GMC TopKick 2007 Owner's Manual page 146

Resuming a Set Speed
Suppose you set your cruise control at a desired
speed and then you apply the brake. This, of
course, shuts off the cruise control. But you don't
need to reset it.
Once you're going about 25 mph (40 km/h) or
more, you can move the cruise control switch
briefly from on to resume/accelerate.
The vehicle will return to your chosen speed and
stay there.
If you hold the switch at resume/accelerate, the
vehicle will keep going faster until you release the
switch or apply the brake. So unless you want
to go faster, don't hold the switch at
resume/accelerate.
146
Increasing Speed While Using
Cruise Control
There are two ways to go to a higher speed:
•
Use the accelerator pedal to get to the higher
speed. Press the button at the end of the
lever, then release the button and the
accelerator pedal. You'll now cruise at the
higher speed.
•
Move the cruise switch from on to resume/
accelerate. Hold it there until you get up to the
speed you want, and then release the switch.
To increase your speed in very small amounts,
move the switch briefly to resume/accelerate.
Each time you do this, your vehicle will go
about 1 mph (1.6 km/h) faster.