2011 Lexus IS 350 User Guide - Page 202

2-4. Using other driving systems n Automatic reactivation of the TRAC/VSC systems If the TRAC/VSC systems are turned off, re-starting the engine will automatically reactivate them. n Automatic TRAC reactivation If only the TRAC system is turned off, the TRAC system will turn on when vehicle speed increases. n Automatic TRAC and VSC reactivation If the TRAC and VSC systems are turned off, the systems will not turn on even when vehicle speed increases. n Sounds and vibrations caused by the ABS, brake assist, VSC and TRAC systems l A sound may be heard from the engine compartment if the brake pedal is 2 When driving depressed repeatedly 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. 209