KIA Optima Hybrid 2013 - Manual (Page 244)

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Driving your vehicle
Hill-start assist control (HAC)
Hill start Assist Control works to prevent
the vehicle from rolling backwards while
driving from a stop on an inclined sur-
face. HAC holds the braking pressure
built up during stopping. The brakes are
held for 2 seconds after releasing brake
pedal.
During the pressure-hold period, the
driver has enough time to press the
accelerator pedal to drive off.
The braking pressure is reduced as soon
as the system detects the driver’s inten-
tion to drive off.
• The HAC does not operate when the
transaxle shift lever is in the P (Park) or
N (Neutral) position.
• The HAC activates even though the
ESP is off but it does not activate when
the ESP has malfunctioned.
WARNING - Operating ESC
Never press the ESC OFF button
while ESC is operating.
If the ESC is turned off while ESC is
operating, the vehicle may go out of
control.
WARNING - Activating
HAC
Drivers should pay close attention
when activating the HAC. The vehi-
cle may roll backward causing an
accident due to insufficient brake
hold pressure.