GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 197

With cruise control, a speed of about 25 mph (40 km/h)
or more can be maintained without keeping your foot
on the accelerator. Cruise control does not work
at speeds below about 25 mph (40 km/h).
When the brakes are applied, cruise control is
turned off.
For vehicles with an Allison
automatic transmission, see "Grade Braking and Cruise
Grade Braking (Allison Transmission) under Tow/Haul
Mode on page 2-34 for an explanation of how cruise
control interacts with the Range Selection Mode, tow/haul
and grade braking systems.
For vehicles with the StabiliTrak
to limit wheel spin while you are using cruise control,
the cruise control will automatically disengage. See
®
StabiliTrak System on page 4-6. When road conditions
allow the cruise control to be safely used again, it can be
turned back on.
®
or Hydra-Matic 6-speed
®
system that begins
T
(On/Off): Turns the system on or off. The indicator
light is on when cruise control is on and turns off
when cruise control is off.
+ RES (Resume/Accelerate): Press to make the
vehicle accelerate or resume to a previously set speed.
SET − (Set/Coast): Press to set the speed or make
the vehicle decelerate.
[
(Cancel): Press to cancel cruise control without
erasing the set speed from memory.
The cruise control buttons
are located on left side of
the steering wheel.
3-13