A maximum of two smart keys can be registered to a single vehicle. If you happen to lose your smart key, you should immediately take the vehicle and remaining key to your authorized HYUNDAI dealer or tow the vehicle, if necessary.
Hyundai Tucson (LM) 2010-2015 Service Manual: Components and Components Location
Components
1. Front seat belt2. Height adjuster3. Rear seat belt4. Rear center seat belt buckle
...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Air bag warning light
This warning light will illuminate for approximately 6 seconds each time you
place the ignition switch in the ON position.
This light also comes on when the Supplemental Restraint System (SRS) is not
working properly. If the AIR BAG warning light does not come on, or continuously
remains on ...