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.
Hyundai Tucson (LM) 2010-2015 Owners Manual: Interior care
Interior general precautions
Prevent caustic solutions such as perfume and cosmetic oil, from contacting the
interior parts because they may cause damage or discoloration. If they do contact
the interior parts, wipe them off immediately. See the instructions for the proper
way to clean vinyl. ...
Hyundai Tucson (LM) 2010-2015 Service Manual: Pressure Sensor Description and Operation
Description
The 4WD ECU makes a Motor Pump(Actuator) turn round for
generating an oil pressure. And then it presses a multiple disk clutch
and transfers the generated torque into rear wheels. Its torque value
varies according to a pressure status. ...