2006 Lexus GS 300 Owners Manual - Page 725

GAUGES, METERS AND SERVICE REMINDER INDICATORS (f) Charging System Warning Light This warning light comes on when the engine switch is selected in "IG−ON" mode, and goes off when the engine is started. When there are problems in the charging system while the engine is running, the warning light comes on. (g) Malfunction Indicator Lamp This lamp comes on when the engine switch is selected in "IG−ON" mode and goes off after the engine starts. This means that the warning light system is operating properly. If the lamp remains on, or the lamp comes on while driving, first check the followings: D Empty fuel tank If the fuel tank is empty, refuel immediately. D Loose fuel tank cap If the fuel tank cap is loose, securely tighten it. These cases are temporary malfunctions. The malfunction indicator lamp will go off after taking several driving trips. If the lamp does not go off even after several trips, contact your Lexus dealer as soon as possible. If the fuel tank is not empty or the fuel tank cap is not loose...D There is a problem somewhere in the engine, emission control system, electronic throttle control system, automatic transmission electrical system or warning light system itself. Contact your Lexus dealer as soon as possible to service the vehicle. If this lamp comes on and engine speed does not increase when the accelerator pedal is depressed, there may be a problem somewhere in the electronic throttle control system. NOTICE When the charging system warning light comes on while the engine is running, malfunctions such as the engine drive belt being broken may have occurred. If the warning light comes on, immediately stop the vehicle in a safe place and contact your Lexus dealer. 79