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owners manual Mercedes SL
owners manual Mercedes SL - year of production: 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 - Mercedes Benz SL R129 owners manual EN
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from owners manual to the vehicle Mercedes SL, year of production 1989 - 2001:
Supplemental restraint system (SRS)Emergency tensioning retractor (ETR)
Airbags are intended as a supplement to seat belts. The seat belts are equipped with emergency tensioning
Airbags alone cannot protect as well as airbags plus retractors. These tensioning retractors are located in
seat belts in impacts for which the airbags were each belt’s inertia reel and become operationally ready
designed to operate, and do not afford any protection with the key in steering lock position 1 or 2.
whatsoever in crashes for which the airbags are not The emergency tensioning retractors are designed to
designed to deploy. activate only when the seat belts are fastened during
The SRS uses two crash severity levels (thresholds) to frontal and front-angled impacts and rear impacts
activate either the emergency tensioning retractor (ETR) exceeding the first threshold of the SRS and in rear
or front airbag or both. Activation depends on the impacts exceeding a preset severity level. They remove
direction and severity of the impact exceeding the slack from the belts in such a way that the seat belts fit
preset thresholds and whether the seat belt is fastened.more snugly against the body restricting its forward
Seat belt fastened movement as much as possible.
• first threshold exceeded:In cases of other frontal impacts, rollovers, certain side
ETR activates impacts, rear collisions or other accidents without
sufficient frontal or rear impact forces, the emergency
• second threshold exceeded:tensioning retractors will not be activated. The driver
airbag also activates and passenger will then be protected by the fastened
Seat belt not fastened seat belts and inertia reel in the usual manner.
• first threshold exceeded:For seat belt and emergency tensioning retractor safety
airbag activates, but not ETRguidelines see page 66.
Driver and passenger systems operate independently of
each other.
Restraint systems 59
Instruments OperationDrivingInstrument Practical hintsCar careTechnicalIndex
and controls cluster display data
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year of production from: 1989
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Mercedes Benz SL R129 owners manual
pages 60 - 66
Mercedes Benz SL R129 owners manual
page 63 / 297
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