lock GMC SONOMA 2002 Service Manual

2-62
To use the lighter, press it in all the way, and let go.
When it's ready, it will pop back out by itself.
NOTICE:
Don't hold a cigarette lighter in with your hand
while it is heating. If you do, it won't be able to
back away from the heating element when it's
ready. That can make it overload, damaging the
lighter and the heating element.
Sun Visors
To block out glare, you can swing down the sun visor.
You can also swing the visor from side to side.
Accessory Power Outlets
With accessory power outlets you can plug in auxiliary
electrical equipment such as a cellular telephone or CB
radio.
There are two accessory power outlets located near the
center of the vehicle on the lower part of the instrument
panel. A small cap must be pulled down to access an
accessory power outlet. When not using an outlet be
sure to cover it with the protective cap.
NOTICE:
When using accessory power outlets:

Maximum load of any electrical equipment
should not exceed 20 amps.

Be sure to turn off any electrical equipment
when not in use. Leaving electrical
equipment on for extended periods can
drain the battery.

2-75 Anti-Lock Brake System Warning Light
With the anti-lock brake
system, this light will come
on when you start your
engine and may stay on
for several seconds.
That's normal.
If the light stays on, or comes on when you're driving,
your vehicle needs service. If the regular brake system
warning light isn't on, you still have brakes, but you
don't have anti
-lock brakes. If the regular brake system
warning light is also on, you don't have anti
-lock brakes
and there's a problem with your regular brakes. See
ªBrake System Warning Lightº earlier in this section.
The anti
-lock brake system warning light should come
on briefly when you turn the ignition key to RUN. If the
light doesn't come on then, have it fixed so it will be
ready to warn you if there is a problem.
Engine Coolant Temperature Gage
United States Canada
This gage shows the engine coolant temperature. If the
gage pointer moves into the red area, your engine is
too hot!
It means that your engine coolant has overheated. If you
have been operating your vehicle under normal driving
conditions, you should pull off the road, stop your
vehicle and turn off the engine as soon as possible. See
ªEngine Overheatingº in the Index.

2-80
CAUTION:
Don't keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches fire. You or others could be burned.
Check your oil as soon as possible and have
your vehicle serviced.
NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
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.
Security Light
This light will come on
briefly when you turn the
key toward START. The
light will stay on until the
engine starts.
If the light flashes, the Passlock

system has entered a
tamper mode. If the vehicle fails to start, see ªPasslockº
in the Index.
If the light comes on continuously while driving and
stays on, there may be a problem with the Passlock
system. Your vehicle will not be protected by Passlock,
and you should see your dealer.
Also see ªContent Theft
-Deterrentº in the Index for
additional information regarding the SECURITY light.

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.

3-7
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 control to high for a few moments before driving
off. 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.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 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.