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: Front Driveshaft Repair procedures
Removal
1.
Remove the front wheel and tire (A) from front hub .
Tightening torque:
88.2 ~ 107.8 N.m (9.0 ~ 11.0 kgf.m, 65.0 ~ 79.5 lb-ft)
Be careful not to damage to the hub bolts when removing the front wheel and tire (A).
2.
Remove the coking nut (A).
Tig ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Brake fluid
Checking the brake fluid level
Check the fluid level in the reservoir periodically. The fluid level should be
between MAX and MIN marks on the side of the reservoir.
Before removing the reservoir cap and adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent brake ...