ML 430 (163.172) V8-4.3L (113.942) (2000)
Seat Belt Tensioner: Description and Operation
GF91.40-P-4001-02A Rear Emergency Tensioning Retractor, Purpose
GF91.40-P-4001-02A Rear Emergency Tensioning Retractor, Purpose
The rear emergency tensioning retractor improves the passenger protection for passengers in the left and right rear of the vehicle in the event of a front
end or rear end collision when the seat belts are buckled.
In the event of a collision the emergency tensioning retractor ensures that the seat belt around the passenger's body is snug and that any slack in the
loosely rolled-up seat belt is tensioned in the automatic belt reel.
This allows the seat belt to develop its maximum protection potential. The snug seat belt makes it possible for the vehicle passenger to conform to the
deceleration of the vehicle more quickly thereby reducing the consequences of the accident.