Regulations for replacement of seat belts A. By mechanical damage, B. Following an accident - ra91001400550x(0550)

Model 140 

1. When damaged mechanically 

   If seat belts are handled improperly (improperly cleaned, stored or pinched), the belt web can be damaged. For this reason visually check the belt web at each maintenance interval. If the belt web is frayed or damaged, e.g. by a burning cigarette, inform the customer that the seat belt needs to be replaced. Belts with signs of abrasion without frayed fibres do not require replacement.

   If a customer refuses to have the damaged seat belt replaced, make an appropriate entry on the repair order.

   If a complaint is received that the "seat belt does not retract properly", before removing check whether the belt winds up properly when returned by hand or whether it is twisted 180° behind the panelling due to improper handling. For this purpose remove the panelling.

   Fig 1: Identifying Seat Belts

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2. Following accidents 

If one or both belt tensioners where not  triggered during an accident, check for mechanical damage according to item A.

If one or both belt tensioners have been triggered during an accident, always replace the entire belt tensioner and check the belt buckle for mechanical damage; replace, if required.

Triggering logic for belt tensioner (standard) 

• Both belt tensioners are triggered simultaneously (connected in parallel).

Triggering logic for airbag with belt tensioner 

• Only the belt tensioner, whose locking tongue is inserted into the belt buckle, is triggered.

Checking belt tensioner for triggering 

• Belt tensioner (standard), Diagnosis Manual, Body, Volume 2, index 17.2.
• Airbag with belt tensioner, Diagnosis Manual, Body, Volume 2, index 16.2.