2008 Buick Lucerne Owner's Manual - Page 180

Lane Departure Warning Light Your vehicle may have the lane departure warning system. Engine Coolant Temperature Warning Light The engine coolant temperature warning light will come on when the engine has overheated. This light will come on green, briefly, when the vehicle is started to show that it is working. This light will also come on green if the system detects a left or right lane marking. This light will change to amber and flash and three beeps will sound if you cross a detected lane marking without using your turn signal. For more information, see the Index in the Navigation Manual. If this happens you should pull over and turn off the engine as soon as possible. See Engine Overheating on page 5-28 for more information. Notice: Driving with the engine coolant temperature warning light on could cause your vehicle to overheat. See Engine Overheating on page 5-28. Your vehicle could be damaged, and it might not be covered by your warranty. Never drive with the engine coolant temperature warning light on. This light will also come on briefly when starting your vehicle. If it does not, have your vehicle serviced. 3-42