The trunk can be opened with no-touch activation under all the conditions below.

NOTICE

The Smart Trunk does not operate when:

The smart key is detected within 15 seconds after the doors are closed, locked and is continuously detected.
The smart key is detected within 15 seconds after the doors are closed and locked, and 60 inches (1.5 m) from the front door handles. (for vehicles equipped with Welcome Light)
A door is not locked or closed.
The smart key is in the vehicle.

Setting

Make sure the shift lever is in P (Park) (for Dual Clutch Transmission/ Intelligent Variable Transmission) or first gear or R (Reverse) (for Manual Transmission) and set the parking brake.

You can activate or deactivate the Smart Trunk by selecting 'User Settings (LCD display) or Settings → Vehicle (Infotainment System screen) → Door → Smart Trunk'.
Detect and Alert

If you are positioned in the detecting area (20 ~ 40 inches (50 ~ 100 cm) behind the vehicle) carrying a smart key, the hazard warning lights will blink and the chime will sound to alert you the smart key has been detected and the trunk will open.

NOTICE

Do not approach the detecting area if you do not want the trunk to open. If you have unintentionally entered the detecting area and the hazard warning lights and chime starts to operate, leave the detecting area with the smart key. The trunk will stay closed.
Automatic opening

The hazard warning lights will blink and the chime will sound 2 times. The trunk will open.

Make sure you close the trunk before driving your vehicle.
Make sure there are no people or objects around the trunk before opening or closing the trunk.
Make sure to deactivate the Smart Trunk when washing your vehicle. Otherwise, the trunk may open inadvertently.

WARNING

Make sure objects in the trunk do not fall out when opening the trunk on a slope. It may cause serious injury.

NOTICE

The key should be kept out of reach of children. Children may inadvertently open the Smart Trunk while playing around the rear area of the vehicle.