Seatbelt airbags Mercedes S-Class 2017/18 |
Wednesday, October 31st 2018
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Seatbelt airbags Mercedes S-Class 2017/18

Moditech Rescue Solutions BV News

In this newsletter, the seatbelt airbag is in the spotlight. This airbag has been used for some time (on a small scale), but we come across this type more and more. We will also be informing you about the presence of an extinguishing system in the engine compartment of the new Mercedes-Benz CLS and AMG GT.

More on these topics in our newsletter this month! 



  • In 1997, Renault was the first to introduce this type of seat belt.
  • In 2010, Ford launched a seatbelt airbag. The seatbelt airbags were first available in the American version of the Ford Explorer, in the front, followed later by other Ford models. This belt was optional in Europe in the Ford Mondeo.
  • Lexus fitted the seatbelt airbag as standard. In the Lexus LFA 2010, both front seats are equipped with seatbelt airbags. This is shown in the datasheet below.

Illustration: Lexus LFA 4.8 V10 2dr coupé 2010-2012

A number of vehicles equipped with seatbelt airbags have been added to the latest update of the Crash Recovery System, such as:


  • Ford Edge – 5dr SUV - 2016 - 2018
  • Mercedes – Benz S Class - 4dr saloon – 2017 - 2018
  • Mercedes Benz E Class – 4dr saloon – 2016 – 2018
  • Mercedes – Benz Maybach 4dr saloon – 2014 – 2018

CAUTION! The seatbelt airbags in these models are optional.

IMPORTANT: The seatbelt airbags are displayed in the CRS, but are not necessarily present. It is important that the first responder is able to recognise them.

Illustration: Mercedes-Benz E Class 4dr Saloon 2016-2018

Verenigde Staten:

  • Ford Expedition – 5dr SUV - 2017 – 2018
  • Ford Explorer – 5dr SUV – 2015 – 2018
  • Ford F-150 4dr pickup – 2014 – 2018

Seatbelt airbags are often fitted as standard in the US.





The gas generator (shown above) filling the airbag could be built into the seat or bodywork. By clicking on the seatbelt airbag and/or gas generator, the first responder is given important information about these components.

The seatbelt airbag can be recognised by:
In the illustrations below, the safety belts of the Mercedes-Benz E-Class 2018. Logos Beltbag on the inside and outside of the belt. This belt is thicker than the conventional belt.

Illustrations: Beltbag Logo on the inside and outside of the Mercedes-Benz E Class 4dr Saloon 2018 belt

A non-activated seatbelt with airbag can be cut through in the same way as a conventional belt. If the belt has been activated, cut through it with a pair of scissors or a knife. The activated belt expands, making it difficult to cut through the belt with a belt cutter.


The Mercedes-Benz has even more innovative safety systems. For example, an extinguishing system is installed in the CLS and AMG GT Class 2018. The extinguishing system is situated in the engine compartment. The Mercedes Inerting System prevents an explosive fire propagation. The reason Mercedes-Benz developed the system is the presence of refrigerant R1234YF in the A/C system. R1234YF gas is highly inflammable and could escape after an accident due to damage to the air conditioning system, causing it to ignite with an explosion because of the heat from the engine and exhaust.

CAUTION! Combustion of R1234YF produces caustic and toxic smoke consisting mainly of hydrofluoric acid. R1234YF ignition can be recognised by a bright flash of light.

Illustration: Mercedes-Benz Inerting System

1. Gas generator
2. Pipework
3. Atomiser

R12/69 is a pyrotechnic charge.

Illustration: Pipe from behind the mudguard

The gas generator is filled with Argon, an inert, liquefied, cryogenic gas with an asphyxiating effect (displaces oxygen). The system is activated by the SRS (Supplemental Restraint System). In the event of an accident, the SRS will activate the pyrotechnic charge, allowing the gas to flow into the gas generator. This happens under high pressure. The gas in the engine compartment is released through the piping and the atomiser and expels the oxygen, which prevents the refrigerant from igniting.

CAUTION! A leak of argon gas can cause burns on bare skin and tightness of the chest.

CAUTION! The gas generator in the Inerting System in the CLS is situated behind the right mudguard. By clicking on the gas generator, the first responder is given important information about this gas generator.

Illustration: Mercedes-Benz CLS 4dr Coupe 2018

Using rescue equipment to create space in this position can lead to a dangerous situation. It is not possible to see if the generator has been activated.

Illustration: Position of the gas generator for the CLS Class Inerting System

The SRS (Supplemental Restraint System) activates the Inerting System in the event of an accident, simultaneously with other passive safety systems such as airbags.

Illustration: Mercedes-Benz AMG GT 2018