2015 Buick Regal Owner Manual - Page 226

Driving and Operating When braking is active, the brake lights will come on. The automatic braking may feel or sound different than if the brakes were applied manually. This is normal. Stationary or Very Slow-Moving Objects ACC Automatically Disengages ACC may automatically disengage and the driver will need to manually apply the brakes to slow the vehicle when: . . 9-45 The sensors are blocked. The traction control system (TCS) or electronic stability control system has activated or been disabled. No traffic or other objects are being detected. There is a fault in the system. { Warning Adaptive Cruise Control (ACC) may not detect and react to stopped or slow-moving vehicles ahead of you. For example, the system may not brake for a vehicle it has never detected moving. This can occur in stop-and-go traffic or when a vehicle suddenly appears due to a vehicle ahead changing lanes. Your vehicle may not stop and could cause a crash. Use caution when using ACC. Your complete attention is always required while driving and you should be ready to take action and apply the brakes. . If the stopped vehicle ahead has driven away and ACC has not resumed, the vehicle ahead symbol will flash as a reminder to check traffic ahead before proceeding. In addition, three beeps will sound. See "Go Notifier" in "Collision/ Detection Systems" under Vehicle Personalization on page 5-47. When the vehicle ahead drives away, press RES+ or the accelerator pedal to resume cruise control. If stopped for more than two minutes or if the driver door is opened and the driver safety belt is unbuckled, the ACC automatically applies the electric parking brake to hold the vehicle. The electric parking brake status light will turn on. See Parking Brake on page 9-32. To resume ACC and release the electric parking brake, press the accelerator pedal. A DIC warning message may display indicating to shift to P (Park) before exiting the vehicle. See Vehicle Messages on page 5-38. . A message indicating that cruise is disengaging will appear on the DIC and the ACC active symbol will not be displayed when ACC is no longer active. Notification to Resume ACC ACC will maintain a follow gap behind a detected vehicle and slow your vehicle to a stop behind that vehicle.