GMC 1999 Jimmy Owner's Manual page 111

You'll go right back up to your chosen speed and
stay there.
If you hold the switch at R/A longer than half a second,
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 R/A.
Once you're going about
25 mph (40 km/h) or more,
you can move the cruise
control switch from ON
to R/A for about a half
a second.
Increasing Speed While Using Cruise Control
There are two ways to go to a higher speed:
D
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.
D
Move the cruise switch from ON to R/A. 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 to R/A. Each
time you do this, your vehicle will go about 1 mph
(1.6 km/h) faster.
Reducing Speed While Using Cruise Control
D
Press in the button at the end of the lever until you
reach the lower speed you want, then release it.
D
To slow down in very small amounts, press the
button for less than half a second. Each time you do
this, you'll go 1 mph (1.6 km/h) slower.
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