2004 GMC SONOMA turn signal bulb

To signal a lane change, just raise or lower the lever
until the arrow starts to flash. Hold it there until you
complete your lane change. The lever will return by itself
when you release it.
As you signal a turn or a lane change, if the arrows
flash more quickly than normal, a signal bulb may
be burned out and other drivers won’t see your turn
signal.
If a bulb is burned out, replace it to help avoid an
accident. If the arrows don’t go on at all when you signal
a turn, check the fuse. SeeFuses and Circuit Breakers
on page 5-95and for burned-out bulbs.
If you have a trailer towing option with added wiring for
the trailer lamps, a different turn signal flasher is
used. With this flasher installed, the signal indicator will
flash even if a turn signal bulb is burned out. Check
the front and rear turn signal lamps regularly to make
sure they are working.
Turn Signal On Chime
If your turn signal is left on for more than 3/4 of a mile
(1.2 km), a chime will sound at each flash of the
turn signal. To turn off the chime, move the turn signal
lever to the off position.
Headlamp High/Low-Beam Changer
To change the headlamps from low beam to high or high
to low, pull the multifunction lever all the way toward
you. Then release it.
When the high beams are
on, this indicator light on
the instrument panel
cluster will also be on.
Flash-to-Pass Feature
This feature lets you use your high-beam headlamps to
signal a driver in front of you that you want to pass.
It works even if your headlamps are in the automatic
position.
To use it, pull the turn signal lever toward you, but not
so far that you hear a click.
If your headlamps are in the automatic position or on
low beam, your high-beam headlamps will turn on.
They’ll stay on as long as you hold the lever toward you
and the high-beam indicator on the instrument panel
cluster will come on. Release the lever to return
to normal operation.
3-7

When towing a trailer, the arrows on your instrument
panel will flash for turns even if the bulbs on the trailer
are burned out. Thus, you may think drivers behind
you are seeing your signal when they are not. It’s
important to check occasionally to be sure the trailer
bulbs are still working.
Driving On Grades
Reduce speed and shift to a lower gear before you start
down a long or steep downgrade. If you don’t shift
down, you might have to use your brakes so much that
they would get hot and no longer work well.
You should use THIRD (3) when towing a trailer.
Operating your vehicle in THIRD (3) when towing a
trailer will minimize heat buildup and extend the life of
your transmission.
When towing at high altitude on steep uphill grades,
consider the following: Engine coolant will boil at a lower
temperature than at normal altitudes. If you turn your
engine off immediately after towing at high altitude
on steep uphill grades, your vehicle may show signs
similar to engine overheating. To avoid this, let the
engine run while parked (preferably on level ground)
with the automatic transmission in PARK (P) (or
the manual transmission out of gear and the parking
brake applied) for a few minutes before turning the
engine off. If you do get the overheat warning,
seeEngine Overheating on page 5-26.
Parking on Hills
{CAUTION:
You really should not park your vehicle, with a
trailer attached, on a hill. If something goes
wrong, your rig could start to move. People
can be injured, and both your vehicle and the
trailer can be damaged.
But if you ever have to park your rig on a hill, here’s
how to do it:
1. Apply your regular brakes, but don’t shift into
PARK (P) yet, or into gear for a manual
transmission. When parking uphill, turn your wheels
away from the curb. When parking downhill, turn
your wheels into the curb.
2. Have someone place chocks under the
trailer wheels.
3. When the wheel chocks are in place, release the
regular brakes until the chocks absorb the load.
4-62

Service............................................................5-3
Doing Your Own Service Work.........................5-3
Adding Equipment to the Outside of
Your Vehicle..............................................5-4
Fuel................................................................5-4
Gasoline Octane............................................5-4
Gasoline Specifications....................................5-5
California Fuel...............................................5-5
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-6
Filling Your Tank............................................5-7
Filling a Portable Fuel Container.......................5-9
Checking Things Under
the Hood....................................................5-10
Hood Release..............................................5-10
Engine Compartment Overview.......................5-12
Engine Oil...................................................5-13
Engine Air Cleaner/Filter................................5-18
Automatic Transmission Fluid.........................5-19
Engine Coolant.............................................5-23
Radiator Pressure Cap..................................5-26
Engine Overheating.......................................5-26
Cooling System............................................5-28
Engine Fan Noise.........................................5-35
Power Steering Fluid.....................................5-35Windshield Washer Fluid................................5-36
Brakes........................................................5-37
Battery........................................................5-40
Jump Starting...............................................5-41
Rear Axle.......................................................5-46
Four-Wheel Drive............................................5-46
Front Axle......................................................5-47
Bulb Replacement..........................................5-48
Halogen Bulbs..............................................5-48
Headlamps..................................................5-49
One-Piece Front Turn Signal Lamps................5-51
Two-Piece Front Turn Signal Lamps................5-51
Center High-Mounted Stoplamp (CHMSL).........5-52
Taillamps.....................................................5-53
Replacement Bulbs.......................................5-54
Windshield Wiper Blade Replacement..............5-54
Tires..............................................................5-57
Inflation - Tire Pressure.................................5-67
Tire Inspection and Rotation...........................5-68
When It Is Time for New Tires.......................5-69
Buying New Tires.........................................5-70
Uniform Tire Quality Grading..........................5-71
Wheel Alignment and Tire Balance..................5-72
Wheel Replacement......................................5-72
Section 5 Service and Appearance Care
5-1

One-Piece Front Turn Signal Lamps
1. Remove the headlamp assembly as shown in
“One-Piece Composite Headlamp System”
underHeadlamps on page 5-49.
2. Twist the bulb socket
counterclockwise to
remove it from
the headlamp
assembly.
3. Pull the bulb straight out to remove it from the
socket.
4. Push the new bulb into the socket until it snaps
into place.
5. Put the bulb socket into the lamp assembly and
twist it clockwise until it is tight.
6. Put the headlamp assembly back into the vehicle.
7. Install the two retaining clips.
8. Close the hood.
Two-Piece Front Turn Signal Lamps
1. Remove the headlamp assembly as shown in
“Two–Piece Composite Headlamp System”
underHeadlamps on page 5-49.
2. Locate the locking tabs
on the assembly.
Squeeze the tabs
together and push that
end of the assembly
out while holding
the tabs. The assembly
will swing out.
3. Unplug the electrical connector.
5-51

Replacement Bulbs
Exterior Lamp Bulb Number
Halogen Headlamps
Composite Low-Beam
Composite High-Beam9006 HB4 or
9006 LL
9005 HB3
Tail and Stoplamps 3057
Rear Sidemarker Lamps 194
Front Sidemarker Lamps 194NA
Front Turn Signal Lamps 3457A
Center High–Mounted Stoplamp 211–2
*For replacement bulbs not listed here, please
consult your dealer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected at least
twice a year for wear and cracking. See “Wiper
Blade Check” underAt Least Twice a Year on
page 6-26.
Replacement blades come in different types and are
removed in different ways. For proper type and length,
seeNormal Maintenance Replacement Parts on
page 6-34.
Notice:Allowing the wiper blade arm to touch the
windshield when no wiper blade is installed
could damage the windshield. Any damage that
occurs would not be covered by your warranty. Do
not allow the wiper blade arm to touch the
windshield.
1. To remove the old wiper blades, lift the wiper arm
until it locks into a vertical position.
5-54

Audio System(s) (cont.)
Fixed Mast Antenna.....................................3-76
Radio with Cassette and CD.........................3-49
Radio with CD............................................3-39
Radio with Six-Disc CD................................3-59
Setting the Time for Radios with Radio
Data Systems (RDS)................................3-36
Setting the Time for Radios without Radio
Data Systems (RDS)................................3-35
Theft-Deterrent Feature................................3-73
Understanding Radio Reception.....................3-74
XM™ Satellite Radio Antenna System............3-76
Automatic Headlamp System............................3-12
Automatic Transmission
Fluid..........................................................5-19
Operation...................................................2-20
Automatic Transmission Check..........................6-26
Automatic Transmission Shift Lock Control
System Check.............................................6-28
B
Backing Up....................................................4-61
Battery..........................................................5-40
Battery Replacement......................................... 2-6Battery Rundown Protection.............................3-16
Bed Rails......................................................2-41
Before Leaving on a Long Trip.........................4-34
Before You Go Off-Roading..............................4-14
Body Lubrication Service..................................6-27
Brake
Parking......................................................2-25
System Inspection.......................................6-31
System Warning Light..................................3-27
Brake Adjustment............................................5-40
Brake Fluid....................................................5-37
Brake Pedal Travel.........................................5-39
Brake Wear...................................................5-39
Brakes..........................................................5-37
Braking........................................................... 4-6
Braking in Emergencies..................................... 4-8
Break-In, New Vehicle.....................................2-16
Bulb Replacement...........................................5-48
Center High-Mounted Stoplamp (CHMSL)........5-52
Halogen Bulbs............................................5-48
Headlamps.................................................5-49
One-Piece Front Turn Signal Lamps...............5-51
Replacement Bulbs......................................5-54
Taillamps....................................................5-53
Two-Piece Front Turn Signal Lamps...............5-51
Buying New Tires...........................................5-70
2

Gasoline
Octane........................................................ 5-4
Specifications............................................... 5-5
Getting Familiar with Off-Road Driving................4-16
Glove Box.....................................................2-33
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
H
Hazard Warning Flashers................................... 3-4
Head Restraints............................................... 1-6
Headlamp High/Low-Beam Changer.................... 3-7
Headlamps....................................................5-49
Bulb Replacement.......................................5-48
Electrical System.........................................5-95
Halogen Bulbs............................................5-48
One-Piece Front Turn Signal Lamps...............5-51
Two-Piece Front Turn Signal Lamps...............5-51
Heated Seats................................................... 1-4
Highway Hypnosis...........................................4-35
Hill and Mountain Roads..................................4-36
Hitches..........................................................4-59
Hood
Checking Things Under................................5-10
Release.....................................................5-10
Horn............................................................... 3-5
How to Add Automatic
Transmission Fluid.......................................5-22How to Add Coolant to the Coolant
Recovery Tank............................................5-30
How to Add Coolant to the Radiator..................5-32
How to Check................................................5-67
How to Check Lubricant..........................5-46, 5-47
How to Check Power Steering Fluid..................5-36
How to Check the Automatic
Transmission Fluid.......................................5-20
How to Inspect the Engine Air Cleaner/Filter.......5-18
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-13
Hydroplaning..................................................4-31
I
If No Steam Is Coming From Your Engine..........5-27
If Steam Is Coming From Your Engine...............5-26
If the Light Is Flashing.....................................3-30
If the Light Is On Steady.................................3-30
If You Are Caught in a Blizzard.........................4-40
If You Are Stuck in Sand, Mud, Ice or Snow.......4-42
If You Do Decide To Pull A Trailer.....................4-56
Ignition Positions.............................................2-17
Ignition Transmission Lock Check......................6-28
Infants and Young Children, Restraints...............1-29
Inflation - Tire Pressure...................................5-67
Inspection
Brake System.............................................6-31
Engine Cooling System................................6-30
7