GMC 2010 Sierra Owner's Manual page 182

Shifting In or Out of Neutral
1. With the vehicle running and the engine at an idle
set the parking brake.
2. Place the transmission into N (Neutral).
Shift the transfer case in one continuous motion into or
out of the N (Neutral) position.
Electronic Transfer Case
Use the dial to shift into and out of four-wheel drive.
3-44
The transfer case knob is
located next to the
steering column.
Recommended Transfer Case Settings
Driving Conditions
Normal
Severe
Extreme
Vehicle in Tow*
*See Recreational Vehicle Towing on page 5 49 or
Towing Your Vehicle on page 5 48
You can choose among four driving settings:
Indicator lights in the dial 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 the vehicle to your dealer for
service. An indicator light flashes while shifting the
transfer case and remains 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.
Transfer Case Settings
2 4 4
YES
YES
YES
N
YES