Kia Optima: HAC (Hill-start assist control) - Driving your vehicle - Kia Optima TF 2011-2021 Owners ManualKia Optima: HAC (Hill-start assist control)

Hill start Assist Control is a comfort function. The main intend is to prevent the vehicle from rolling backwards while driving off uphill on an inclined surface. HAC holds the braking pressure builtup by driver during stopping procedure 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 intention to drive off.

The HAC is usually activated only for 2 seconds. The driver should be careful WARNING

The HAC is usually activated only for 2 seconds. The driver should be careful from the rolling backward causing the accident with behind objects or human, when the driver may feel the unintended rolling backward while driving off on hill due to insufficient brake hold pressure built-up by driver during stopping procedure.

✽ NOTICE

ESC (Electronic stability control)
The Electronic Stability control (ESC) system is designed to stabilize the vehicle during cornering maneuvers. ESC checks where you are steering and where the vehicle is actually going. ESC appl ...

VSM (Vehicle stability management)
This system provides further enhancements to vehicle stability and steering responses when a vehicle is driving on a slippery road or a vehicle detected changes in coefficient of friction between ...

See also:

Troubleshooting
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Checking the Manual Transaxle Oil Level
1. Raise and suitably support the vehicle. WARNING - Lifting Your Vehicle If you raise your vehicle, always ensure that it is supported at all four jacking or lift points for the vehicle. Do ...

Removal
1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Remove the fuel pump service cover (A) in the trunk. 3. ...

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