Lexus GS 450h 2008 Owner's Manual page 205

Automatic reactivation of TRAC and VSC
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Turning the "POWER" switch OFF after turning off the TRAC and VSC systems will
automatically re-enable them.
Automatic TRAC reactivation
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If only the TRAC system is turned off, the TRAC system will turn on when the vehi-
cle speed increases.
Automatic TRAC and VSC reactivation
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If the TRAC and VSC systems are turned off, the systems will not turn on even when
the vehicle speed increases.
Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC, hill-start
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assist control and VGRS systems
A sound may be heard from the engine compartment when the hybrid system is
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started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in any of these systems.
Any of the following conditions may occur when the above systems are operat-
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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.
Hill-start assist control operating conditions
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This system comes into operation under the following conditions after the brake
pedal has been depressed and the vehicle has come to a stop:
The shift lever is in the "D" or "S".
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The system has detected that the vehicle is moving backwards.
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2-4. Using other driving systems
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