Mercedes-Benz S-CLASS SEDAN 2023 Purpose and Function of Restraint System User Manual
Purpose and Function of the Restraint System
Overview of deployment situations (restraint system)
Make sure that the following prerequisites in particular have been met so that the components of the restraint system are able to provide the intended level of protection:
- Sit correctly (/ page 46).
- Fasten the seat belt correctly (/ page 47).
- Function of the seat belt warning lamp (/ page 49).
- Function of the rear seat belt status dis-play (/ page 49).
- The 6 restraint system warning lamp is not lit up after the self-test (/ page 48).
- The PASSENGER AIR BAG indicator lamps display the correct status of the front passenger air bag (/ page 50).
- The REAR SEAT AIR
- BAG indicator lamps dis-play the correct status of the rear air bags (/ page 52).
- Depending on the detected deployment situation, the components of the restraint system can be activated or deployed independently of each other:
- Emergency Tensioning Device: frontal impact, rear impact, side impact, rollover
- Driver’s air bag, front passenger air bag: frontal impact
- Knee bag: frontal impact
- Side impact air bag: side impact
- Window curtain air bag: side impact, rollover, frontal impact
- Rear air bag in the seat backrest of the front seat: frontal impact
- Belt air bag in the rear seat belt: frontal impact
- Cushion air bag in the reclining rear seat: frontal impact
- PRE-SAFE® Impulse Side: side impact
- The installation location of an air bag is identified by the AIRBAG symbol (/ page 64).
- Observe the information on the function of the restraint system (/ page 58).
Information on how the restraint system works
How the restraint system functions depend on the severity of the impact detected and the apparent type of accident. For more information about types of accidents, see “Overview of deployment situations” (/ page 57). The activation thresholds for the components of the restraint system are determined based on the evaluation of the sensor values measured at various points in the vehicle. This process is preemptive in nature. The triggering/deployment of the components of the restraint system must take place in good time at the start of the collision.
Factors that can be seen and measured only after a collision has occurred cannot play a decisive role in air bag deployment. Nor do they provide an indication of air bag deployment. The vehicle may be deformed significantly without an airbag being deployed. This is the case if only parts that are relatively easily deformed are affected and the rate of vehicle deceleration is not high. Conversely, an airbag may be deployed even though the vehicle suffers only minor deformation. If very rigid vehicle parts such as longitudinal members are hit, this may result in sufficiently high levels of vehicle deceleration.
Depending on the apparent type of accident and the detected deployment situation, Emergency Tensioning Devices and/or air bags supplement the protection offered by a correctly worn seat belt. When enabled, an air bag can provide additional protection for the respective vehicle occupant. Potential protection provided by each air bag:
- Knee bag: thigh, knee and lower leg
- Driver’s air bag, front passenger air bag: head and ribcage
- Window curtain air bag: head
- Side impact air bag: ribcage, also pelvis for front seat occupants
- Rear air bag: head
However, no system available today can completely eliminate injuries and fatalities in every accident situation. In particular, the seat belt and air bag generally do not protect against objects penetrating the vehicle from the outside. It is also not possible to completely rule out the risk of injury caused by the air bag deploying. Mercedes Benz recommends that you have the vehicle towed to a qualified specialist workshop after an accident. Take this into account, particularly if a Emergency Tensioning Device is triggered or an air bag deployed.
If the Emergency Tensioning Devices are triggered or an air bag is deployed, you will hear a bang, and a small amount of powder may also be released:
- The bang will not generally affect your hearing.
- In general, the powder released is not hazardous to health but may cause short-term breathing difficulties to persons suffering from as theme or other pulmonary conditions. Provided it is safe to do so, leave the vehicle immediately or open the window in order to prevent breathing difficulties.
- Airbags and pyrotechnic Emergency Tensioning Devices contain perchlorate material, which may require special handling or environmental protection measures. National guidelines regarding waste disposal must be observed. In California, see https://dtsc.ca.gov/.
- Using the search function, you will find information on perchlorate,
Information on the limited protection provided by the restraint system
- Risk due to the incorrect behavior of vehicle occupants
- Every vehicle occupant must make sure of the following in particular:
- They observe the information on the correct seat position (/ page 46).
- There are no heavy, sharp-edged or fragile objects in the pockets of their clothing.
- Store such objects in a suitable place.
Risk of injury or death due to an incorrect seat position The seat belt does not offer the intended level of protection if you have not moved the seat backrest to an almost vertical position.
In particular, you could slip beneath the seatbelt and become injured.
- Adjust the seat properly before beginning your journey.
- Always ensure that the seat backrest is in an almost vertical position and that the shoulder belt is routed across the center of your shoulder.
- Risk due to objects in the vehicle interior Every vehicle occupant must make sure of the following in particular:
- They observe the information on the correct seat position (/ page 46).
- There are no objects between the seat, door and door pillar (B pillar).
- There are no hard objects, e.g. coat hangers, hanging on the grab handles or coat hooks.
- There are no heavy, sharp-edged or fragile objects in the pockets of their clothing. Store such objects in a suitable place.
Risk of injury or death due to a blocked seat belt buckle or seat belt anchorage Objects next to the front seat that block the seat belt buckle or the moving seat belt anchorage on the front seat impair the function of the Emergency Tensioning Devices.
- Before starting the journey, make sure that there are no objects around the seat belt buckle or between the front seat and door.
The risk of injury from objects in the deployment area of an airbag can hinder or prevent the correct deployment of the airbag. The airbag may then deploy in an uncontrolled manner and may even cause additional injuries to the vehicle occupants by deploying. This may be the case in particular if the airbag is integrated into the seat.
- Always stow and secure objects correctly.
- Before commencing your journey, make
sure that no objects are stowed in the deployment area of an airbag.
- The installation location of an airbag is identified by the AIRBAG (/ page 64) symbol.
Observe the following information:
- Notes on loading the vehicle (/ page 142)
- Information on the rear airbag in the seat backrest of the front seat (/ page 65)
- Risk due to installing accessories
- Do not attach accessories such as mobile navigation devices, mobile phones, or cup holders, within the deployment area of an airbag, e.g. on the cockpit, on the door, on the side window or on the side trim.
- In addition, no connecting cables, tensioning straps or retaining straps must be routed or attached to the vehicle within the deployment area of an airbag.
- Always comply with the accessory manufacturer’s installation instructions and, in particular, the notes on suitable places for installation.
The risk of injury or death due to unsuitable protective covers means that airbags can no longer protect vehicle occupants as they are designed to do.
- Use only protective covers approved by Mercedes Benz for the seat in question.
In addition, the function of the automatic passenger airbag deactivation may be restricted by an unsuitable protective cover. If the front passenger seat is occupied, ensure that the PASSENGER AIR BAG indicator lamps display the correct status of the front passenger airbag (/page 50).
Risk due to pets in the vehicle interior
Risk of accident and injury due to animals left unsecured or unattended in the vehicle
- If you leave animals in the vehicle unattended or unsecured, they could possibly press buttons or switches.
An animal may:
- Activate vehicle equipment and become trapped, for example
- Switch systems on or off and endanger other road users
- Unsecured animals may be thrown around in the vehicle in the event of an accident or sudden steering and braking maneuvers and injure vehicle occupants in the process.
- Never leave animals in the vehicle unattended.
- Always correctly secure animals while driving, e.g. using a suitable animal carrier.
Risk due to modification, damage or wear to the components of the restraint system
Risk of injury or death due to modifications to the restraint system
Vehicle occupants may no longer be protected as intended if alterations are made to the restraint system.
- Never alter the parts of the restraint system.
- Never tamper with the wiring or any electronic component parts or their software.
If it is necessary to modify the vehicle to accommodate a person with disabilities, contact an authorized Mercedes Benz Center for details.
USA only: for details, contact our Customer Assistance Center on 1-800-FOR-MERCedes (1‑800‑367‑6372).
Risk of injury or death due to damaged or modified seat belts
Seat belts cannot provide protection in the following situations:
- The seat belt is damaged, has been modified, is extremely dirty, bleached or dyed
- The seat belt buckle is damaged or extremely dirty
- Modifications have been made to the Emergency Tensioning Device, seat belt anchorage or seat belt retractor
Seat belts may sustain non-visible damage in an accident, e.g. due to glass splinters. Modified or damaged seat belts could tear or fail in the event of an accident, for example. Modified Emergency Tensioning Devices could accidentally trigger or fail to function as intended.
- Never modify the seat belt system, for example, the seat belt, seat belt buckle, Emergency Tensioning Device, seat belt anchorage and seat belt retractor.
- Make sure that the seat belts are undamaged, not worn and clean.
- Always have the seat belts checked immediately after an accident at a qualified specialist workshop.
Use only seat belts that have been approved for your vehicle by Mercedes Benz.
Risk of injury due to modifications to the cover of an airbag
- If you change the cover of an airbag or attach objects, e.g. even stickers, to it, the airbag may no longer function as intended.
- Never modify the cover of an airbag.
- Do not attach any objects to the cover.
The installation location of an airbag is identified by the airbag symbol (/ page 64).
Risk of injury due to a damaged rear airbag cover If a rear airbag cover is damaged, the rear airbag can no longer function correctly and can even cause additional injuries when deployed.
- Before starting a journey, make sure the covers for the rear airbags are not damaged. If a rear airbag cover is damaged, disable the rear airbag. Have a damaged rear airbag cover replaced at a qualified specialist workshop as soon as possible.
- You can disable or enable the rear airbag via the multimedia system (/ page 53).
- Observe the information on the rear airbag in the seat backrest of the front seat (/ page 65)
Risk of injury due to malfunctioning sensors in the door The function of the airbags can be impaired due to modifications or incorrect work performed on the doors or door trim, or if the doors are damaged.
- Never modify the doors or parts of the doors.
- Always have work on the doors or door trim carried out at a qualified specialist workshop.
- Risk due to components of the restraint system that have already been deployed Mercedes Benz recommends that you have the vehicle towed to a qualified specialist workshop after an accident.
Risk of burns from hot air bag components The airbag parts are hot after an airbag has been deployed.
- Do not touch the airbag parts.
- Have a deployed airbag replaced at a qualified specialist workshop as soon as possible.
Risk of injury due to deployed airbag A deployed airbag no longer offers any protection.
- Has the vehicle been towed to a qualified
- specialist workshop in order to have the deployed airbag replaced?
- Have deployed airbags replaced immediately.
Risk of injury or death from deployed pyrotechnic Emergency Tensioning Devices that have been deployed are no longer operational and are unable to perform their intended protective function.
- Therefore, have deployed pyrotechnic Emergency Tensioning Devices immediately replaced at a qualified specialist workshop.
Mercedes-Benz 2023 Top Accessories
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