Hill-Start Assist Control Does Not Operate Effectively When; When The Vsc/Trailer Sway Control Is Activated - Warning; When The Trac/Vsc/Trailer Sway Control Systems Are Turned Off - Warning; Trailer Sway Control Precaution - Lexus rx450h Service Manual

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4-5. Using the driving support systems
WARNING

Hill-start assist control does not operate effectively when

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Do not overly rely on the hill-start assist control. The hill-start assist control may not
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operate 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/Trailer Sway Control 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 TRAC/VSC/Trailer Sway Control 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
TRAC/VSC/Trailer Sway Control systems off unless necessary.
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, TRAC, VSC and Trailer Sway Control 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.

Trailer Sway Control precaution

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The Trailer Sway Control system is not able to reduce trailer sway in all situations.
Depending on many factors such as the conditions of the vehicle, trailer, road surface,
and driving environment, the Trailer Sway Control system may not be effective. Refer to
your trailer owner' s manual for information on how to tow your trailer properly.
If trailer sway occurs
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Observe the following precautions.
Failing to do so may cause death or serious injury.
Firmly grip the steering wheel. Steer straight ahead.
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Do not try to control trailer swaying by turning the steering wheel.
Begin releasing the accelerator pedal immediately but very gradually to reduce
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speed.
Do not increase speed. Do not apply vehicle brakes.
If you make no extreme correction with the steering or brakes, your vehicle and trailer
should stabilize. (P. 227)
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