Hyundai Veloster: To set cruise control speed:

1. Press the cruise ON/OFF button on the steering wheel, to turn the system on. The CRUISE indicator light in the instrument cluster will illuminate.
2. Accelerate to the desired speed, which must be more than 40 km/h (25 mph).

3. Move the lever down (to SET-), and release it at the desired speed. The SET indicator light in the instrument cluster will illuminate. Release the accelerator pedal at the same time. The desired speed will automatically be maintained.
On a steep grade, the vehicle may slow down or speed up slightly while going downhill.
Cruise control system
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Description
Curtain airbags are installed inside the headliner (LH and RH) and protect
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Components
...
High mounted stop light replacement
If the light does not operate, have the vehicle checked by an authorized HYUNDAI
dealer.
3. Loosen the assembly retaining nuts. 4. Remove the rear combination light
assembly from the body of th ...