2012 Lexus IS 350 User Guide - Page 215

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2-4. Using other driving systems

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When the message is displayed on the multi-information display showing that

TRAC has been disabled even if the VSC off switch has not been pressed

TRAC and hill-start assist control cannot be operated. Contact your Lexus dealer.

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Automatic reactivation of the TRAC/VSC systems

If the TRAC/VSC systems are turned off, re-starting the engine will automatically

reactivate them.

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Automatic TRAC reactivation

If only the TRAC system is turned off, the TRAC system will turn on when vehicle

speed increases.

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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.

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Sounds and vibrations caused by the ABS, brake assist, VSC and TRAC systems

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A sound may be heard from the engine compartment if the brake pedal is

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.

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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.