2009 Cadillac DTS Owner's Manual - Page 199

Lane Departure Warning (LDW) Light For vehicles with the lane departure warning system, this light briefly comes on amber, while starting the vehicle, to indicate that it is working. When LDW is active, the amber warning symbol comes on and flashes. Three beeps sound if a lane marking is crossed without using the turn signal. If the warning symbol is not on, LDW is not operating and will not warn when the vehicle crosses a lane marking. Engine Coolant Temperature Warning Light The engine coolant temperature warning light comes on when the engine is very hot. If it does not, have the vehicle serviced by your dealer/retailer. If the system is working normally the indicator light then goes off. When driving at speeds of 35 mph (56 km) or greater and LDW is turned on, a green warning symbol appears when the system has detected lane markings on at least one side of the vehicle. For more information see Lane Departure Warning (LDW) on page 2-49. This light also comes on briefly when the vehicle is started. If the light does not go out or comes on and stays on while driving, there may be a problem with the cooling system. Driving with engine coolant temperature light on could cause the vehicle to overheat, see Overheated Engine Protection Operating Mode on page 5-30. See Engine Overheating on page 5-28 and DIC Warnings and Messages on page 3-73 for more information. 3-59