GMC 2012 Sierra Denali Owner's Manual page 290

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If the cruise button is on when not in
use, it could get bumped and go into
cruise when not desired. Keep the
cruise control switch off when cruise
is not being used.
The cruise control light on the
instrument panel cluster comes on
after the cruise control has been set
to the desired speed.
1. Press
.
2. Get up to the desired speed.
3. Press the SET button.
4. Take your foot off the
accelerator.
If the cruise control is set at a
desired speed and then the brakes
are applied, the cruise control is
disengaged without erasing the set
speed from memory.
Once the vehicle speed reaches
about 40 km/h (25 mph) or more,
press the +RES button on the
steering wheel. The vehicle returns
to the previous set speed and stays
there.
If the cruise control system is
already activated,
Press and hold the +RES button
on the steering wheel until the
desired speed is reached, then
release it.
To increase vehicle speed in
small amounts, press the +RES
button. Each time this is done,
the vehicle goes about 1.6 km/h
(1 mph) faster.

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