Chevrolet Impala Owner's Manual page 248

9-40 Driving and Operating
To begin using ACC again, press
the +RES button on the steering
wheel. The vehicle returns to the
previous set speed.
Increasing Speed While ACC is at
a Set Speed
If ACC is already activated, do one
of the following:
Use the accelerator to get to the
higher speed. Press the SET
button. Release the control and
the accelerator pedal. The
vehicle will now cruise at the
higher speed.
When the accelerator pedal is
pressed, ACC will not brake
because it is overridden.
A warning message will appear
on the Driver Information Center
(DIC). See
Press and hold the +RES button
until the desired set speed
appears on the display, then
release it.
To increase vehicle speed in
small increments, briefly press
+RES. For each press the
vehicle goes 5 km/h (1 mph)
faster.
When it is determined that there is
no vehicle ahead or the vehicle is
beyond the selected following gap,
then the vehicle speed will increase
to the set speed.
The speedometer reading can be
displayed in either English or metric
units. See
. The increment value used
depends on the units displayed.
Reducing Speed While ACC is at a
Set Speed
If ACC is already activated, do one
of the following:
Use the brake to get to the
.
desired lower speed. Press the
SET button and release the
accelerator pedal. The vehicle
will now cruise at the lower
speed.
Press and hold the SET button
until the desired lower speed is
reached, then release it.
To decrease the vehicle speed in
smaller increments, briefly press
SET . For each press, the
vehicle goes about 5 km/h
(1 mph) slower.
The speedometer reading can be
displayed in either English or metric
units. See
. The increment value used
depends on the units displayed.
Selecting the Follow Distance Gap
When a slower moving vehicle is
detected ahead within the selected
following gap, ACC will adjust the
vehicle's speed and attempt to
maintain the follow distance gap
selected.
Press GAP on the steering wheel to
adjust the following gap. When
pressed, the current gap setting
displays briefly on the instrument
cluster.