Lexus RX 450h 2010 Owner's Manual page 260

Hill-start assist control buzzer
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When hill-start assist control is activated, the buzzer will sound once.
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In the following situations, hill-start assist control will be canceled and the
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buzzer will sound twice.
• No attempt is made to drive the vehicle within approximately 2 seconds of
releasing the brake pedal.
• The shift lever is moved to P.
• The parking brake is applied.
• The brake pedal is depressed again.
• The brake pedal has been depressed for more than approximately 3 minutes.
If the slip indicator comes on
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It may indicate a malfunction in the system. Contact your Lexus dealer.
CAUTION
Hill-start assist control
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Do not overly rely on hill-start assist control. Hill-start assist control may not oper-
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ate effectively on extremely steep inclines or roads covered in ice.
Unlike the parking brake, hill-start assist control is not intended to hold the vehi-
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cle stationary for an extended period of time. Do not attempt to use hill-start
assist control to hold the vehicle on an incline for an extended period of time, as
doing so may lead to an accident.
2-4. Using other driving systems
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