2007 Lexus GS 350 Owners Manual - Page 238

2-4. Using other driving systems n Automatic reactivation of TRAC and VSC Turning the engine switch OFF after turning off the TRAC and VSC systems will automatically re-enable them. n Automatic TRAC reactivation If only the TRAC system is turned off, the TRAC system will turn on when the vehicle speed increases. n Automatic TRAC and VSC reactivation If only the both TRAC and VSC systems are turned off, the systems will not turn on even when the vehicle speed increases. n Sounds and vibrations caused by the ABS, BA, VSC, TRAC, hill-start assist con- trol and VGRS systems l A sound may be heard from the engine compartment when the engine is started or just after the vehicle begins to move. This sound does not indicate that a malfunction has occurred in any of these systems. l Any of the following conditions may occur when the above systems are operat- ing. None of these indicates that a malfunction has occurred Vibrations may be felt through the vehicle body and steering. A motor sound may be heard after the vehicle comes to a stop. The brake pedal may pulsate slightly after the ABS is activated. The brake pedal may move down slightly after the ABS is activated. n Hill-start assist control is operational when l The shift lever is in the "D" or "S" position. l The brake pedal is not depressed. n VGRS is disabled in the following situations (GS430) l During stopping or the steering wheel has been moved for a long time while driving at lower speeds. l After the engine is restarted at less than -22°F (-30°C). n Reduced effectiveness of EPS The effectiveness of EPS is reduced to prevent the system from overheating when there is frequent steering input over an extended period of time. The steering wheel may feel heavy as a result. Should this occur, refrain from excessive steering input or stop the vehicle and turn the engine OFF. The system should return to normal within 10 minutes. 162