Reactivation Of The Trac/Vsc Systems After Turning Off The Engine; Automatic Trac Reactivation; Automatic Trac And Vsc Reactivation; Sounds And Vibrations Caused By The Abs, Brake Assist, Vsc, Trac - Lexus IS250 2009 Service Manual

Reactivation of the TRAC/VSC systems after turning off the engine

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Turning off the engine after turning off the TRAC/VSC systems will automatically
reactivate 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 and VSC reactivation

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If the TRAC and 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 and hill-start
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assist control 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.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
2-4. Using other driving systems
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