2007 HUMMER H2 wheel

Full-Time Four-Wheel Drive
The transfer case on your Full-Time Four-Wheel
Drive vehicle is designed to constantly send
your engine’s driving power to all four wheels for
extra traction. To get the most out of Full-Time
Four-Wheel Drive, you must be familiar with
its operation.
Notice:Driving on pavement in Four-Wheel
High Lock or Four Wheel Low Lock for
extended periods may cause premature wear
on your vehicle’s powertrain and tires. Do
not drive in Four-Wheel High Lock or
Four-Wheel Low Lock on pavement for
extended periods.
Transfer Case Buttons
The transfer case
buttons are located to
the right of the
instrument panel cluster.
Use these switches to
shift into and out of
the different Full-Time
Four-Wheel
Drive modes.
The transfer case is a part of the Full-Time
Four-Wheel Drive system and allows the following
four different modes of operation:
4
m(Full-Time Four-Wheel Drive):This setting
is used for driving in most street and highway
situations. You can also use this setting for light or
variable off-road conditions.
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4mQ(Four-Wheel-High Lock):Use this
mode when you need extra traction in most
off-road situations such as sand, mud, snow, or
level, rocky trails.
4
nQ(Four-Wheel-Low Lock):This mode
delivers extra torque to all four wheels and is used
for extreme off-road conditions. You might
choose Four-Wheel-Low Lock if you are driving
off-road in deep sand, mud, or snow and climbing
or descending steep hills.
When in this mode you can also choose to lock
the rear axle for additional traction in extreme
off-road situations. SeeLocking Rear Axle
on page 311.
Notice:Operating your vehicle in
Four-Wheel-Low Lock above 50 mph (80 km/h)
for any extended period of time could cause
damage to the transfer case. Do not operate
your vehicle in Four-Wheel-Low Lock above
50 mph (80 km/h) for extended periods.
{CAUTION:
Shifting the transfer case to NEUTRAL
can cause your vehicle to roll even if the
transmission is in PARK (P). You or
someone else could be seriously injured.
Be sure to set the parking brake before
placing the transfer case in NEUTRAL.
SeeParking Brake on page 133.
N (NEUTRAL):Shift the vehicle’s transfer case to
NEUTRAL only when towing your vehicle. See
Recreational Vehicle Towing on page 369or
Towing Your Vehicle on page 369for more
information.
129

Indicator lights in the buttons show which mode you
are in. The indicator lights will come on briey when
you turn on the ignition and one will stay on. If the
lights do not come on, you should take your vehicle
to your dealer for service. An indicator light will ash
while shifting the transfer case. It will remain on
when the shift is complete. If for some reason the
transfer case cannot make a requested shift, it will
return to the last chosen setting.
If the SERVICE 4WD message stays on, you
should take your vehicle to your dealer for service.
See “Service 4WD message” underDriver
Information Center (DIC) on page 222.
Shifting between Four-Wheel High and
Four-Wheel-High Lock
With the vehicle traveling less than 40 mph
(64 km/h), press and release the Four-Wheel High
or Four-Wheel-Low Lock button. The indicator
light will ash while shifting. It will remain on when
the shift is complete.
It may be necessary to drive backwards for a
short distance of 25 feet (7.5 m) to get the lock
feature to disengage.
Shifting into Four-Wheel-Low Lock
To shift into Four-Wheel-Low Lock, the ignition
must be in RUN and the vehicle must be stopped or
moving less than 3 mph (5 km/h) with the
transmission in NEUTRAL (N). The preferred
method for shifting into Four-Wheel Low is to have
your vehicle moving 1 to 2 mph (1.6 to 3.2 km/h).
Press and release the Four-Wheel-Low Lock
button. You must wait for the Four-Wheel-Low Lock
indicator light to stop ashing and remain lit before
shifting your transmission in gear.
Notice:Shifting the transmission into gear
before the indicator light stops ashing could
cause damage to the transfer case. Always
wait until the indicator light stops ashing
before putting the transmission back in gear.
It is normal for your vehicle to have engagement
noise and bump when shifting between
Four-Wheel Low and Four-Wheel High or
Four-Wheel-High Lock ranges or from NEUTRAL
with the engine running.
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If the Four-Wheel-Low Lock button is pressed
when your vehicle is in gear and/or moving, the
Four-Wheel Low Lock indicator light will ash
for 15 seconds and not complete the shift unless
your vehicle is moving less than 3 mph (5 km/h)
and the transmission is in NEUTRAL (N).
After 15 seconds the transfer case will return to
the setting last chosen.
Shifting Out of Four-Wheel Low Lock
To shift from Four-Wheel-Low Lock to Four-Wheel
High or Four-Wheel-High Lock, your vehicle
must be stopped or moving less than 3 mph
(5 km/h) with the transmission in NEUTRAL (N)
and the ignition in RUN. The preferred method for
shifting out of Four-Wheel-Low Lock is to have
your vehicle moving 1 to 2 mph (1.6 to 3.2 km/h).
Press and release the Four-Wheel High or
Four-Wheel-High Lock button. You must wait for
the Four-Wheel High or Four-Wheel-High Lock
indicator light to stop ashing and remain lit before
shifting your transmission into gear.It is normal for your vehicle to have engagement
noise and bump when shifting between
Four-Wheel Low and Four-Wheel High or
Four-Wheel-High Lock ranges or from NEUTRAL
with the engine running.
If the Four-Wheel High or Four-Wheel-High Lock
button is pressed when your vehicle is in gear
and/or moving, the Four-Wheel High or
Four-Wheel-High Lock indicator light will ash for
30 seconds but will not complete the shift
unless your vehicle is moving less than 3 mph
(5 km/h) and the transmission is in NEUTRAL (N).
Notice:Shifting the transmission into gear
before the indicator light stops ashing could
cause damage to the transfer case. Always
wait until the indicator light stops ashing
before putting the transmission back in gear.
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Shifting into NEUTRAL
To shift the transfer case to NEUTRAL, do the
following:
1. Make sure the vehicle is parked so that it will
not roll.
2. Set the parking brake.
3. Start the vehicle or turn the ignition to RUN.
4. Put the transmission in NEUTRAL (N).
5. Shift the transfer case to Four-Wheel High.
6. Simultaneously press and hold the
Four-Wheel High and Four-Wheel Low Lock
buttons for 10 seconds. The NEUTRAL
light will come on when the transfer case shift
to NEUTRAL is complete.
7. If the engine is running, verify that the
transfer case is in NEUTRAL by shifting
the transmission to REVERSE (R), then shift
the transmission to DRIVE (D) and then
back to NEUTRAL (N).
8. Turn the ignition to ACCESSORY, which will
turn the engine off.
9. Place the transmission shift lever in PARK (P).
10. Turn the ignition to LOCK.
Shifting Out of NEUTRAL
To shift the transfer case out of NEUTRAL, do the
following:
1. Set the parking brake and apply the regular
brake pedal.
2. Shift the transmission to NEUTRAL (N) and
turn the ignition to RUN with the engine off.
3. Press the button for the desired transfer case
shift position (Four-Wheel High,
Four-Wheel-High Lock, or
Four-Wheel-Low Lock).
4. After the transfer case has shifted out of
NEUTRAL the red light will go out.
Notice:Shifting the transmission into gear
before the indicator light stops ashing could
cause damage to the transfer case. Always
wait until the indicator light stops ashing
before putting the transmission back in gear.
5. You may start the engine and shift the
transmission to the desired position.
132

{CAUTION:
Full-time four-wheel drive vehicles with
the transfer case in NEUTRAL will allow
the vehicle to roll, even if your shift lever
is in PARK (P). So, be sure the transfer
case is in a drive gear — not in NEUTRAL.
Always set your parking brake.
Follow the proper steps to be sure your vehicle
will not move. SeeShifting Into Park (P) on
page 134.
If you are pulling a trailer, seeTowing a Trailer on
page 374.
Mirrors
Automatic Dimming Rearview
Mirror with Compass and
Temperature Display
If your vehicle is equipped with an automatic
mirror, it will, when on, automatically dim to the
proper level to minimize glare from lights behind
you after dark.
The mirror also includes a display in the upper
right corner of the mirror face. The compass
reading and the outside temperature will both
appear in the display at the same time. The dual
display can be turned on or off by briey
pressing the compass/temperature button.
O:This is the button for the automatic dimming
and compass/temperature functions.
Your vehicle may also have a Rear Vision
Camera. SeeRear Vision Camera on page 192
for more information.
139

OnStar®Steering Wheel Controls
Your vehicle may have a Talk/Mute button that
can be used to interact with OnStar®Hands-Free
Calling. SeeAudio Steering Wheel Controls on
page 296for more information.
On some vehicles, you may have to hold the
button for a few seconds and give the command
“ONSTAR” in order to activate the OnStar
®
Hands-Free Calling feature.
On some vehicles, the mute button can be used to
dial numbers into voicemail systems, or to dial
phone extensions. See the OnStar
®Owner’s
Guide for more information.
How OnStar®Service Works
In order to provide you with OnStar®services,
your vehicle’s OnStar®system has the capability
of recording and transmitting vehicle information.
This information is automatically sent to an
OnStar
®Call Center at the time of an OnStar®
button press, Emergency button press or if
your airbags or AACN system deploys. The vehicle
information usually includes your GPS location
and, in the event of a crash, additional information
regarding the accident that your vehicle has
been involved in (e.g. the direction from which
your vehicle was hit). When you use the Virtual
Advisor feature of OnStar
®Hands-Free Calling,
your vehicle also sends OnStar®your GPS
location so that we can provide you with
location-based services.
147

Instrument Panel Overview........................ 174
Hazard Warning Flashers.......................... 176
Other Warning Devices............................. 177
Horn.......................................................... 177
Tilt Wheel.................................................. 177
Turn Signal/Multifunction Lever.................. 178
Turn and Lane-Change Signals................. 178
Headlamp High/Low-Beam Changer.......... 179
Flash-to-Pass............................................ 180
Windshield Wipers..................................... 180
Windshield Washer.................................... 181
Rear Window Wiper/Washer (SUV)........... 182
Cruise Control........................................... 183
Exterior Lamps.......................................... 186
Headlamps on Reminder........................... 188
Daytime Running Lamps (DRL)................. 188
Automatic Headlamp System..................... 189
Off-Road Lamps........................................ 190
Instrument Panel Brightness...................... 191
Dome Lamps............................................. 191
Dome Lamp Override................................ 191Entry/Exit Lighting...................................... 191
Reading Lamps......................................... 192
Battery Run-Down Protection..................... 192
Rear Vision Camera.................................. 192
Accessory Power Outlet(s)........................ 196
Ashtray(s) and Cigarette Lighter................ 197
Climate Controls......................................... 197
Dual Automatic Climate Control System....... 197
Outlet Adjustment...................................... 203
Warning Lights, Gages, and Indicators........ 204
Instrument Panel Cluster........................... 205
Speedometer and Odometer...................... 206
Trip Odometer........................................... 206
Tachometer............................................... 206
Safety Belt Reminder Light........................ 206
Airbag Readiness Light............................. 207
Airbag Off Light......................................... 208
Charging System Light.............................. 209
Voltmeter Gage......................................... 210
Brake System Warning Light..................... 211
Anti-Lock Brake System Warning Light...... 212
Section 3 Instrument Panel
171