Regulations for replacement of seat belts A. By mechanical damage, B. Following an accident - ra91001400625x(0625)

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Model 140

In the Case of Mechanical Damage
If seat belts are incorrectly handled (wrongly cleaned, put in an unsuitable position or pinched), the seat belt webbing may be damaged. Therefore ensure that the maintenance service makes a visual check of the seat belt webbing. If split fibres or, for example, damage caused by a burning cigarette are detected on the seat belt webbing, the customer must be informed that it is necessary to replace the seat belt. In the case of wear resulting from friction without split fibres it is not necessary to replace the seat belt.

If a customer refuses to replace a damaged seat belt, a remark to this effect is to be entered in the repair order.

In the case of a complaint that "the seat belt does not roll up correctly", before removal check whether the seat belt can be fed back correctly by hand and whether it has been twisted through 180° behind the facing due to improper handling. Remove facing for this purpose.

Fig 1: Identifying Seat Belts
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
After Accidents
If one or both seat belt tensioners were not triggered in an accident, a check for mechanical damage is to be carried out in accordance with Point A.

If one or both seat belt tensioners were triggered in an accident, the complete seat belt tensioner is always to be replaced and the seat belt lock checked for mechanical damage and if necessary replaced.

Triggering Logic of the Seat Belt

Tensioner (Standard)

Both seat belt tensioners are triggered at the same time (parallel switching).

Triggering Logic of Airbag with Seat Belt Tensioner

Only the seat belt tensioners whose lock tongue is inserted in the seat belt lock is triggered.

Checking Triggering of the Seat Belt Tensioners

Seat belt tensioner (standard), Diagnosis Manual, Bodywork Volume 2, Register 17.2.
Airbag with seat belt tensioner, Diagnosis Manual, Bodywork Volume 2, Register 16.2.