Automatic Tone Control (If Equipped)
Playing the Radio
PWR (Power): Press this knob to turn the system on
and off.
VOL (Volume): Turn this knob clockwise to increase
volume. Turn it counterclockwise to decrease volume.
The knob is capable of rotating continuously.SCV (Speed
-Compensated Volume): With SCV,
your audio system adjusts automatically to make up for
road and wind noise as you drive. Set the volume at the
desired level. Turn the control ring behind the upper
knob clockwise to adjust the SCV. Each notch on the
control ring allows for more volume compensation
at faster vehicle speeds. Then, as you drive, SCV
automatically increases the volume, as necessary, to
overcome noise at any speed. The volume level should
always sound the same to you as you drive. If you don't
want to use SCV, turn the control all the way down.
RECALL: Pressing this button will display the station
being played or it will display the clock. Clock display
is available with the ignition turned off.
Finding a Station
AM FM: Press this button to switch between AM,
FM1 and FM2. The display will show your selection.
TUNE: Press this knob lightly so it extends. Turn it to
choose radio stations. Push the knob back into its stored
position when you're not using it.