Hummer 2005 H2 - Manual (Page 109)

{ 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. See Parking Brake on
page 2-36.
N (NEUTRAL): Shift the vehicle’s transfer case to
NEUTRAL only when towing your vehicle. See
Recreational Vehicle Towing on page 4-64 or Towing
Your Vehicle on page 4-64 for more information.
Indicator lights in the buttons show which mode you are
in. The indicator lights will come on briefly 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 flash while
shifting the transfer case. It will remain illuminated 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” under Driver Information Center (DIC)
on page 3-43.
Shifting into 4HI or 4HI Lock
With the vehicle traveling less than 40 mph (64 km/h),
press and release the 4HI or 4HI 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 for a short
distance of 25 feet (7.5 m) to get the lock feature
to disengage.
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