2014 Buick Enclave Owner Manual - Page 235

Driving and Operating Push the button to activate the system. Push it again to deactivate the system. You can use this feature to assist when towing or hauling a heavy load. When Tow/Haul is activated, the Tow/Haul symbol will come on in the instrument cluster. See "Tow/Haul Mode" under Driving Characteristics and Towing Tips on page 9-46. The system will automatically command downshifts to reduce vehicle speed, until the brake pedal is no longer being pressed. While in the Electronic Range Select (ERS) mode, grade braking is deactivated, allowing the driver to select a range and limiting the highest gear available. Grade braking is available for normal driving and in Tow/Haul mode. See Automatic Transmission on page 9-22. 9-25 Drive Systems All-Wheel Drive Vehicles with this feature transfer engine power, as required, to all four wheels. It is fully automatic, and adjusts itself as needed for road conditions. When using a compact spare tire on an AWD vehicle, the system automatically detects the compact spare and reduces AWD performance to protect the system. To restore full AWD operation and prevent excessive wear on the system, replace the compact spare with a full-size tire as soon as possible. See Compact Spare Tire on page 10-68. Automatic Engine Grade Braking Automatic Engine Grade Braking assists when driving on a downhill grade. It maintains vehicle speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle.