Hummer 2006 H3 - Manual (Page 101)

It is normal for your vehicle to have engagement noise
and bump when shifting between Four-Wheel Low
and Four-Wheel High ranges or from NEUTRAL with
the engine running.
If the Four-Wheel-Low Lock button is pressed when
your vehicle is in gear and/or moving too fast, the
Four-Wheel-Low Lock indicator light will flash 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 last chosen setting.
Shifting Out of 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 out of Four-Wheel-Low 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 ON. 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. If your vehicle has
a manual transmission, the clutch pedal must be
pressed to the floor while you press the Four-Wheel
High or Four-Wheel-High Lock button, or the shift will
not be completed. You must wait for the Four-Wheel
High or Four-Wheel-High Lock indicator light to
stop flashing 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 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
too fast, the Four-Wheel High or Four-Wheel-High
Lock indicator light will flash for 15 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).
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