Cadillac CTS Owner's Manual page 220

Once the vehicle speed reaches
about 40 km/h (25 mph) or more,
press the +RES up to the first
detent briefly. The vehicle returns to
the previous set speed.
Increasing Speed While Cruise
Control is at a Set Speed
If the cruise control system is
already activated:
Press and hold +RES up until
the desired speed is reached,
then release it.
To increase vehicle speed in
small increments, briefly press
+RES up to the first detent. For
each press, the vehicle goes
about 1 km/h (1 mph) faster.
To increase vehicle speed in
larger increments, briefly press
+RES up to the second detent.
For each press, the vehicle
speed increases to the next
5 km/h (5 mph) mark on the
speedometer.
The speedometer reading can be
displayed in either English or metric
units. See Instrument Cluster 0 111.
The increment value used depends
on the units displayed.
Reducing Speed While Cruise
Control is at a Set Speed
If the cruise control system is
already activated:
Press and hold SET down until
the desired lower speed is
reached, then release it.
To decrease the vehicle speed in
small increments, briefly press
SET down to the first detent.
For each press, the vehicle goes
about 1 km/h (1 mph) slower.
To decrease the vehicle speed in
larger increments, briefly press
SET down to the second
detent. For each press, the
vehicle speed decreases to the
next 5 km/h (5 mph) mark on the
speedometer.
The cruise control system may
automatically brake to slow the
vehicle down (CTS model only).
Driving and Operating
The speedometer reading can be
displayed in either English or metric
units. See Instrument Cluster 0 111.
The increment value used depends
on the units displayed.
Overtaking 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
previously set cruise speed. While
pressing the accelerator pedal or
shortly following the release to
override cruise control, briefly
applying the SET switch will result
in cruise control set to the current
vehicle speed.
Using Cruise Control on Hills
How well the cruise control will work
on hills depends upon the vehicle
speed, load, and the steepness of
the hills. When going up steep hills,
you might have to step on the
accelerator pedal to maintain the
vehicle speed. When going
downhill, the cruise control system
may automatically brake to slow the
vehicle down (CTS model only).
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