ML 55 AMG (163.174) V8-5.5L (113.981) (2001)
Seat Belt Tensioner: Description and Operation
Purpose/Function
Function
The front seat belts have electronically controlled, pyrotechnical emergency tensioning retractors which automatically increase the tension on the seat
belts in the event of a collision (head-on or rear-end collision).
The crash is evaluated and, where necessary, the left front ETR squib (R12/1) and right front ETR squib (R12/2) are triggered by the ETR control
module with airbag (N2/2).