Hummer 2005 H2 - Manual (Page 108)

All-Wheel Drive
All-wheel drive sends your engine’s driving power to all
four wheels for extra traction. To get the most out of
all-wheel drive, you must be familiar with its operation.
Notice: Driving on pavement in 4HI Lock or
4LO Lock for extended periods may cause
premature wear on your vehicle’s powertrain and
tires. Do not drive in 4HI Lock or 4LO 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 all-wheel drive
modes.
You can choose between four modes:
G
(4HI): 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.
H
(4HI Lock): Use this mode when you need extra
traction in most off-road situations such as sand, mud,
snow or level, rocky trails.
I (4LO Lock): This mode delivers extra torque to all
four wheels and is used for extreme off-road conditions.
You might choose 4LO Lock if you are driving off-road,
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.
See Locking Rear Axle on page 4-10.
Notice: Operating your vehicle in 4LO 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 4LO Lock above 50 mph
(80 km/h) for extended periods.
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