1996 Cadillac Seville Owner's Manual - Page 130

Engine Coolant Temperature Warning Light This red light tellsyou that the engine has overheated. You should stop the car and turn the engine off as soon as possible. A warning chime should also sound if this light comeson. Malfunction Indicator Lamp (Service Engine Soon Light) Your Cadillac is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. SERVICE ENGINE SOON As a check, the light should come on for a few seconds when you start your engine. In the section "Problems on the Road," this manual explains what to do. See "Engine Overheating'' in the Index. This systemis called OBD I1 (.On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptablelevels for the life of the vehicle, helping to produce a cleaner environment. (In Canada, OBD I1 is replaced by Enhanced Diagnostics.) The SERVICEENGINE SOON light comes on to indicate that there is a problem and service is required. Malfunctions often willbe indicated by the system before any problem is apparent, which may prevent more serious damage to your vehicle. This system is alsodesigned to assist your service technician in correctly diagnosing any malfunction. 2-71