Lexus GS450h Owner's Manual page 329

Automatic system cancelation of hill-start assist control
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The hill-start assist control will be canceled in any of the following situations;
The shift lever is shifted to N or P.
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The accelerator pedal is depressed.
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The parking brake is engaged.
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Approximately 2 seconds elapse after the brake pedal is released.
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Operating conditions of emergency brake signal
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When the following three conditions are met, the emergency brake signal will operate:
The emergency flashers are off.
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Actual vehicle speed is over 55 km/h (35 mph).
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The brake pedal is depressed in a manner that cause the system to judge from the vehi-
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cle deceleration that this is a sudden braking operation.
Automatic system cancelation of emergency brake signal
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The emergency brake signal will turn off in any of the following situations:
The emergency flashers are turned on.
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The brake pedal is released.
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The system judges from the vehicle deceleration that is not a sudden braking operation.
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WARNING
The ABS does not operate effectively when
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The limits of tire gripping performance have been exceeded (such as excessively
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worn tires on a snow covered road).
The vehicle hydroplanes while driving at high speed on wet or slick roads.
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Stopping distance when the ABS is operating may exceed that of normal conditions
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The ABS is not designed to shorten the vehicle's stopping distance. Always maintain a
safe distance from the vehicle in front of you, especially in the following situations:
When driving on dirt, gravel or snow-covered roads
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When driving with tire chains
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When driving over bumps in the road
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When driving over roads with potholes or uneven surfaces
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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 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.
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4-5. Using the driving support systems
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