Using seat belts :

Regularly check the condition of all seat belts.

Keep the seat belts clean.

Never let any foreign bodies and liquids get on to the seat belt, the latch plate or into the slot for the seat belt buckle.

Do not trap or damage the seat belt and latch plate, for example when closing the door.

Never remove, modify or repair the seat belt or any part of the belt fixture system.

Always fasten the seat belt correctly before any journey and wear it properly while the vehicle is in motion.
Twisted seat belt
If it is difficult to remove the seat belt from the belt guide, the seat belt may have become twisted if it was allowed to return too quickly into the side trim:
Fasten the seat belt even if you are unable to undo the twist. However, the twist should not be in part of the seat belt which comes into direct contact with the body. Go to a qualified workshop immediately and have the twist corrected.

WARNING
Using seat belts
Fastening and unfastening seat beltsVolkswagen Touran Owners Manual. Securing a child seat with a seat belt
First read and observe the introductory information
and safety warnings It is permissible to fasten child
seats with universal written on the orange label to the seats using
the seat belt but only on the seats marked in the table with a u.
Weight class
...
Volkswagen Touran Owners Manual. Introduction
This chapter contains information on the following subjects:
→ An economic driving style
→ Driving in a way which will save fuel
Fuel economy, environmental impact and wear on the engine, brakes and tyres depend
largely on three factors:
Personal driving style.
...