Supplemental restraint system (SRS)
Emergency tensioning retractor (ETR)
Airbags are intended as a supplement to seat belts.
Airbags alone cannot protect as well as airbags plus
seat belts in impacts for which the airbags were
designed to operate, and do not afford any protection
whatsoever in crashes for which the airbags are not
designed to deploy.
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.
The SRS uses two crash severity levels (thresholds) to
activate either the emergency tensioning retractor (ETR)
or front airbag or both. Activation depends on the
direction and severity of the impact exceeding the
preset thresholds and whether the seat belt is fastened.
Seat belt fastened
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.
•
•
first threshold exceeded: ETR activates
second threshold exceeded: airbag also activates
Seat belt not fastened
•
first threshold exceeded:
airbag activates, but not ETR
For seat belt and emergency tensioning retractor safety
guidelines see page 69.
Driver and front passenger systems operate
independently of each other.
63
Restraint systems
Instruments
and controls
Instrument
cluster display
Technical
data
Operation
Driving
Practical hints
Car care
Index
| Categories | Mercedes-Benz CLK-Class Manuals, Mercedes-Benz Manuals |
|---|---|
| Tags | Coupe, Mercedes-Benz CLK430, Mercedes-Benz W208 |
| Model Year | 2000 |
| Download File |
|
| Document File Type | |
| Publisher | mbusa.com |
| Wikipedia's Page | Mercedes-Benz CLK-Class |
| Copyright | Attribution Non-commercial |
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