GMC 2009 Sierra - Manual (Page 149)

Resuming a Set Speed
If you apply the brakes while the cruise control is set,
the cruise control is disengaged. But it does not need to
be reset.
Once the vehicle speed reaches about 25 mph (40 km/h)
or more, press the +RES button on the steering wheel.
The vehicle will go back to the previous set speed and
stay there.
Increasing Speed While Using Cruise
Control
To increase the cruise speed while using cruise control:
• Press and hold the +RES button on the steering
wheel until you reach your new desired speed,
then release it.
• To increase vehicle speed in small increments,
press the +RES button. Each time this is done,
the vehicle will go about 1 mph (1.6 km/h) faster.
Reducing Speed While Using Cruise
Control
To reduce the vehicle speed while using cruise control:
• Press and hold the SET– button on the steering
wheel until the desired lower speed is reached,
then release it.
• To slow down in very small amounts, press the
SET– button on the steering wheel briefly. Each
time this is done, the vehicle will go about 1 mph
(1.6 km/h) slower.
Passing Another Vehicle While Using
Cruise Control
Use the accelerator pedal to increase the vehicle speed.
When you take your foot off the pedal, the vehicle will
slow down to the previous set cruise speed.
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