GMC SIERRA 2020 Owner's Manual page 247

246 Driving and Operating
Warning
ACC will not detect or brake for
children, pedestrians, animals,
or other objects.
Do not use ACC when:
On winding and hilly roads
or when the camera sensor
is blocked by snow, ice,
or dirt. The system may not
detect a vehicle ahead.
Keep the windshield and
headlamps clean.
When visibility is poor due
to rain, snow, fog, dirt,
insect residue, or dust;
when other foreign objects
obscure the camera s view;
or when the vehicle in front
or oncoming traffic causes
additional environmental
obstructions, such as road
spray. ACC performance is
limited under these
conditions.
(Continued)
Warning (Continued)
On slippery roads where
fast changes in tire traction
can cause excessive
wheel slip
With extremely heavy cargo
loaded in the cargo area or
rear seat
When towing a trailer
: Press to turn the system on or
off. The indicator turns white on the
instrument cluster when ACC is
turned on.
RES+ : Press briefly to resume the
previous set speed or to increase
vehicle speed if ACC is already
activated. To increase speed by
about 1 km/h (1 mph), press RES+
briefly. To increase speed to the
next 5 km/h (5 mph) mark on the
speedometer, hold RES+.
SET : Press briefly to set the
speed and activate ACC or to
decrease vehicle speed if ACC is
already activated. To decrease
speed by about 1 km/h (1 mph),
press SET briefly. To decrease
speed to the next 5 km/h (5 mph)
mark on the speedometer,
hold SET .
: Press to disengage ACC
without erasing the selected set
speed.
: Press to select a following gap
setting for ACC of Far, Medium,
or Near.