Warning! The noises that occur when the seat belt webbing is wound up are caused by the operation of the device. If disturbing noises occur, the only option is to replace the seat belt. Never use oil or grease to eliminate the noise. The automatic seat belt retractor mechanism must not be damaged, as this could cause the pre-tensioned spring to jump out. There is a risk of injury!
1. Pull the seat belt out completely and check the webbing for frayed fibers.
2. Damage may be caused, for example, by a pinched seat belt or by burning cigarettes. In this case, replace the seat belt. If there are chafed areas without signs of fraying of the fibres, the seat belt does not need to be replaced.
3. Check the hard-to-move seat belt for twisting, if necessary, remove the trim from the B-pillar.
4. If the automatic seat belt retractor no longer functions, replace the belt.
Warning! Clean seat belt webbing only with soap and water, never use solvents or chemical detergents.
[Original article is on the portal: www.mercedesman.ru]