Emergency Tensioning Retractor (Etr) - Mercedes-Benz CLK 320 Operator's Manual

Instruments
Operation
and controls
Restraint systems

Emergency tensioning retractor (ETR)

The seat belts for the front seats are equipped with
emergency tensioning retractors. These tensioning
retractors are located in each belt's inertia reel and
become operationally ready with the electronic key in
steering lock position 1 or 2.
The emergency tensioning retractors are designed to
activate only when the seat belts are fastened during
frontal impacts exceeding the first threshold of the SRS
and in rear impacts exceeding a preset severity level.
They remove slack from the belts in such a way that the
seat belts fit more snugly against the body restricting its
forward movement as much as possible.
Instrument
Driving
cluster display
Practical hints Car care
66
In cases of other frontal impacts, angled impacts, roll-
overs, certain side impacts, or other accidents without
sufficient frontal or rear impact forces, the emergency
tensioning retractors will not be activated. The driver
and passengers will then be protected by the fastened
seat belts and inertia reel in the usual manner.
For seat belt and emergency tensioning retractor safety
guidelines see page 73.
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