GMC ACADIA 2017 Owner's Manual page 254

Other Vehicle Lane Changes
ACC will not detect a vehicle ahead
until it is completely in the lane. The
brakes may need to be manually
applied.
Do Not Use ACC on Hills and
When Towing a Trailer
Do not use ACC when driving on
steep hills or when towing a trailer.
ACC will not detect a vehicle in the
lane while driving on steep hills. The
driver will often need to take over
acceleration and braking on steep
hills, especially when towing a
trailer. If the brakes are applied, the
ACC disengages.
Disengaging ACC
There are three ways to
disengage ACC:
Step lightly on the brake pedal.
Press .
Press .
Erasing Speed Memory
The cruise control set speed is
erased from memory if
pressed or if the ignition is
turned off.
Driving and Operating
Cleaning the Sensing System
The camera sensor on the
windshield behind the rearview
mirror and the radar sensors on the
front of the vehicle can become
blocked by snow, ice, dirt, or mud.
These areas need to be cleaned for
ACC to operate properly.
For cleaning instructions, see
Washing the Vehicle under
Exterior Care 0 358.
System operation may also be
limited under snow, heavy rain,
or road spray conditions.
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