2014 Chevrolet Impala Owner Manual - Page 253

Driving and Operating 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: ... 9-45 Cleaning the Sensing System The radar sensor 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 on page 10-77. System operation may also be limited under snow, heavy rain or road spray conditions. Driver Assistance Systems This vehicle may have features that work together to help avoid crashes or reduce crash damage while driving, backing, and parking. Read this entire section before using these systems. { Warning Do not rely on the Driver Assistance Systems. These systems do not replace the need for paying attention and driving safely. You may not hear or see alerts or warnings provided by these systems. Failure to use proper care when driving may result in injury, death, or vehicle damage. See Defensive Driving on page 9-3. (Continued) Step lightly on the brake pedal. *. Press ]. Press Erasing Speed Memory The cruise control set speed is erased from memory if ] is pressed or if the ignition is turned off.