roof HUMMER H3 2008 User Guide

Front Seat Storage Net
Your vehicle has storage nets located on the back of
the front seats. To remove these nets, pull out on each
of the four clips located on the net.
Front Armrest Storage Area
Your vehicle has a front armrest storage area. To open,
lift the latch on the front of the armrest and pull up.
Luggage Carrier
If your vehicle has this feature, you can load cargo on
your vehicle.
The luggage carrier consists of siderails attached to
the roof. The crossrails attach into the siderails and
can be moved back and forth to accommodate various
cargo sizes.
Notice:Loading cargo on the luggage carrier
that weighs more than 250 lbs. (113 kg) or hangs
over the rear or sides of the vehicle may damage
your vehicle. Load cargo only on top of the
crossrails and tie the cargo down to the crossrail
support cargo tie-down loops, making sure to
fasten it securelyDo not exceed the maximum vehicle capacity when
loading your vehicle. For more information on vehicle
capacity and loading, seeLoading Your Vehicle
on page 4-42.
Adjusting the Crossrails
To adjust the crossrails to t your load:
1. Use the provided crossrail key to unlock the
crossrail end cap by turning it counterclockwise.
2-57

Stop Tabs
If your vehicle has a sunroof, it will have a crossrail stop
tab placed in the siderail. This tab prevents you from
moving the crossrails past the opening of the sunroof
and loading cargo too far forward.
Your vehicle may have cargo tie downs. Once you
load the cargo onto the crossrails, secure it by tying it
down to the cargo tie downs. Do not load cargo directly
on the roof of your vehicle. SeeCargo Tie Downs on
page 2-59for more information.
Rear Storage Area
Your vehicle has a rear storage area located on
the passenger’s side of the cargo area. To open,
pull the two tabs out and open lid.
Convenience Net
Your vehicle may have a convenience net in the rear
of the vehicle. Put small loads behind the net. The net
is not for heavier loads. Store them as far forward
as you can.
Cargo Cover
Notice:If you put items onto the cargo cover, the
weight of the items could cause the attachment clips
to break. You would no longer be able to attach
and use the cargo cover. The repairs would not be
covered by your warranty. Never put anything
on top of the cargo cover.
If your vehicle has a cargo cover, you can use it to
cover items in the rear of the vehicle. Remove the
cover from its pouch and place the loops found on
each corner of the cover, over the two pegs in each
corner of the rear if the vehicle. When it is not in
use, fold up the cover and return it to the pouch.
Cargo Tie Downs
Your vehicle may have four cargo tie-downs. These
tie-downs are located in tracks on the roof of the vehicle.
Each tie-down can be moved to anywhere on the
track. To loosen, turn the tie-down counterclockwise
until it moves freely in the track. To tighten, turn
the tie-down clockwise.
2-59

Sunroof
To operate a power sliding sunroof, the ignition must be
on, or Retained Accessory Power (RAP) must be active.
SeeRetained Accessory Power (RAP) on page 2-20.
The switch used to
operate the sunroof is
located in the headliner.
Open/Close:Press and release the back of the switch
to fully open the sunroof. If the sunshade is in the
closed position, it automatically opens with the sunroof.
To stop the sunroof before it reaches the full open
position press and release the front or back of the switch.
An air deector raises when the sunroof is fully opened.
Press the front of the switch to close the sunroof.Vent:With the sunroof closed, press and hold the front
of the switch to vent the sunroof. To stop the sunroof
before it reaches its full vent position, release the switch.
Press and hold the back of the switch to close.
Do not keep the sunroof open for long periods of time.
Debris may collect in the tracks.
Sunshade Operation
The sunshade automatically opens with the sunroof,
but can be manually pulled shut after the sunroof
is closed.
To adjust the sunshade, push it backward or pull it
forward to the desired position. The sunshade cannot
be adjusted further than the current closed position
of the sunroof.
2-60

Daytime Running Lamps (DRL)
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the
day. DRL can be helpful in many different driving
conditions, but they can be especially helpful in the short
periods after dawn and before sunset. Fully functional
daytime running lamps are required on all vehicles
rst sold in Canada.
The DRL system will come on when the following
conditions are met:
The ignition is on.
The exterior lamps control is in AUTO.
The transmission is not in PARK (P) if you have an
automatic transmission.
The light sensor determines it is daytime.
When the DRL are on, no other lamps are on. The
instrument panel will not be lit up either. For vehicles rst
sold in Canada, if parking lamps are manually turned
on, DRL will stay on.
When it begins to get dark, the automatic headlamp
system will switch from DRL to the headlamps.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
To turn off the DRL, seeExterior Lamps on page 3-15.Vehicles rst sold in Canada cannot turn off DRL unless
certain conditions are met. SeeExterior Lamps on
page 3-15.
Automatic Headlamp System
When it is dark enough outside, the automatic headlamp
system will turn on after the transmission has been
shifted from PARK (P) to DRIVE (D). The headlamps,
taillamps, sidemarker, parking lamps, roof marker lamps,
and the instrument panel lights will turn on at normal
brightness. The radio lights will become more dim when
the headlights are off compared to when the headlights
are on.
Your vehicle has a light sensor located on the top of the
instrument panel. Be sure it is not covered, or the
system will be on whenever the ignition is on.
The system may also turn on the headlamps when
driving through a parking garage, heavy overcast
weather, or a tunnel. This is normal.
There is a delay in the transition between the daytime
and nighttime operation of the Daytime Running
Lamps (DRL) and the automatic headlamp system so
that driving under bridges or bright overhead street lights
does not affect the system. The DRL and automatic
headlamp system will only be affected when the
light sensor detects a change in lighting lasting longer
than the delay.
3-17

If you start your vehicle in a dark garage, the automatic
headlamp system will come on immediately. Once
you leave the garage, it will take about one minute for
the automatic headlamp system to change to DRL if it is
light outside. During that delay, the instrument panel
cluster may not be as bright as usual. Make sure
the instrument panel brightness control is in the full
bright position. SeeInstrument Panel Brightness
on page 3-19.
Off-Road Lamps
The off-road lamps, if the vehicle has them, provide
auxiliary lighting when the vehicle is used off road.
These lamps are not intended to be used in place of
existing vehicle lighting. The lamps are not to be used
on any public street or highway and are to be covered
when not in use. Check your state and local laws before
installing or using any auxiliary lighting. In some
states it may be necessary to remove the roof lamps
when operating the vehicle on the highway.The switches for the off-road lamps are located in the
center of the instrument panel below the climate
controls. One switch is used for the front lower-grille
mounted off-road lamps, if the vehicle has them, and the
other switch is used for the roof-mounted off-road
lamps, if the vehicle has them.
To use the lamps, remove the covers from the lamps and
press the switch to turn them on or off. An indicator light
on the switch will turn on when the lamps are on.
Notice:Turning on the off-road lamps before
removing the lamp covers could damage the
off-road lamps and the covers. Always remove the
covers before turning on the off-road lamps.
The off-road lamps remain on even after the ignition is
turned off. The off-road lamp switch must be pressed
to turn them off.Roof Mounted Off-Road
Light Switch
Lower Grille Off-Road
Light Switch
3-18

AM
The range for most AM stations is greater than for FM,
especially at night. The longer range can cause station
frequencies to interfere with each other. For better radio
reception, most AM radio stations boost the power levels
during the day, and then reduce these levels during the
night. Static can also occur when things like storms and
power lines interfere with radio reception. When this
happens, try reducing the treble on your radio.
FM Stereo
FM stereo gives the best sound, but FM signals reach
only about 10 to 40 miles (16 to 65 km). Tall buildings or
hills can interfere with FM signals, causing the sound
to fade in and out.
XM™ Satellite Radio Service
XM™ Satellite Radio Service gives digital radio
reception from coast-to-coast in the 48 contiguous
United States, and in Canada. Just as with FM,
tall buildings or hills can interfere with satellite radio
signals, causing the sound to fade in and out. In
addition, traveling or standing under heavy foliage,
bridges, garages, or tunnels may cause loss of the XM™
signal for a period of time. The radio may display NO
SIGNAL to indicate interference.
Fixed Mast Antenna
The xed mast antenna can withstand most car washes
without being damaged. If the mast should ever
become slightly bent, straighten it out by hand. If the
mast is badly bent, replace it.
Check occasionally to make sure the mast is still
tightened to its base. If tightening is required, tighten
by hand, then with a wrench one quarter turn.
XM™ Satellite Radio Antenna
System
The XM™ Satellite Radio antenna is located on the roof
of your vehicle. Keep this antenna clear of snow and
ice build up for clear radio reception.
If your vehicle has a sunroof, the performance of the
XM™ system may be affected if the sunroof is open.
Loading items onto the roof of your vehicle can interfere
with the performance of the XM™ system. Make sure
the XM™ Satellite Radio antenna is not obstructed.
3-62

Loading Your Vehicle for
Off-Road Driving
{CAUTION:
Cargo on the load oor piled higher than
the seatbacks can be thrown forward during
a sudden stop. You or your passengers
could be injured. Keep cargo below the
top of the seatbacks.
Unsecured cargo on the load oor can be
tossed about when driving over rough
terrain. You or your passengers can be
struck by ying objects. Secure the cargo
properly.
Heavy loads on the roof raise the vehicle’s
center of gravity, making it more likely to
roll over. You can be seriously or fatally
injured if the vehicle rolls over. Put heavy
loads inside the cargo area, not on the roof.
Keep cargo in the cargo area as far forward
and low as possible.There are some important things to remember about
how to load your vehicle.
The heaviest things should be on the load oor and
forward of your rear axle. Put heavier items in the
rear area, as far forward as you can.
Be sure the load is secured properly, so driving on
the off-road terrain does not toss things around.
You will nd other important information in this manual.
SeeLoading Your Vehicle on page 4-42andTires
on page 5-54.
4-13

Fuse Usage
1 Heated Seats
2 Grille Guard
3 Fuel PumpFuse Usage
4 Roof Lamp
5 Battery Ignition Switch
6 Front Wiper
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Fuse Usage
7 Regulated Voltage Control Power
8 Power Locks
9 Sunroof, Front Washer Pump
10 Accessories (SPO)
11 Air Compressor
12 Transfer Case Control Module
13Radio, Heating, Ventilation, Air
Conditioning Display
14 Body Control Module
15 Rear Wiper Motor
16 Rear Wiper Pump Switch
17 Air Injection Reactor (AIR) Solenoid
18 Spare 6
19 Cluster
20 Rear Turn Signal, Hazard Signal
21 Powertrain Control Module 1
22Mass Air Flow Sensor, Purge
Solenoid
23 Injector
24 Fog Lamp
25 Powertrain Control Module B
26 Transmission Control Module (TCM)
27 Airbags
28 Back-up LampsFuse Usage
29 Antilock Brakes, StabiliTrak®
30 Rear Window Defogger
31 Canister Vent
32 Regulated Voltage Control VSense+
33 Ignition 1
34 Transmission
35 Cruise, Inside Rearview Mirror
36 Horn
37 Driver Side Rear Park Lamp
38 Amplier
39Reduced Intensity Low-Beam
Daytime Running Lamps
40 Passenger Side Headlamp
41 Driver Side Headlamp
42 Trailer Back-Up Lamp
43 Front Park Lamps
44 Air Injection Reactor (AIR) Solenoid
45 Auxiliary Power 2
46 Electronic Throttle Control
47 Oxygen Sensor
48 Air Conditioning Clutch
49 Passenger Side Rear Park Lamp
50 Spare
51 Auxiliary Power 1
5-105

Fuse Usage
52 StabiliTrak®, Antilock Brakes
53 Power Heater Switch
54 Stop
55 Trailer Parking Lamps
56 Front Turn Signal, Hazard Signal
57 Power Sunroof
58Transfer Case Control Module
Switch
59 Climate Control
60 Spare 8
61 Power Seats
62 Air Pump
63 Passenger Side Power Window
64Antilock Brakes, StabiliTrak
®2
Solenoid
67Antilock Brakes, StabiliTrak
®1
Motor
68 Driver Side Power Window
82 Climate Control Fan
83 Electronic Brake Controller
84 Trailer B+ Fuse
85 Starter
91 Megafuse
Relay Usage
66 Fuel Pump
69 Fog Lamp
70 High, Low Beam Headlamps
71 Rear Defogger
72 Windshield Wiper On/Off
73 Windshield Wiper High/Low
74 Horn
75 Headlamp
76 Air Conditioning Clutch
77 Powertrain Control Module
78 Run, Crank
79Reduced Intensity Low-Beam
Daytime Running Lamps
80 Air Injection Reactor (AIR) Solenoid
81 Powertrain (Starter)
86 Spare 2
87 Heating, Ventilation, Air Conditioning
88 Retained Accessory Power
89 Park Lamp
Diode Usage
65 Wiper Diode
90 Air Conditioning Clutch Diode
5-106