GMC 2004 Yukon XL Owner's Manual page 127

You can choose among three driving settings:
d
®
(Stabilitrak ): This button is used with the
®
Stabilitrak system and is also used to shift the transfer
case into Neutral (N). For more information on using
®
Stabilitrak see Stabilitrak
f
(All-Wheel Drive): This setting delivers power to
all four wheels as needed depending on road and driving
conditions.
g
(4LO): This setting delivers extra torque. 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 2-36.
®
System on page 4-11.
NEUTRAL: Shift the vehicle's transfer case to
NEUTRAL only when towing your vehicle. See
Recreational Vehicle Towing on page 4-53 or Towing
Your Vehicle on page 4-53 for more information.
Indicator lights in the buttons show which setting 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 under Driver Information Center (DIC)
on page 3-56.
2-33