If the Smart Key does not operate normally, you can lock or unlock the door by using the mechanical key.

Press and hold the release button (1) and remove the mechanical key (2). Insert the mechanical key in to the key hole on the door.
To reinstall the mechanical key, put the key into the hole and push it until a click sound is heard.
Start-up
Loss of a smart keyHyundai Tucson (LM) 2010-2015 Service Manual: Receiver-Drier Repair procedures
Replacement
1.
Remove the condenser, and then remove the bottom cap (B) with L wrench (A) from the condenser.
Tightening torque :
20 ~ 25 N.m (2.0 ~ 2.5 kgf.m, 14.5 ~ 18.2 lb-ft)
2.
Remove the desiccant (A) from condenser using a long nose plier. Check for crumbled desiccant and cl ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Reporting safety defects
If you believe that your vehicle has a defect which could cause a crash or could
cause injury or death, you should immediately inform the
National Highway Traffic Safety Administration (NHTSA) in addition to notifying
HYUNDAI MOTOR AMERICA.
If NHTSA receives similar complaints, it may open an ...