GMC 2005 Automobile User Manual


 
f (All-Wheel Drive): This button allows the transfer
case to distribute power to all four wheels as needed
depending on road and driving conditions.
g (4LO): This button allows the transfer case to
delivers extra torque to the wheels, and provides for
precise control of wheel speed by engine braking. You
may never need this setting. It sends maximum
power to all four wheels. You might choose 4LO if you
are driving off-road in deep sand, deep mud, deep
snow and climbing or descending steep hills.
{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 2-33.
N (Neutral): Shift the vehicle’s transfer case to
NEUTRAL only when towing your vehicle. See
Recreational Vehicle Towing on page 4-57 or Towing
Your Vehicle on page 4-57 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 the
transfer case is shifting. 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 under Driver Information Center (DIC)
on page 3-52.
Shifting Into 4LO
To shift to the 4LO position, the ignition must be in RUN
and the vehicle must be stopped or moving less than
3 mph (4.8 km/h) with the transmission in NEUTRAL (N).
Press and release the 4LO switch. You must wait for
the 4LO indicator light to stop flashing and remain
illuminated before shifting your transmission in gear.
Notice: Shifting the transmission into gear before
the 4LO indicator light has stopped flashing
could damage the transfer case. To help avoid
damaging your vehicle, always wait for the
4LO indicator light to stop flashing before shifting
the transmission into gear.
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