2014 Buick Regal Owner Manual - Page 228

9-48 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: ... Other Vehicle Lane Changes Cleaning the Sensing System The radar sensor on the front of the vehicle can become blocked by snow, ice, dirt, or mud. This area needs to be cleaned for ACC to operate properly. For cleaning instructions, see "Washing the Vehicle" under Exterior Care on page 10-86. System operation may also be limited under snow, heavy rain, or road spray conditions. 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 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.