Hummer 2006 H3 - Manual (Page 100)

When in this mode you can also choose to lock the rear
axle, if equipped, for additional traction in extreme
off-road situations. See Locking Rear Axle on page 4-10.
Indicator lights in the buttons show which mode you
are in. The indicator lights will come on briefly when
you turn on the ignition the mode the vehicle is in
will stay on. If the lights do not come on, you should
take your vehicle to your dealer for service. An indicator
light will flash while shifting the transfer case. It will
remain lit 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 SERV 4WD message stays on, you should take
your vehicle to your dealer for service. See Service
4WD message under DIC Warnings and Messages
on page 3-44.
Shifting between Four-Wheel High and
Four-Wheel-High Lock
With the vehicle traveling less than 45 mph (73 km/h),
press and release the Four-Wheel High or
Four-Wheel-High Lock button. The indicator light will
flash while shifting. It will remain lit when the shift
is complete.
It may be necessary to drive backwards while turning
for a distance of 25 feet (7.5 m) 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. 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 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. If your 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 your
transmission in gear.
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