1993 Oldsmobile Silhouette Owner's Manual - Page 112
1993 Oldsmobile Silhouette Manual
Page 112 highlights
Features & Controls SLIDIP GAT1 SERVICE ENGINE SOON 120 U2165 Malfunction IndicatorLamp (Service EngineSoon Light) A computer monitorsoperation of your fuel, ignition and emissioncontrols systems. This light should comeon when the ignition is on but the engine is not running, as a check to show you it is working. If it does not come on at all, have it fixed rightaway. If it stays on, or it comes on while you are driving, the computer is indicating thatyou have a problem. You should take your vehicle in for service soon. Lifigate Ajar Warning light If you keep driving your vehicle with this light on, after awhile the emission controls won't work as well, yourfuel economy won't be as good and yourengine may not run as smoothly. This could lead to costly repairs not covered by you1 warranty. The GATE AJAR light on your instrument panel will come on if your liftgate is not completely closed.