ignition HUMMER H3 2008 Service Manual

FLUID
This message displays if the brake uid is low. Check
the brake uid as soon as possible and have your
vehicle serviced by your dealer/retailer. SeeBrakes on
page 5-38for more information. Press and release
the reset stem to acknowledge the message and clear it
from the display.
FUEL CAP
This message displays if the vehicle’s fuel cap is either
off or loose. Pull over as soon as possible and check
to see if the fuel cap is secure. You may also see
the check engine light on the instrument panel cluster.
If the check engine light does come on when the
fuel cap was loose, it may take a few driving trips before
the light turns off. SeeMalfunction Indicator Lamp on
page 3-36for more information if the light still remains
on. Press and release the reset stem to acknowledge
the message and clear it from the display.
LOW FUEL
This message displays if the level of fuel in the vehicle
is low. Also check the fuel gage. SeeFuel Gage on
page 3-40for more information. Rell the fuel tank as
soon as possible.
LOW TIRE
This message displays if a low tire pressure is detected
in any of the vehicle’s tires. Press and release the reset
stem to acknowledge the message and clear it from the
display. The message appears at each ignition cycle until
the tires are inated to the correct ination pressure. See
Tires on page 5-54andInflation - Tire Pressure on
page 5-62for more information on tires and the correct
ination pressures.
OIL
This message displays when the oil pressure is low.
SeeOil Pressure Light on page 3-38andEngine Oil
on page 5-15for more information.
PARK BRK (Brake)
This message displays when the parking brake is set.
SeeParking Brake on page 2-32andBrake System
Warning Light on page 3-33for more information. The
message clears from the display after the parking brake
is released or by pressing and releasing the reset stem.
3-45

REDUCED POWER
This message displays when the vehicle’s engine power
is reduced. Reduced engine power can affect the
vehicle’s ability to accelerate. If this message is on, but
there is no reduction in performance, proceed to
your destination. The performance may be reduced the
next time the vehicle is driven. The vehicle may be
driven at a reduced speed while this message is on, but
acceleration and speed may be reduced. Anytime this
message stays on, the vehicle should be taken to
your dealer/retailer for service as soon as possible.
Press and release the reset stem to acknowledge the
message and clear it from the display.
SERV (Service) 4WD (Four-Wheel
Drive)
This message displays when there is a problem with the
transfer case control system. Check the transfer case
on your vehicle and have it serviced by your
dealer/retailer. SeeFull-Time Four-Wheel Drive on
page 2-27for more information about the transfer case.
Press and release the reset stem to acknowledge
the message and clear it from the display.
SERV (Service) TPM (Tire Pressure
Monitor)
This message displays if a part on the Tire Pressure
Monitor System (TPMS) is not working properly. The tire
pressure light also ashes and then remains on during
the same ignition cycle. SeeTire Pressure Light on
page 3-35. Several conditions may cause this message
to appear. SeeTire Pressure Monitor Operation on
page 5-65for more information. If the warning comes on
and stays on, there may be a problem with the TPMS.
See your dealer/retailer.
SERV (Service) VEH (Vehicle)
This message displays if your vehicle needs service.
Have your vehicle serviced by your dealer/retailer
as soon as possible.
3-46

Audio System(s)
Determine which radio your vehicle has and then read
the pages following to familiarize yourself with its
features.
{CAUTION:
This system provides you with far greater
access to audio stations and song listings.
Giving extended attention to entertainment
tasks while driving can cause a crash and you
or others can be injured or killed. Always keep
your eyes on the road and your mind on the
drive — avoid engaging in extended searching
while driving.
Keeping your mind on the drive is important for safe
driving. SeeDefensive Driving on page 4-2. Here
are some ways in which you can help avoid distraction
while driving.
While your vehicle is parked:
Familiarize yourself with all of its controls.
Familiarize yourself with its operation.
Set up your audio system by presetting your
favorite radio stations, setting the tone, and
adjusting the speakers. Then, when driving
conditions permit, you can tune to your favorite
radio stations using the presets and steering wheel
controls if the vehicle has them.
Notice:Before adding any sound equipment to
your vehicle, such as an audio system, CD player,
CB radio, mobile telephone, or two-way radio, make
sure that it can be added by checking with your
dealer/retailer. Also, check federal rules covering
mobile radio and telephone units. If sound
equipment can be added, it is 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.
Your vehicle has a feature called Retained Accessory
Power (RAP). With RAP, the audio system can be
played even after the ignition is turned off. SeeRetained
Accessory Power (RAP) on page 2-20for more
information.
Setting the Time
Press and hold H until the correct hour and AM or PM
displays. Press and hold M until the correct minute
displays. The time can be set with the ignition on or off.
3-48

Playing the Radio
P
(Power/Volume):Press to turn the system on
and off.
Turn clockwise or counterclockwise to increase or to
decrease the volume.
DISP (Display):Press to switch the display between
the radio station frequency and the time. When the
ignition is turned off, press to display the time.
For XM™ (if equipped), press the DISP button while in
XM™ mode to retrieve four different categories of
information related to the current song or channel: Artist,
Song Title, Category or PTY (program type), Channel
Number/Channel Name.
To change the default on the display, press the DISP
button until you see the desired display, then hold
this knob for two seconds. The radio produces one beep
and the selected display becomes the default.
AUTO VOL (Automatic Volume):With automatic
volume, the audio system adjusts automatically to make
up for road and wind noise as you drive.
Set the volume at the desired level. Press to select
LOW, MEDIUM, or HIGH. Each higher setting allows for
more volume compensation at faster vehicle speeds.
Then as you drive, automatic volume increases
the volume, as necessary, to overcome noise at anyspeed. The volume level should always sound the same
to you as you drive. NONE displays if the radio cannot
determine the vehicle speed. To turn automatic
volume off, press until AVOL OFF displays.
Finding a Station
BAND:Press to switch between FM1, FM2, AM, or
XM1 or XM2 (if equipped). The selection displays.
e(Tune):Turn to select radio stations.
tSEEKu:Press and release the arrows to go to
the next or to the previous station and stay there.
To scan stations, press and hold either arrow for more
than two seconds. SCN or SCAN displays and the
radio produces one beep. The radio goes to a station,
plays for a few seconds, then goes to the next
station. Press either arrow again or one of the
pushbuttons to stop scanning presets.
To scan preset stations, press and hold either arrow for
more than four seconds. PSC or PSCN displays and
the radio produces two beeps. The radio goes to
a preset station, plays for a few seconds, then goes to
the next preset station. Press either arrow again or
one of the pushbuttons to stop scanning presets.
The radio only seeks and scans stations with a strong
signal that are in the selected band.
3-50

XM™ Satellite Radio Service
XM™ is a satellite radio service that is based in the
48 contiguous United States and 10 Canadian provinces.
XM™ Satellite Radio has a wide variety of programming
and commercial-free music, coast-to-coast, and in
digital-quality sound. During your trial or when you
subscribe, you will get unlimited access to XM™ Radio
Online for when you are not in your vehicle. A service
fee is required to receive the XM™ service. For more
information, contact XM™ at www.xmradio.com or call
1-800-929-2100 in the U.S. and www.xmradio.ca or call
1-877-438-9677 in Canada.
Radio Messages for XM™ Only
SeeXM Radio Messages on page 3-60later in this
section for further detail.
Playing a CD
Insert a CD partway into the slot, label side up. The
player pulls it in and the CD should begin playing. If you
want to insert a CD with the ignition off, rst press the
Z(eject) button or the DISP knob.
If the ignition or radio is turned off with a CD in the
player it stays in the player. When the ignition or radio
is turned on, the CD starts to play where it stopped, if it
was the last selected audio source.When the CD is inserted, the CD symbol displays. As
each new track starts to play, the track number displays.
The CD player can play the smaller 3 inch (8 cm)
single CDs with an adapter ring. Full-size CDs and the
smaller CDs are loaded in the same manner.
Care of Your CDs
If playing a CD-R, the sound quality can be reduced
due to CD-R quality, the method of recording, the quality
of the music that has been recorded, and the way the
CD-R has been handled. Handle them carefully.
Store CD-R(s) in their original cases or other protective
cases and away from direct sunlight and dust. The
CD player scans the bottom surface of the disc. If the
surface of a CD is damaged, such as cracked, broken,
or scratched, the CD does not play properly or not
at all. Do not touch the bottom side of a CD while
handling it; this could damage the surface. Pick up CDs
by grasping the outer edges or the edge of the hole
and the outer edge.
If the surface of a CD is soiled, take a soft, lint free cloth
or dampen a clean, soft cloth in a mild, neutral detergent
solution mixed with water, and clean it. Make sure the
wiping process starts from the center to the edge.
3-54

Care of Your CD Player
Do not add any label to a CD, it could get caught in the
CD player. If a CD is recorded on a personal computer
and a description label is needed, try labeling the top of
the recorded CD with a marking pen.
The use of CD lens cleaners for CDs is not advised,
due to the risk of contaminating the lens of the CD optics
with lubricants internal to the CD player mechanism.
Notice:If a label is added to a CD, or more than one
CD is inserted into the slot at a time, or an attempt
is made to play scratched or damaged CDs, the
CD player could be damaged. While using the CD
player, use only CDs in good condition without any
label, load one CD at a time, and keep the CD
player and the loading slot free of foreign materials,
liquids, and debris.
If an error displays, see “CD Messages” later in this
section.
For vehicles that have a radio with a Six-Disc CD
player, see the following:
LOAD:Press to load CDs into the CD player. This CD
player holds up to six CDs.
To insert one CD, do the following:
1. Turn the ignition on.
2. Press and release the LOAD button.3. Wait for the indicator light, located to the right of the
slot, to turn green.
4. Load a CD. Insert the CD partway into the slot,
label side up. The player pulls the CD in.
To insert multiple CDs, do the following:
1. Turn the ignition on.
2. Press and hold the LOAD button for two seconds.
A beep sounds and the indicator light, located to the
right of the slot, begins to ash and LOAD # displays.
3. Once the light stops ashing and turns green,
INSERT CD # displays, load a CD. Insert the
CD partway into the slot, label side up. The player
pulls the CD in.
Once the CD is loaded, the indicator light begins
ashing again. Once the light stops ashing
and turns green, you can load another CD.
The CD player takes up to six CDs.
To load more than one CD but less than six, complete
Steps 1 through 3. When nished loading CDs,
press the LOAD button to cancel the loading function.
The radio begins to play the last CD loaded.
If more than one CD has been loaded, a number for
each CD displays.
3-55

Playing a Specic Loaded CD
For every CD loaded, a number displays. To play a
specic CD, rst press the CD button, then press the
numbered pushbutton that corresponds to the CD.
A small bar appears under the CD number that
is playing and the track number displays.
If an error displays, see “CD Messages” later in this
section.
Z(Eject):Press to eject CD(s).
To eject the CD that is currently playing, press and
release this button.
To eject multiple CDs, do the following:
1. Press and hold for ve seconds.
A beep sounds and the indicator light, located to
the right of the slot, begins to ash and EJECT
ALL displays.
2. Once the light stops ashing and turns green,
REMOVE CD # displays. The CD ejects and
can be removed.
Once the CD is removed, the indicator light begins
ashing again and another CD ejects.
To stop ejecting the CDs, press the LOAD or the
eject button.If the CD is not removed, after 25 seconds, the CD
automatically pulls back into the player. If CD is pushed
back into the player, before the 25 second time period
is complete, the player senses an error and tries to eject
the CD several times before stopping.
Do not repeatedly press the CD eject button to eject a
CD after you have tried to push it in manually. The
player’s 25-second eject timer resets at each press of
the eject button, causing the player to not eject the
CD until the 25-second time period has elapsed.
Z(Eject) (Radio with Single CD):Press to eject a
CD. Eject can be activated with either the ignition or
radio off. CDs can be loaded with the ignition and radio
off if this button is pressed rst.
1
r(Previous) (Radio with Single CD):Press to go
to the start of the current track if more than eight seconds
have played. The previous symbol and the track number
displays. If this button is held or pressed more than once,
the player continues moving backward through the CD.
r(Reverse) (Radio with Six-Disc CD Player):Press
to reverse within the track.
2
[(Next) (Radio with Single CD):Press to go to the
next track. The next symbol and the track number
displays. If this button is held or pressed more than once,
the player continues moving forward through the CD.
3-56

When this message is on, the system will not limit
wheel spin. Adjust your driving accordingly.
The traction control system automatically comes on
whenever you start your vehicle. To limit wheel
spin, especially in slippery road conditions, you should
always leave the system on. But you can turn the
traction control system off if you ever need to.
To turn the system off,
press and hold the TCS
button for ve seconds.
This light will come
on steady when the
traction control system
has been turned off.
This light ashes when
TCS is active.If you press and hold the TC button for ve seconds,
the traction control system will turn off and a TRAC OFF
message will appear on the DIC. Press the TC button
again to turn the system back on. The TRAC OFF
message will then go off. The traction control system
will reset itself at each ignition cycle.
Adding non-dealer/non-retailer accessories can affect
your vehicle’s performance. SeeAccessories and
Modifications on page 5-3for more information.
Locking Rear Axle
Your vehicle may have this feature. The locking rear axle
can give your vehicle additional traction from the rear
wheels when traveling in off-road situations such as mud,
snow, sand, steep hills and uneven terrain.
The button used to turn
this feature on or off is
located to the right of
the transfer case buttons
on the center of the
instrument panel.
4-6

If the water is not too deep, drive slowly through it.
At faster speeds, water splashes on your ignition system
and your vehicle can stall. Stalling can also occur if
you get your tailpipe under water. And, as long as
your tailpipe is under water, you will never be able
to start your engine. When you go through water,
remember that when your brakes get wet, it may
take you longer to stop.
SeeDriving in Rain and on Wet Roads on page 4-33for
more information on driving through water.
After Off-Road Driving
Remove any brush or debris that has collected on
the underbody, chassis, or under the hood. These
accumulations can be a re hazard.
After operation in mud or sand, have the brake linings
cleaned and checked. These substances can cause
glazing and uneven braking. Check the engine and
oil coolers and underbody skid shields for mud
accumulation. Thoroughly and carefully clean these
devices to allow proper cooling. Check the bodystructure, steering, suspension, underbody shields,
wheels, tires, and exhaust system for damage. Also,
check the fuel lines and cooling system for any leakage.
Your vehicle will require more frequent service due
to off-road use. See the Maintenance Schedule
for additional information.
Assist Steps
If your vehicle has removable side steps, remove the
steps prior to off-roading to give your vehicle more ground
clearance and to prevent damage to the vehicle from the
side steps dragging and/or catching on obstacles.
Notice:Do not drive off-road with the side steps
attached to your vehicle. You can damage the
side steps and/or your vehicle’s frame if they get
caught or drag against an obstacle. This damage
would not be covered by your vehicle’s warranty.
Always remove the side steps prior to any off-road
driving.
4-31

{CAUTION:
If you do not shift down, the brakes could get
so hot that they would not work well. You
would then have poor braking or even none
going down a hill. You could crash. Shift down
to let the engine assist the brakes on a steep
downhill slope.
{CAUTION:
Coasting downhill in NEUTRAL (N) or with the
ignition off is dangerous. The brakes will have
to do all the work of slowing down and they
could get so hot that they would not work well.
You would then have poor braking or even
none going down a hill. You could crash.
Always have the engine running and your
vehicle in gear when you go downhill.
Stay in your own lane. Do not swing wide or cut
across the center of the road. Drive at speeds
that let you stay in your own lane.
Top of hills: Be alert — something could be in your
lane (stalled car, accident).
Pay attention to special road signs (falling rocks
area, winding roads, long grades, passing or
no-passing zones) and take appropriate action.
SeeOff-Road Driving on page 4-12for information
about driving off-road.
Winter Driving
Here are some tips for winter driving:
Have your vehicle in good shape for winter.
You might want to put winter emergency supplies in
your vehicle.
Include an ice scraper, a small brush or broom,
a supply of windshield washer uid, a rag, some
winter outer clothing, a small shovel, a ashlight, a
red cloth, and a couple of reective warning triangles.
And, if you will be driving under severe conditions,
include a small bag of sand, a piece of old carpet,
or a couple of burlap bags to help provide traction.
Be sure you properly secure these items in your vehicle.
Also seeTires on page 5-54.
4-35