Hummer 2010 H3 Owner's Manual page 231

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Notice: Operating the vehicle
in Four-Wheel-Low Lock above
48 km/h (30 mph) for any
extended period of time could
cause damage to the transfer
case. Do not operate the vehicle
in Four-Wheel-Low Lock above
48 km/h (30 mph) for extended
periods.
4
(Four-Wheel-Low Lock):
This setting delivers extra torque
to all four wheels and is used for
extreme off-road conditions.
If the vehicle has locking axles,
they can be locked for additional
traction in extreme off-road
situations. See Locking Rear Axle
on page 9 54 and Locking Front
Axle on page 9 55.
Indicator lights in the buttons show
which setting the transfer case is
in. The indicator lights will come
on briefly when the ignition is in
ON/RUN. The If the lights do not
come on, take the vehicle to your
dealer for service. An indicator light
will flash while shifting the transfer
case. If the transfer case cannot
make a requested shift, it will return
to the last chosen setting.
If the SERV 4WD message on the
Driver Information Center (DIC)
stays on, take the vehicle to your
dealer for service. See Service 4WD
message under Driver Information
Center (DIC) on page 5 18.
Shifting between Four-Wheel High
and Four-Wheel-High Lock
With the vehicle traveling less than
120 km/h (75 mph), press and
release the Four-Wheel High or
Four-Wheel-High Lock button.
It may be necessary to drive
backwards while turning for a
distance of 7.5 m (25 feet) to get
the lock feature to disengage.
Shifting into Four-Wheel Low Lock
Notice: Shifting the transmission
into gear before the indicator
light stops flashing could cause
damage to the transfer case.
Driving and Operating
Always wait until the indicator
light stops flashing before putting
the transmission back in gear.
To shift into Four-Wheel-Low Lock,
the ignition must be in ON/RUN and
the vehicle must be stopped or
moving less than 5 km/h (3 mph)
with the transmission in N (Neutral).
The preferred method for shifting
into Four-Wheel Low is to have
the vehicle moving 1.6 to 3.2 km/h
(1 to 2 mph). Press and release
the Four-Wheel-Low Lock button.
If the vehicle has a manual
transmission, the clutch pedal must
be pressed to the floor while you
press the Four-Wheel-Low Lock
button, or the shift will not be
completed. You must wait for the
Four-Wheel-Low Lock indicator light
to stop flashing and remain lit before
shifting the transmission into gear.
It is normal for the vehicle to have
engagement noise and bump when
shifting between Four-Wheel Low
and Four-Wheel High ranges or
from Neutral.
9-47

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