ML 430 (163.172) V8-4.3L (113.942) (2000)
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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).
