GMC Yukon Denalid Owner's Manual page 201

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(On/Off): This button can both activate and
turn off the system. The indicator light is on
when cruise control is on and turns off when cruise
control is off.
+ RES (Resume/Accelerate): Press this button
to make the vehicle accelerate or resume to
a previously set speed.
SET − (Set/Coast): Press this button to set the
speed or make the vehicle decelerate.
[
(Cancel): Press this button to cancel cruise
control without erasing the set speed from
memory.
Setting Cruise Control
Cruise control will not work if your parking brake is
set, or if the master cylinder brake fluid level is low.
The cruise control light on the instrument panel
cluster will come on after the cruise control
has been set to the desired speed.
CAUTION:
{
If you leave your cruise control on when
you are not using cruise, you might hit a
button and go into cruise when you do
not want to. You could be startled and
even lose control. Keep the cruise control
switch off until you want to use cruise
control.
1. Press the cruise control On/Off button.
2. Get up to the desired speed you want.
3. Press the SET− button located on the steering
wheel and release it.
4. Take your foot off the accelerator.
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