Seat belt systems should never be disassembled or modified. In addition, care should be taken to assure that seat belts and belt hardware are not damaged by seat hinges, doors or other abuse.
Periodic inspection
All seat belts should be inspected periodically for wear or damage of any kind. Any damaged parts should be replaced as soon as possible.
Keep belts clean and dry
Seat belts should be kept clean and dry. If belts become dirty, they can be cleaned by using a mild soap solution and warm water. Bleach, dye, strong detergents or abrasives should not be used because they may damage and weaken the fabric.
When to replace seat belts
The entire seat belt assembly or assemblies should be replaced if the vehicle has been involved in an accident.
This should be done even if no damage is visible. Additional questions concerning seat belt operation should be directed to an authorized HYUNDAI dealer.
Do not lie down
Child restraint systemHyundai Tucson (LM) 2010-2015 Service Manual: Repair procedures
Inspection
1.
After disconnecting the vapor hose from the PCV valve, remove the PCV valve.
2.
Reconnect the PCV valve to the vapor hose.
3.
Run the engine at idle, then put a finger over the open end
of the PCV valve and make sure that intake manifold vacuum can be felt.
  ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Owner maintenance
WARNING
Performing maintenance work on a vehicle can be dangerous. If you lack sufficient
knowledge and experience or the proper tools and equipment to do the work, have
it done by an authorized HYUNDAI dealer. ALWAYS follow these precautions for performing
maintenance work:
Park your veh ...