Cadillac 2015 ATS Owner's Manual page 213

9-38 Driving and Operating
SET (Set/Coast): Press the
control down briefly to set the speed
and activate ACC or to decrease
vehicle speed if ACC is already
activated. To decrease speed by
1 km/h (1 mph), press SET down
to the first detent. To decrease
speed to the next 5 km/h (5 mph)
mark on the speedometer, press
SET down to the second detent.
(Cancel): Press to disengage
ACC without erasing the set speed
from memory.
(Follow Distance Gap): Press
to select a following gap time (or
distance) setting for ACC of Far,
Medium, or Near.
Setting Adaptive Cruise Control
If cruise control is on when not in
use, the cruise on/off control could
get pressed and cruise control could
become active when not desired.
Keep the cruise control off when
cruise is not being used.
Select the set speed desired for
cruise. This is the vehicle speed
when no vehicle is detected in
its path.
ACC will not set at a speed less
than 25 km/h (16 mph), although it
can be resumed when driving at
lower speeds.
To set ACC:
1. Press .
2. Get up to the desired speed.
3. Press and release SET .
4. Remove foot from the
accelerator.
After ACC is set, it may immediately
apply the brakes if a vehicle ahead
is detected closer than the selected
following gap.
The ACC indicator displays in the
instrument cluster and Head-Up
Display (HUD). When the ACC is
active, the indicator turns green.
Be mindful of speed limits,
surrounding traffic speeds, and
weather conditions when selecting
the set speed.
Resuming a Set Speed
If the ACC is set at a desired speed
and then the brakes are applied, the
ACC is disengaged without erasing
the set speed from memory.
To begin using ACC again, press
+RES up briefly on the steering
wheel. The vehicle returns to the
previous set speed.