2007 HUMMER H2 air suspension
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SERVICE 4WD (Full-Time
Four-Wheel Drive)
This message displays if a problem occurs with
the Full-Time Four-Wheel Drive system.
If this message appears, stop as soon as possible
and turn off the vehicle. Restart the vehicle and
check for the message on the DIC display. If
the message is still displayed, or appears again
when you begin driving, there is a problem with the
Full-Time Four-Wheel Drive system. See your
dealer for service. Press any of the DIC buttons,
or the trip stem, to acknowledge this message and
clear it from the DIC display.
SERVICE AIR BAG
This message displays if there is a problem with
the airbag system. Have your dealer inspect
the system for problems. Press any of the DIC
buttons, or the trip stem, to acknowledge this
message and clear it from the DIC display. See
Airbag Readiness Light on page 207and
Airbag System on page 77for more information.
SERVICE AIR SUSPENSION
This message displays if a problem occurs with
the suspension system. If this message appears,
stop as soon as possible and turn off the
vehicle. Restart the vehicle and check for the
message on the DIC display. If the message is still
displayed, or appears again when you begin
driving, there is a problem with the air suspension
system. See your dealer for service.
SERVICE BRAKE SYSTEM
This message displays if a problem occurs with
the brake system. If this message appears, stop as
soon as possible and turn off the vehicle. Restart
the vehicle and check for the message on the
DIC display. If the message is still displayed, or
appears again when you begin driving, there
is a problem with the brake system. See your
dealer for service. Press any of the DIC buttons,
or the trip stem, to acknowledge this message and
clear it from the DIC display.
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Your Driving, the Road, and
Your Vehicle............................................ 302
Defensive Driving...................................... 302
Drunken Driving........................................ 303
Control of a Vehicle.................................. 306
Braking...................................................... 306
Anti-Lock Brake System (ABS).................. 307
Braking in Emergencies............................. 309
Traction Control System (TCS).................. 309
Locking Rear Axle..................................... 311
Steering.................................................... 312
Off-Road Recovery.................................... 314
Passing..................................................... 314
Loss of Control.......................................... 316
Off-Road Driving........................................ 317
Assist Steps.............................................. 338
Driving at Night......................................... 342
Driving in Rain and on Wet Roads............ 344
City Driving............................................... 347
Freeway Driving........................................ 348Before Leaving on a Long Trip.................. 349
Highway Hypnosis..................................... 350
Hill and Mountain Roads........................... 351
Winter Driving........................................... 353
If Your Vehicle is Stuck in Sand, Mud,
Ice, or Snow.......................................... 357
Rocking Your Vehicle to Get It Out........... 358
Recovery Loops........................................ 358
First Aid Kit and Tool Kit........................... 360
Front Mounted Receiver............................ 360
Power Winch Platform............................... 361
Loading Your Vehicle................................ 362
Towing........................................................ 369
Towing Your Vehicle ................................. 369
Recreational Vehicle Towing...................... 369
Selectable Extended Rear Ride Height...... 371
Electronically Controlled Air Suspension
System.................................................. 372
Towing a Trailer........................................ 374
Trailer Recommendations.......................... 388
Section 4 Driving Your Vehicle
301
Page 371 of 570
Selectable Extended Rear Ride
Height
If your vehicle has this feature it comes as part
of the electronically controlled air suspension
system.
The selectable rear ride height allows you to raise
the rear of the vehicle about 2 inches (5 cm)
over the normal ride height. This can be helpful
when driving off-road where you may need
more ground clearance to clear an obstacle.
The button that controls
this feature is located
on the instrument panel
to the right of the
steering wheel.To use this feature, ensure that the following
conditions are met:
The engine must be running.
All doors must be fully closed. The suspension
will not raise or lower if a door is open.
The vehicle speed must be less than 40 mph
(64 km/h). The system will not activate
otherwise.
Press the height control button to raise the rear of
the vehicle.
A light in the button will begin to ash as the rear
of the vehicle rises. Once the extended height
has been reached (this may take up to a minute),
the warning light will stop ashing and will stay
lit while the vehicle is at the extended height.
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Page 372 of 570
To lower the vehicle to the normal ride height,
press the button again. The light in the button will
ash as the suspension lowers. When the light
in the button stops ashing and goes out,
the suspension has reached the normal ride
height.
This feature will lower the vehicle to the normal
height if vehicle speed exceeds 40 mph (64 km/h).
You may also want to use this feature when
ascending, descending or cresting a steep hill as
this can help prevent the rear bumper from
dragging on the base of the hill or prevent the
vehicle from grounding out (high centering) on the
crest of the hill.
Do not use this feature when towing a trailer.Electronically Controlled Air
Suspension System
The electronically controlled air suspension, if
equipped, keeps the rear of your vehicle level as
you load and unload it. The system includes a
compressor, two height sensor and two air springs
supporting the vehicle.
The engine must be running for the system to
level the vehicle after loading or unloading.
The system will suspend transitioning between
the designed ride height and the extended
ride height if any of the doors are open. However,
the system will not suspend operation during
normal leveling and once the doors are closed,
system leveling will continue.
You may hear the compressor running when you
load your vehicle, and periodically as the system
adjusts the vehicle to the standard ride height.
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You may also hear the release of air similar to a
hissing sound during suspension operation.
This is normal.
Load leveling will not function normally with the
in ator hose attached to the in ator outlet.
Remove the in ater hose from the outlet when
it is not in use. SeeAccessory In ator on
page 466.
Overload and Overheat Protection
Overload protection is designed to protect the air
suspension system and is an indication to the
driver that the vehicle is overloaded.
If the rear suspension remains at a low height, the
rear axle load has exceeded GAWR (Gross Axle
Weight Rating). When the overload protection
mode is activated, the compressor operates forabout 30 seconds to one minute without raising the
vehicle depending on the amount of overload.
This will continue each time the ignition is turned on
until the rear axle load is reduced below GAWR.
If the total rear GAWR (Gross Axle Weight Rating)
is reached, the suspension may be slightly less
than level. This is normal and does not mean there
is a problem with the air suspension.
If the system overheats due to normal operation,
the SERVICE AIR SUSPENSION message
will not be displayed on the DIC, but the system
will shut down and stop all leveling functions until it
cools down. If the system overheats and sets
the SERVICE AIR SUSPENSION message in the
DIC, then there is a fault. SeeDIC Warnings
and Messages on page 226for more information.
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Page 467 of 570
The accessory in ator hose also has a built-in
air pressure gage. As soon as you start to
in ate an object it will automatically read the
current pressure.
4. Press and release the switch to turn the
accessory in ator on. The indicator light
will remain on while the in ator is running.When you are nished using the in ator, press and
release the switch to turn it off. Place the in ator kit
tools and the hose back in the pouch.
If your vehicle is equipped with the air suspension
system, load leveling will not function with the
in ator hose attached to the in ator outlet.
{CAUTION:
In ating something too much can make it
explode, and you or others could be
injured. Be sure to read the in ator
instructions, and in ate any object only to
its recommended pressure.
467
Page 505 of 570
Fuses Usage
RR Wiper Rear Window Wiper Switch
SEO ACCYSpecial Equipment Option
Accessory
WS WPR Windshield Wipers
TBC ACCYTruck Body Controller
Accessory
IGN 3 Rear Heated Seats Module
Fuses Usage
4WDFour-Wheel Drive Switch, Air
Suspension Switch/Module
HTR A/C Not Used
LOCKPower Door Lock Relay
(Lock Function)
HVAC 1Inside Rearview Mirror,
Climate Control System
L DOORDriver’s Door Harness
Connection
CRUISE Cruise Control
UNLOCKPower Door Lock Relay
(Unlock Function)
RR FOG LP Not Used
BRAKE Brake Switch
DRIVER UNLOCKPower Door Lock Relay
(Driver’s Door Unlock
Function)
IGN 0Brake Transmission Shift
Interlock, Powertrain Control
Module, Transmission
TBC IGN 0 Truck Body Controller
VEH CHMSLVehicle and Trailer High
Mounted Stoplamp
LT TRLR ST/TRN Left Turn Signal/Stop Trailer
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*1— Gasoline Engine and Fuel Injection Rail #2.
*2— Gasoline Engine and Fuel Injection Rail
#1.
*3— Gasoline Engine; Oxygen Sensors.
*4— Gasoline Engine; Oxygen Sensors.
*5— Ignition 1
*6— Powertrain Control Module, Fuel Pump.
*7— Supplemental Brake Assist.
*8— Sunroof.
Fuses Usage
GLOW PLUG Not Used
CUST FEED Gasoline Accessory Power
HYBRID Not Used
WSW/HTRHeated Windshield Washer
(Special Edition Only)
STUD #1Accessory Power/Trailer
Wiring
MBEC 1Mid Bussed Electrical Center
Power Feed, Front Seats,
Right Doors
Fuses Usage
BLWR Front Climate Control Fan
LBEC 2Left Bussed Electrical Center,
Door Modules, Door Locks,
Auxiliary Power Outlet—Rear
Cargo Area and Instrument
Panel
STUD #2*Accessory Power/Trailer
Wiring Brake Feed
ABS Anti-lock Brakes
VSES/ECASElectronically Controlled Air
Suspension
IGN A Ignition Switch
IGN B Ignition Switch
LBEC 1Left Bussed Electrical Center,
Left Doors, Truck Body
Controller, Flasher Module
TRL PARK Parking Lamps Trailer Wiring
RR PARKPassenger’s Side Rear
Parking and Sidemarker
Lamps
LR PARKDriver’s Side Rear Parking
and Sidemarker Lamps
509