Lexus LS460 2008 Owner's Manual page 212

2-4. Using other driving systems
Automatic reactivation of TRAC and VSC
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Turning the "ENGINE START STOP" 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 vehicle
speed increases.
Automatic TRAC/VSC reactivation
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If the TRAC/VSC systems are turned off, the systems will not turn on even when
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 engine 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.
Hill-start assist control is operational when
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The shift lever is in the "D" or "S" position.
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The brake pedal is not depressed.
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EPS operation sound
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When the steering wheel operates, a motor sound (whirring sound) may be heard.
This does not indicate a malfunction.
VGRS is disabled in the following situations
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The center position of the steering wheel may change when VGRS is disabled.
However, the position will return to normal after VGRS is re-enabled.
When the steering wheel has been operated for an extended period of time
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while the vehicle is stopped or is moving very slowly
When the steering wheel has been held fully to the left or right
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When the battery is low or the voltage temporarily drops
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After the engine is started at lower than -22°F (-30°C).
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