Lexus GS 350 Owner's Manual page 357

356
4-5. Using the driving support systems
WARNING
TRC may not operate effectively when
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Directional control and power may not be achievable while driving on slippery road
surfaces, even if the TRC system is operating.
Drive the vehicle carefully in conditions where stability and power may be lost.
Hill-start assist control does not operate effectively when
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Do not overly rely on hill-start assist control. The hill-start assist control may not oper-
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ate effectively on steep inclines and roads covered with ice.
Unlike the parking brake, hill-start assist control is not intended to hold the vehicle
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stationary for an extended period of time. Do not attempt to use hill-start assist con-
trol to hold the vehicle on an incline, as doing so may lead to an accident.
When the VSC is activated
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The slip indicator light flashes. Always drive carefully. Reckless driving may cause an
accident. Exercise particular care when the indicator light flashes.
When the TRC/VSC systems are turned off
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Be especially careful and drive at a speed appropriate to the road conditions. As these
are the systems to help ensure vehicle stability and driving force, do not turn the TRC/
VSC systems off unless necessary.
Expert mode precautions (GS F)
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Do not use on public roads.
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Use only when the road conditions and safety of the surrounding area can be
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ensured.
Proper use of expert mode requires a professional level of driving skill. When using
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expert mode, always check the road conditions and surrounding area and drive more
carefully than usual.
Replacing tires
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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 infla-
tion pressure level.
The ABS, TRC and VSC systems will not function correctly if different tires are installed
on the vehicle.
Contact your Lexus dealer for further information when replacing tires or wheels.
Handling of tires and the suspension
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Using tires with any kind of problem or modifying the suspension will affect the driving
assist systems, and may cause a system to malfunction.
GS350_300_GS F_OM_OM30J17E_(GE)