Hyundai Tucson: Cruise control operation / To decrease cruise control speed

Hyundai Tucson (LM) 2010-2015 Owners Manual / Driving your vehicle / Cruise control system / Cruise control operation / To decrease cruise control speed

Push the lever (1) down (to SET-) and hold it. Your vehicle will gradually slow down. Release the lever at the speed you want to maintain.
Push the lever (1) down (to SET-) and release it immediately. The cruising speed will decrease 1.0 mph (1.6 km/h) each time the lever is operated in this manner.
Lightly tap the brake pedal. When the vehicle attains the desired speed, push the lever (1) down (to SET-).

To increase cruise control speed

Push the lever (1) up (to RES+) and hold it, while monitoring the SET speed on the instrument cluster. Release the lever when the desired speed is shown and the vehicle will accelerate to ...

To temporarily accelerate with the cruise control ON

Depress the accelerator pedal.When you take your foot off the accelerator, the vehicle will return to the previously set speed. If you push the lever (1) down (to SET-) at the increased speed, the ...

Other information:

Hyundai Tucson (LM) 2010-2015 Service Manual: Troubleshooting
Troubleshooting • The battery must be in good condition and fully charged for this troubleshooting. ...

Hyundai Tucson (LM) 2010-2015 Service Manual: Smart Key Unit Repair procedures
Removal Smart Key Unit 1. Disconnect the negative (-) battery terminal. 2. Remove the glove box housing. (Refer to the BD group - "Crash pad") 3. After disconnecting the smart key unit connector (A), loosen the smart key unit mounting bolts, and remove the smart key unit (B). RF R ...