2012 Lexus IS 350 User Guide - Page 194

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2-4. Using other driving systems

2

CAUTION

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TRAC may not operate effectively when

Directional control and power may not be achievable while driving on slippery road

surfaces, even if the TRAC system is operating.

Do not drive the vehicle in conditions where stability and power may be lost.

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If hill-start assist control does not operate effectively

(vehicles with an automatic transmission)

Do not overly rely on the hill-start assist control. The hill-start assist control may not

operate effectively on steep inclines and roads covered in ice.

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When the VSC is activated

The slip indicator light flashes. Always drive carefully. Reckless driving may cause

an accident, resulting in death or serious injury. Exercise particular care when the

indicator light flashes.

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When TRAC and VSC are off

Be especially careful and drive at a speed appropriate to the road conditions. As

these are systems to help enhance vehicle stability and driving force, do not turn off

TRAC and VSC unless necessary.

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Replacing tires

Make sure that all tires are of the specified size, brand, tread pattern and total load

capacity. In addition, make sure that the tires are inflated to the recommended tire

pressure level.

The ABS, VSC and TRAC systems will not function correctly if different tires are fit-

ted on the vehicle.

Contact your Lexus dealer for further information when replacing tires or wheels.

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Handling of tires and suspension

Using tires with any kind of problem or modifying the suspension will affect the driv-

ing assist systems, and may cause the system to malfunction.