2001 Mercedes SLK-Class Owner's Manual - Page 55

2001 Mercedes SLK-Class Manual

Page 55 highlights

Instruments and controls Operation Driving Instrument cluster display 52 Practical hints Car care Technical data Index Restraint systems Supplemental restraint system (SRS) 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 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 • first threshold exceeded: ETR activates • second threshold exceeded: airbag also activates Seat belt not fastened • first threshold exceeded: airbag activates, but not ETR Driver and passenger systems operate independently of each other. Emergency tensioning retractor (ETR) The seat belts are equipped with emergency tensioning retractors. These tensioning retractors are located in each belt's inertia reel and become operationally ready with the 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 and front-angled impacts and rear 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. In cases of other frontal impacts, roll-overs, certain side impacts, rear collisions or other accidents without sufficient frontal or rear impact forces, the emergency tensioning retractors will not be activated. The driver and passenger 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 60.

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52
Restraint systems
Technical
data
Instruments
and controls
Operation
Driving
Instrument
cluster display
Practical hints
Car care
Index
Supplemental restraint system (SRS)
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 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
first threshold exceeded:
ETR activates
second threshold exceeded:
airbag also activates
Seat belt not fastened
first threshold exceeded:
airbag activates, but not ETR
Driver and passenger systems operate independently of
each other.
Emergency tensioning retractor (ETR)
The seat belts are equipped with emergency tensioning
retractors. These tensioning retractors are located in
each belt’s inertia reel and become operationally ready
with the 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 and front-angled impacts and rear 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.
In cases of other frontal impacts, roll-overs, certain side
impacts, rear collisions or other accidents without
sufficient frontal or rear impact forces, the emergency
tensioning retractors will not be activated. The driver
and passenger 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 60.