TOYOTA 2010 Prius - Manual (Page 270)

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2-4. Using other driving systems
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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
buzzer will sound twice.
• No attempt is made to drive the vehicle within approximately 2 seconds
of releasing the brake pedal.
• The “P” position switch is pressed.
• The parking brake is applied.
• The brake pedal is depressed again.
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If the slip indicator comes on...
It may indicate a malfunction in the system. Contact your Toyota dealer.
CAUTION
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Hill-start assist control
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Do not overly rely on hill-start assist control. Hill-start assist control may
not operate effectively on extremely steep inclines or roads covered in ice.
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Unlike the parking brake, hill-start assist control is not intended to hold the
vehicle 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.