Chevrolet Suburban 2007 Owner's Manual page 150

Indicator lights in the button will come on to 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 on 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 4 WHEEL DRIVE message stays
on, you should take your vehicle to your dealer for
service. See "SERVICE 4 WHEEL DRIVE"
message under DIC Warnings and Messages on
page 266.
Shifting Into Four-Wheel Drive High or
AUTO (Automatic Four-Wheel Drive)
Turn the knob to the Four-Wheel High or AUTO
position. This can be done at any speed,
except when shifting from Four-Wheel Drive Low.
The indicator light will flash while shifting. It will
remain on when the shift is completed.
Shifting Into Two-Wheel Drive High
Turn the knob to the Two-Wheel High position.
This can be done at any speed, except when
shifting from Four-Wheel Drive Low.
150
Shifting Into Four-Wheel Drive Low
This vehicle is limited to 45 mph (72 km/h) while
driving in Four-Wheel Drive Low. This feature will
protect the drivetrain during extended high speed
operation in Four-Wheel Drive Low.
To shift to the Four-Wheel Drive Low position, the
ignition must be in RUN 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).
Turn the knob to the Four-Wheel Drive Low
position. You must wait for the Four-Wheel Drive
Low indicator light to stop flashing and remain on
before shifting your transmission in gear.
Notice: Shifting the transmission into gear
before the Four-Wheel Low indicator light has
stopped flashing could damage the transfer
case. To help avoid damaging your vehicle,
always wait for the Four-Wheel Low indicator
light to stop flashing before shifting the
transmission into gear.