2006 Lexus GS 300 Owners Manual - Page 1083

STARTING AND DRIVING If any of the following conditions occur, this indicates a malfunction somewhere in the components monitored by the warning light system. Contact your Lexus dealer as soon as possible to service the vehicle. D The light does not come on when engine switch is selected in "IG−ON" mode. D The light remains on after the engine is started (GS430), or remains on a few seconds after the engine switch is selected in "IG−ON" mode (GS300). D The light comes on while you are driving. A warning light turning on briefly during operation does not indicate a problem. Drum−in−disc type parking brake system Your vehicle has a drum−in−disc type parking brake system. This type of brake system needs bedding−down of the brake shoes periodically or whenever the parking brake shoes and/or drums are replaced. Have your Lexus dealer perform the bedding−down. Brake assist system When you slam the brakes on, the brake assist system judges as an emergency stop and provides more powerful braking for a driver who cannot hold down the brake pedal firmly. When you slam the brakes on, more powerful braking will be applied. At this time, you may hear a sound in the engine compartment and feel the vibrations of the brake pedal. This does not indicate a malfunction. The brake assist system becomes operative after the vehicle has accelerated to a speed in excess of approximately 10 km/h (6 mph). It stops operating when the vehicle decelerates to a speed below approximately 5 km/h (3 mph). The brake assist system may not work for about 60 seconds after the engine is started. For an explanation of this system's warning light, see "ABS" warning light on page 80 or 436. CAUTION If the "ABS" warning light remains on together with the brake system warning light (red), immediately stop your vehicle at a safe place and contact your Lexus dealer. In this case, not only the anti−lock brake system will fail but also the vehicle will become extremely unstable during braking. GS430 only-Either of the following conditions may occur, but does not indicate a malfunction: D The light may stay on for about 60 seconds after the engine is started. It is normal if it turns off after a while. D Depressing the brake pedal repeatedly may turn on the light. It is normal if it turns off after a few seconds. 437