GMC SONOMA 2002 Owner's Manual

2-81 Service Four-Wheel-Drive Warning Light
This light should come on
briefly when you turn on the
ignition, as a check to show
you it is working.
The SERVICE 4WD light comes on to indicate that
there may be a problem with the four
-wheel 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.
Check Gages Light
If this 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.

2-82 Fuel Gage
United States Canada
When the ignition is on, the fuel gage tells you about
how much fuel you have remaining.Here are four things that some owners ask about. None
of these show a problem with your fuel gage:

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

It takes a little more or less fuel to fill up than the
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.

2-83 Low Fuel Light
This light comes on briefly
when you start your engine.
This light comes on when the fuel tank is low on fuel.
To turn it off, add fuel to the fuel tank. See ªFuelº in
the Index.
Driver Information Center (DIC) (If Equipped)
This system displays the outside air temperature,
compass direction and trip information in the
overhead console.
US/MET (United States/Metric): The US/MET
(United States/metric) button allows you to switch the
display between the English and metric system.
MODE: The MODE button can be used to toggle
between three modes of operation: OFF, COMP/TEMP
and TRIP.COMP/TEMP (Compass/Temperature): The
display provides the outside temperature and one of
eight compass readings to indicate the direction the
vehicle is facing.
Before you turn on the ignition and move the vehicle,
the temperature indicated will be the last outside
temperature recorded with the ignition on. If the outside
temperature is 37
F (3
C) or lower, the display will
toggle between the word ICE and the current
temperature every eight seconds. This is a warning to
the driver that road conditions may be icy, and that
appropriate precautions should be taken.
The compass is self
-calibrating, so it does not need to be
manually set. However, if ªCº (Calibration) is
displayed, the compass will need to be calibrated. You
may also place the compass in a noncalibrated mode by
pressing and holding the MODE and US/MET buttons
simultaneously while in the COMP/TEMP mode. After
about 10 seconds, the compass will display C and you
can release the buttons. Drive the vehicle in a complete
360
circle three times at a speed of less than 5 mph
(8 km/h), and the compass will function normally. Once
the calibration is complete, the display will return to a
compass reading.

2-84
Variance is the difference between magnetic north and
geographic north. In some areas, the difference between
the two can be great enough to cause false compass
readings. If this happens, follow these instructions to set
the variance for your particular location:
1. Find your location on the zone map earlier in this
section. Record your zone number.
2. Press and hold both the MODE and the US/MET
buttons in the COMP/TEMP mode.
3. After five seconds, the compass will acknowledge
the variation mode by displaying the current zone
number. When it does, release both buttons.
4. Press US/MET until your zone number appears on
the display.
5. Press MODE to enter your zone number. Your
variance is now set and the display will return to the
COMP/TEMP mode.TRIP: Once in the TRIP mode, pressing the
MODE button will step you through the following
TRIP functions:

AVG ECON (Average Economy): The average fuel
economy since the last reset is displayed.

INST ECON (Instantaneous Economy):
Instantaneous fuel economy for the last second of
driving is displayed.

RANGE: The display indicates the estimated
distance that can be travelled with the remaining fuel
in the tank, based on the fuel economy for the last
few hours of driving.

FUEL USED: The fuel used since the last reset is
displayed.

AVG SPEED (Average Speed): The average speed
since the last reset is displayed.
To reset the trip computer, press the MODE and
US/MET buttons simultaneously for at least two
seconds. All functions will be displayed briefly once the
system is reset. Reset can only be performed in the AVG
ECON, FUEL USED and AVG SPEED modes. All three
modes are reset simultaneously.

3-
3-1
Section 3 Comfort Controls and Audio Systems
In this section, you'll find out how to operate the comfort control and audio systems offered with your vehicle.
Be sure to read about the particular systems supplied with your vehicle.
3
-2 Comfort Controls
3-2 Standard Climate Control System
3-3 Optional Climate Control System
3-5 Air Conditioning (If Equipped)
3-5 Heating
3-6 Defogging and Defrosting
3-6 Ventilation System
3-7 Audio Systems
3-7 Setting the Clock for Systems with
SET Button
3
-7 Setting the Clock for Systems with HR and
MN Buttons
3
-8 Setting the Clock for Systems with Radio
Data System (RDS)
3
-8AM-FM Stereo
3-10 AM-FM Stereo
3-13 AM-FM Stereo with Cassette Tape Player
(If Equipped)
3
-16 AM-FM Stereo with Cassette Tape Player and
Automatic Tone Control (If Equipped)
3
-21 AM-FM Stereo with Compact Disc Player and
Automatic Tone Control (If Equipped)3
-26 AM-FM Stereo with Compact Disc Player
with Radio Data System (RDS) and Automatic
Tone Control (If Equipped)
3
-34 AM-FM Stereo with Cassette Tape and
Compact Disc Player with Radio Data System
(RDS) and Automatic Tone Control
(If Equipped)
3
-44 AM-FM Stereo with Six-Disc Compact Disc
Player with Programmable Equalization and
Radio Data System (RDS) (If Equipped)
3
-56 Remote Cassette Tape Player (If Equipped)
3-58 Theft-Deterrent Feature (If Equipped)
3-60 Theft-Deterrent Feature RDS Radios
(If Equipped)
3
-60 Understanding Radio Reception
3-61 Tips About Your Audio System
3-62 Care of Your Cassette Tape Player
3-63 Care of Your Remote Cassette Tape Player
3-64 Care of Your Compact Discs
3-64 Care of Your Compact Disc Player
3-64 Fixed Mast Antenna

3-2
Comfort Controls
With these systems, you can control the heating, cooling
and ventilation in your vehicle.
Standard Climate Control System
Fan Control
The knob on the left side of the climate control system
panel is used to adjust the fan speed. To increase airflow,
turn the knob clockwise. To decrease airflow, turn it
counterclockwise.
Temperature Knob
The middle knob on the control panel lets you select the
relative temperature of the air flowing into the passenger
area of your vehicle. Turn the knob clockwise toward
the red area for warmer air. Turn the knob
counterclockwise toward the blue area for cooler air.

3-3
Mode Knob
The right knob on the control panel allows you to
choose the direction of air delivery.
OFF: This setting turns the system off. Some outside air
will still enter the vehicle whenever the vehicle is
moving forward. If the air entering your vehicle is
warmer than desired, turn the temperature knob fully
counterclockwise and turn the mode knob to vent mode.
(Vent): This setting directs most of the air through
the instrument panel outlets and a small amount through
the floor outlets.
(Bi-Level): Air is delivered through the floor
outlets as well as the instrument panel outlets.
(Floor): This setting directs most of the air
through the floor outlets and some air through the
windshield defroster outlets.
(Blend): Airflow is divided equally between the
floor outlet and the windshield defroster outlets.
(DEFROST): This setting directs most air through
the windshield defroster outlets and some through the
floor outlets.
Optional Climate Control System
Fan Control
The knob on the left side of the climate control system
panel operates the fan speed. To increase airflow, turn
the knob clockwise. To decrease airflow, turn it
counterclockwise.

3-4
Temperature Knob
The middle knob on the control panel lets you select the
relative temperature of the air flowing into the passenger
area of your vehicle. Turn the knob clockwise toward
the red area for warmer air. Turn the knob
counterclockwise toward the blue area for cooler air.
Mode Knob
The right knob on the control panel allows you to
choose the direction of air delivery and settings for
air conditioning.
OFF: This setting turns the system off. Some outside air
will still enter the vehicle whenever the vehicle is
moving forward.
MAX A/C (Maximum Air Conditioning): This setting
provides maximum cooling with the least amount of
work. MAX A/C recirculates much of the air inside your
vehicle so it cools quickly. This setting directs most of
the air through the instrument panel vents and a small
amount through the floor vents.A/C (Air Conditioning): This setting cools the air
entering your vehicle and directs most of the air through
the instrument panel vents and a small amount through
the floor vents.
(Bi-Level): This setting cools the air entering your
vehicle and directs it through the heater floor outlets as
well as the instrument panel outlets.
(Vent): This setting directs most of the air through
the instrument panel outlets and a small amount through
the floor outlets. The air conditioning compressor is not
working when the other modes are selected.
(Floor): This setting directs most of the air
through the floor outlets and some air through the
windshield defroster outlets.
(Blend): Airflow is divided equally between the
floor outlet and the windshield defroster outlets.
(Defrost): This setting directs most air through
the windshield defroster outlets and some through the
floor outlets.

3-5 Air Conditioning (If Equipped)
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for your
vehicle to cool down. Then keep your windows closed
for the air conditioner to work its best.
For quick cool
-down on very hot days, use MAX A/C
with the temperature knob turned counterclockwise.
This setting should be used to keep odors and/or dust
from entering the vehicle. For normal cooling on hot
days, use A/C with the temperature knob turned
counterclockwise.
On cool but sunny days, use bi
-level to deliver warm
air to the floor and cooler air to the instrument
panel outlets.
If you have the VORTEC 4300 V6 engine, when the air
conditioner is on, you may sometimes notice slight
changes in your vehicle's engine speed and power. This
is normal because the system is designed to cycle the
compressor on and off to keep the desired temperature.
Heating
The heater works best if you keep your windows closed
while using it. On cold days, use the floor outlets with
the temperature knob turned clockwise. Blend is useful
in cool weather when you have fog or ice on the
windshield or side windows.
If you use the optional engine coolant heater before
starting your engine, your heating system will produce
warmer air faster to heat the passenger compartment in
cold weather. See ªEngine Coolant Heaterº in the Index.

3-6 Defogging and Defrosting
On cool, humid days, use blend to keep the windshield
and side windows clear.
Use defrost to remove fog or ice from the windshield
quickly in extreme humid or cold conditions. Turn the
temperature knob clockwise and turn the fan control
toward high.
If you have the heated outside mirror feature, you can
use it to defog or defrost your outside mirrors. For more
information, see ªHeated Outside Mirrorsº in the Index.
Ventilation System
Your vehicle's ventilation system supplies outside air to
the inside of your vehicle when it is moving. When the
vehicle is not moving, you can get outside air to flow
through by selecting any mode and any fan speed.
You will find air outlets in the center and on the sides of
your instrument panel.
You can direct the airflow side
-to-side by moving the
thumbwheel located in the center of the vent. The vent
can be tilted up and down also. To control the amount of
airflow through the outlets, move the thumbwheel below
the vent.