Mersedes SUV Manuals

Occupant safety

Mercedes-Benz M-Class / Mercedes-Benz M-Class Owners Manual / Safety / Occupant safety

Overview of occupant safety

In this section, you will learn the most important facts about the restraint system components of the vehicle.

The restraint system consists of: - seat belts
- child restraint systems - LATCH-type (ISOFIX) child seat anchors

Additional protection is provided by: - SRS (Supplemental Restraint System) - PRE-SAFE
- Air bag system components with:     - PASSENGER AIR BAG OFF indicator lamp     - front-passenger seat with Occupant Classification System (OCS)

The different air bag systems work independently of each other. The protective functions of the system work in conjunction with each other. Not all air bags are deployed in an accident.

Modifications to or work improperly WARNING
Modifications to or work improperly conducted on restraint system components or their wiring, as well as tampering with interconnected electronic systems, can lead to the restraint systems no longer functioning as intended.

Air bags or Emergency Tensioning Devices (ETDs), for example, could deploy inadvertently or fail to deploy in accidents although the deceleration threshold for air bag deployment is exceeded. Therefore, never modify the restraint systems. Do not tamper with electronic components or their software.

for more information on See "Children in the vehicle"
for more information on infants and children traveling with you in the vehicle and restraints for infants and children.

SRS (Supplemental Restraint System)

Introduction

SRS consists of:
- the - air bags SRS warning lamp
- air bags
- air bag control unit (with crash sensors) - Emergency Tensioning Devices for the front seat belts and the outer seat belts in the rear
- belt force limiters

SRS reduces the risk of occupants coming into contact with the vehicle's interior in the event of an accident. It can also reduce the effect of the forces to which occupants are subjected during an accident.

SRS warning lamp

SRS functions are checked regularly when you switch on the ignition and when the engine is running. Therefore, malfunctions can be detected in good time.

The instrument SRS warning lamp in the
instrument cluster lights up when the ignition is switched on. It goes out no later than a few seconds after the engine is started.

The SRS components are in operational readiness when the is not lit while the engine is running. SRS warning lamp
is not lit while the engine is running.

The SRS self-check has detected a WARNING
The SRS self-check has detected a malfunction if the

warning lamp: SRS
warning lamp:
- does not come on at all - fails to go out approximately 4 seconds after the engine was started - comes on after the engine was started or while driving
For your safety, Mercedes-Benz strongly recommends that you have the system checked as soon as possible at an authorized Mercedes-Benz Center. Otherwise the SRS may not be activated when it is needed in an accident, which could result in serious or fatal injury. The SRS might also deploy unexpectedly and unnecessarily which could also result in injury.

In addition, improper work on the SRS creates a risk of rendering the SRS inoperative or causing unintended air bag deployment. Work on the SRS must therefore only be performed by qualified technicians. Contact an authorized Mercedes-Benz Center.

If it is necessary to modify an air bag system to accommodate a person with disabilities, contact an authorized Mercedes-Benz Center for details. USA only: Call our Customer Assistance Center at 1-800-FOR-MERCedes (1-800-367-6372) for details.

Safety guidelines for seat belts, Emergency Tensioning Devices (ETDs) and air bags

- Damaged seat belts or seat belts that have WARNING
- Damaged seat belts or seat belts that have been subjected to stress in an accident must be replaced. Their anchoring points must also be checked. Only use seat belts installed or supplied by an authorized Mercedes-Benz Center.

- Air bags and pyrotechnic Emergency Tensioning Devices (ETDs) contain perchlorate material, which may require special handling and regard for the environment. Check your national disposal guidelines. California residents, see www.dtsc.ca.gov/HazardousWaste/Perchlorate/index.cfm.

- Air bags and ETDs are designed to function on a one-time-only basis. An air bag or ETD that has deployed must be replaced. PRESAFE has electrically operated reversible belt tensioners in addition to the pyrotechnic ETDs.

- Do not pass seat belts over sharp edges.

They could tear.

- Do not make any modification that could change the effectiveness of the seat belts.

- Do not bleach or dye seat belts as this may severely weaken them. In a crash they may not be able to provide adequate protection.

- No modifications of any kind may be made to any components or wiring of the SRS.

- Do not change or remove any component or part of the SRS.

- Do not install additional trim material, seat covers, badges, etc. to the:     - padded steering wheel boss     - knee bag covers     - front-passenger air bag cover     - outer side of front seat bolsters     - outer side of rear bench seat backrest seat bolsters     - roof lining trim - Do not install additional electrical/electronic equipment on or near SRS components and wiring.

- Keep area between air bags and occupants free of objects (e.g. packages, purses, umbrellas, etc.).

- Do not hang items such as coat hangers from the coat hooks or handles over the door. These items may be thrown around in the vehicle and cause head and other injuries when the window curtain air bag is deployed.

- Air bag system components will be hot after an air bag has inflated. Do not touch them.

- Never place your feet on the instrument panel, dashboard, or on the seat. Always keep both feet on the floor in front of the seat.

- Improper repair work on the SRS creates a risk of rendering the SRS inoperative or causing unintended air bag deployment.

Work on the SRS must therefore only be performed by qualified technicians.

Contact an authorized Mercedes-Benz Center.

- For your protection and the protection of others, when scrapping the air bag unit or ETD, our safety instructions must be followed. These instructions are available from any authorized Mercedes-Benz Center.

- Given the considerable deployment speed, required inflation volume, and the material of the air bags, there is the possibility of abrasions or other, potentially more serious injuries resulting from air bag deployment.

If you sell your vehicle, Mercedes-Benz strongly recommends that you inform the subsequent owner that the vehicle is equipped with SRS. Also, refer them to the applicable section in the Operator's Manual.

Air bags

Important safety notes

Air bags are designed to reduce the incidence WARNING
Air bags are designed to reduce the incidence of injuries and fatalities in certain situations: - frontal impacts (driver's and frontpassenger front air bags and driver's knee bag)
- side impacts (side impact air bags and window curtain air bags) - rollover (window curtain air bags) However, no system available today can completely eliminate injuries and fatalities.

When the air bags are deployed, a small amount of powder is released. The powder generally does not constitute a health hazard and does not indicate that there is a fire in the vehicle. In order to prevent potential breathing difficulties, you should leave the vehicle as soon as it is safe to do so. If you have any breathing difficulty but cannot get out of the vehicle after the air bag inflates, then get fresh air by opening a window or door.

To reduce the risk of injuries during front air WARNING
To reduce the risk of injuries during front air bag inflation, the driver and front-passenger must always be seated correctly and have their seat belts fastened accordingly.

For maximum protection in the event of a collision, you must always be in the normal seat position with your back against the backrest. Fasten your seat belt and make sure that it is correctly positioned on your body.

Since the air bag inflates with considerable speed and force, a proper seating position and correct positioning of the hands on the steering wheel will help to keep you at a safe distance from the air bag. Occupants who are not wearing their seat belt, are not seated properly or are too close to the air bag can be seriously injured or killed by an air bag as it inflates with great force instantaneously: - Sit with the seat belt properly fastened in a position that is as upright as possible with your back against the seat backrest.

- Move the driver's seat as far back as possible, still permitting proper operation of vehicle controls. The distance from the center of the driver's chest to the center of the air bag cover on the steering wheel must be at least 10 inches (25 cm) or more.

You should be able to accomplish this by adjusting the seat and steering wheel. If you have any difficulties, please contact an authorized Mercedes-Benz Center.

- Do not lean your head or chest close to the steering wheel or dashboard.

- Only hold the steering wheel by the rim.

Placing hands and arms inside the rim can increase the risk and potential severity of hand/arm injury when the driver front air bag inflates.

- Adjust the front-passenger seat as far back as possible from the dashboard when the seat is occupied.

- Occupants, especially children, should never place their bodies or lean their heads in the area of the door where the side impact air bag inflates. This could result in serious injuries or death should the side impact air bag be deployed. Always sit as upright as possible, wear the seat belt properly and use an appropriately sized child restraint, infant restraint or booster seat recommended for the size and weight of the child.

Failure to follow these instructions can result in severe injuries to you or other occupants.

If you sell your vehicle, it is important that you make the buyer aware of this safety information. Be sure to give the buyer this Operator's Manual.

Accident research shows that the safest place WARNING
Accident research shows that the safest place for children in an automobile is in a rear seat.

A side impact air bag related injury may occur if occupants, especially children, are not properly seated or restrained when next to a side impact air bag which needs to deploy rapidly in a side impact in order to do its job.

To help avoid the possibility of injury, please follow these guidelines: (1) Always sit as upright as possible and use the seat belts properly.

Make sure that children 12 years old and under use an appropriately sized child restraint, infant restraint, or booster seat recommended for the size and weight of the child.

(2) Always wear seat belts properly.

The air bags are only deployed if the air bag control unit detects the need for deployment.

Only in the event of such a situation will they provide their supplemental protection.

The driver and passenger should always wear their seat belts. Otherwise, it is not possible for the air bags to provide their supplemental protection.

In the event of other types of impacts and impacts below air bag deployment thresholds, the air bags will not deploy. The driver and passengers will then be protected to the extent possible by a properly fastened seat belt. A properly fastened seat belt is also needed to provide the best possible protection in a rollover.

Air bags provide additional protection; they are not, however, a substitute for seat belts.

All vehicle occupants must fasten their seat belts regardless of whether your vehicle is equipped with air bags or not.

It is important for your safety and that of your passenger to have deployed air bags replaced and to have any malfunctioning air bags repaired. This will help to make sure the air bags continue to perform their protective function for the vehicle occupants in the event of a crash.

Front air bags

The front air bags increase protection for the driver's and front-passenger's head and chest.

Driver's air bag 1 deploys in front of the


Driver's air bag 1 deploys in front of the steering wheel; front-passenger front air bag 2 deploys in front of and above the glove box.

They are deployed:
- in the event of certain frontal impacts - if the system determines that air bag deployment can offer additional protection to that provided by the seat belt - if the seat belt is fastened - independently of other air bags in the vehicle

If the vehicle overturns, the front air bags are generally not deployed unless the system detects high vehicle deceleration in a longitudinal direction.

Your vehicle has adaptive, two-stage front air bags. In the event of a collision, the air bag control unit evaluates the vehicle deceleration. In the first deployment stage, the front air bag is filled with enough propellant gas to reduce the risk of injuries.

The front air bag is fully deployed if a second deployment threshold is exceeded within a few milliseconds.

The deployment of the front-passenger front air bag is also influenced by the weight category of the front passenger, which is determined by the Occupant Classification System (OCS).

The lighter the passenger side occupant, the higher the vehicle deceleration rate required (predicted at the start of the impact) for second stage inflation of the front-passenger front air bag. In the second stage, the front air bags are inflated with the maximum amount of propellant gas available.

The front air bags are not deployed in situations where a low impact severity is predicted. You will then be protected by the fastened seat belt.

The front-passenger front air bag will only deploy if:
- the system, based on the OCS weight sensor readings, detects that the frontpassenger seat is occupied.

- the console is not lit. indicator lamp in the center
console is not lit.

- the air bag control unit predicts a high impact severity.

Driver's knee bag

Driver's knee bag 1 provides additional


Driver's knee bag 1 provides additional protection for the driver against: - knee injuries
- thigh injuries
- lower leg injuries

Driver's knee bag 1 deploys below the steering wheel. During a frontal impact, if the system determines that air bag deployment can offer additional protection to that provided by the seat belt, driver's knee bag 1 is deployed along with the driver's air bag. The driver's knee bag 1 operates best in conjunction with a properly positioned and fastened seat belt.

Side impact air bags

The pressure sensors for side impact air bag WARNING
The pressure sensors for side impact air bag control are located in the doors. Do not modify any components of the doors or door trim panels including, for example, the addition of door speakers.

Improper repair work on the doors or the modification or addition of components to the doors create a risk of rendering the side impact air bags inoperative or causing unintended air bag deployment. Work on the doors must therefore only be performed by qualified technicians. Contact an authorized Mercedes-Benz Center.

Only use seat covers which have been tested WARNING
Only use seat covers which have been tested and approved by Mercedes-Benz for your vehicle model. Using other seat covers may interfere with or prevent the deployment of the side impact air bags. Contact an authorized Mercedes-Benz Center for availability.

When deployed, the side impact air bags offer additional protection for the thorax and pelvis of the vehicle occupants on the side of the vehicle on which the impact occurs. However, they do not protect the: - head
- neck
- arms

Front side impact air bags 1 and rear side


Front side impact air bags 1 and rear side impact air bags 2 deploy next to the outer seat cushions.

The side impact air bags are deployed: - on the side on which an impact occurs - at the start of an accident with a high rate of lateral vehicle deceleration or acceleration, e.g. in a side impact - independently of seat belt use - independently of the front air bags - independently of the ETDs

If the vehicle overturns, the side impact air bags are generally not deployed. They are deployed if the system detects high vehicle deceleration or acceleration in a lateral direction and determines that side impact air bag deployment can offer additional protection to that provided by the seat belt.

Side impact air bags will not deploy in side impacts which do not exceed the system's preset deployment thresholds for lateral acceleration/deceleration. You will then be protected by the fastened seat belt.

If the OCS detects that the front-passenger seat is not occupied and the front-passenger seat belt is not fastened (the belt tongue is not engaged in the seat belt buckle), the side impact air bag on the front-passenger side will not deploy. The side impact air bag on the front-passenger side will deploy if the frontpassenger seat belt is fastened, regardless of whether the front-passenger seat is occupied or not.

Window curtain air bags

The window curtain air bags enhance the level of protection for the head, but not chest or arms, of the vehicle occupants on the side of the vehicle on which the impact occurs.

The window curtain air bags are integrated into the side of the roof frame and deploy in the area from the A-pillar to the C-pillar.

Window curtain air bags 1 are deployed:


Window curtain air bags 1 are deployed: - on the side on which an impact occurs - at the start of an accident with a high rate of lateral vehicle deceleration or acceleration, e.g. in a side impact - regardless of whether the front-passenger seat is occupied
- independently of seat belt use - if the vehicle overturns and the system determines that window curtain air bag deployment can offer additional protection to that provided by the seat belt - independently of the front air bags

Window curtain air bags 1 will not deploy in impacts with deceleration rates which do not exceed the system's preset deployment thresholds for vehicle deceleration or acceleration. You will then be protected by the fastened seat belt.

Occupant Classification System (OCS)

How the occupant classification system works

The Occupant Classification System (OCS) categorizes the occupant on the frontpassenger seat by means of a weight sensor.

The front-passenger front air bag is deactivated automatically for certain weight categories. The shows you the current status. If the indicator lamp
shows you the current status. If the front-passenger front air bag is deactivated. indicator lamp is illuminated, the
front-passenger front air bag is deactivated.

The system does not deactivate: - the side impact air bag - the window curtain air bag - the Emergency Tensioning Devices

To be classified correctly, the front passenger must sit:
- with the seat belt fastened correctly - in a position that is as upright as possible with their back against the seat backrest
- with their feet on the floor

If the front-passenger's weight is transferred to another object in the vehicle (e.g. by leaning on armrests), OCS may not be able to approximate the occupant's weight category.

If the front-passenger seat, the seat cover or the seat cushion are damaged, have the necessary repair work carried out at an authorized Mercedes-Benz Center.

For safety reasons, Mercedes-Benz recommends that you only use seat accessories which have been approved by Mercedes-Benz.

Both the driver and the passenger should always use the an indication of whether or not the passenger indicator lamp as
an indication of whether or not the passenger is properly positioned.

If the  indicator lamp WARNING
If the

illuminates indicator lamp
illuminates when an adult or someone larger than a small individual is in the front passenger seat, have the front passenger reposition himself or herself in the seat until the

indicator lamp goes out.
indicator lamp goes out.

In the event of a collision, the air bag control unit will not allow front passenger front air bag deployment when the OCS has classified the front passenger seat occupant as weighing as much as or less than a typical 12-month-old child in a standard child restraint or if the front passenger seat is classified as being empty.

When the OCS senses that the front passenger seat occupant is classified as being up to or less than the weight of a typical 12-month-old child in a standard child restraint, the

lamp will indicator
lamp will illuminate when the engine is started and remain illuminated. This indicates that the front passenger front air bag is deactivated.

When the OCS senses that the front passenger seat is classified as being empty, the

illuminate indicator lamp will
illuminate when the engine is started and remain illuminated. This indicates that the front passenger front air bag is deactivated.

When the OCS senses that the front passenger seat occupant is classified as being heavier than the weight of a typical 12- month-old child seated in a standard child restraint or as being a small individual (such as a young teenager or a small adult), the

illuminate for indicator lamp will
illuminate for approximately 6 seconds when the engine is started. Depending on occupant weight sensor readings from the seat, it will then remain illuminated or go out. With the

the indicator lamp illuminated,
the front passenger front air bag is deactivated.

With the

the indicator lamp out,
the front passenger front air bag is activated.

When the OCS senses that the front passenger seat occupant is classified as an adult or someone larger than a small individual, the

lamp will indicator
lamp will illuminate for approximately six seconds when the engine is started and then go out.

This indicates that the front passenger front air bag is activated.

If the

illuminated, indicator lamp is
illuminated, the front passenger front air bag is deactivated and will not be deployed.

If the

illuminated, the front passenger front air bag indicator lamp is not
illuminated, the front passenger front air bag is activated and will be deployed - in the event of certain frontal impacts - if the impact exceeds a predetermined triggering threshold - independent of the side impact air bag or pelvis air bag If the front passenger front air bag is deployed, the rate of inflation will be influenced by
- the rate of vehicle deceleration as assessed by the air bag control unit - the front passenger's weight category as identified by the OCS

For further information, see "Air bag display messages".

According to accident statistics, children are WARNING
According to accident statistics, children are safer when properly restrained on the rear seats than on the front-passenger seat. Thus, we strongly recommend that children be placed in the rear seats whenever possible.

Regardless of seating position, children 12 years old and under must be seated and properly secured in an appropriate infant restraint, toddler restraint, or booster seat recommended for the size and weight of the child.

The infant or child restraint must be properly secured with the vehicle's seat belt, the seat belt and Top Tether strap, or lower anchors and Top Tether strap, fully in accordance with the child seat manufacturer's instructions.

Occupants, especially children, should always sit as upright as possible, wear the seat belt properly and use an appropriately sized infant restraint, toddler restraint, or booster seat recommended for the size and weight of the child.

Children can be killed or seriously injured by an inflating air bag. Note the following important information when circumstances require you to place a child in the frontpassenger seat:
- Your vehicle is equipped with air bag technology designed to deactivate the front-passenger front air bag in your vehicle when the system senses the weight of a typical 12-month-old child or less along with the weight of a standard appropriate child restraint on the front-passenger seat.

-  A child in a rear-facing child restraint on the front-passenger seat will be seriously injured or even killed if the front-passenger front air bag inflates in a collision which could occur under some circumstances, even with the air bag technology installed in your vehicle. The only means to eliminate this risk completely is never to place a child in a rear-facing child restraint in the frontpassenger seat. We therefore strongly recommend that you always place a child in a rear-facing child restraint on the rear seat.

- If you install a rear-facing child restraint on the front-passenger seat, make sure the

illuminated, indicator lamp is
illuminated, indicating that the front-passenger front air bag is deactivated. Should the

indicator lamp not illuminate or go out while
indicator lamp not illuminate or go out while the restraint is installed, please check installation. Periodically check the

to indicator lamp while driving
to make sure that the

lamp is illuminated. If the indicator
lamp is illuminated. If the

indicator lamp goes out or remains out, do
indicator lamp goes out or remains out, do not transport a child on the front-passenger seat until the system has been repaired.

A child in a rear-facing child restraint on the front-passenger seat will be seriously injured or even killed if the front-passenger front air bag inflates.

- If you place a child in a forward-facing child restraint on the front-passenger seat:     - move the seat as far back as possible     - use the proper child restraint recommended for the age, size and weight of the child     - secure child restraint with the vehicle's seat belt according to the child seat manufacturer's instructions - For children larger than the typical 12- month-old child, the front-passenger front air bag may or may not be activated.

If the driver's air bag deploys, this does not mean that the front-passenger front air bag also has to deploy.

The OCS may have detected that the seat: - was empty or occupied by a person with a weight of up to or less than that of a typical 12-month-old child seated in a standard child restraint
- was occupied by a small individual, such as a young teenager or a small adult - was occupied by a child in a child restraint system, whose weight is greater than that of a typical 12-month-old child.

These are examples of when the OCS deactivates the front-passenger front air bag.

Deactivation takes place although the collision fulfills the criteria for deploying the driver's air bag.

If the SmartKey has been removed from the


If the SmartKey has been removed from the ignition lock or is in position 0, indicator lamp WARNING does not light up.


If the red  SRS warning lamp in the WARNING
If the red instrument cluster and the SRS warning lamp in the
instrument cluster and the indicator lamp light up simultaneously, the
indicator lamp light up simultaneously, the OCS is malfunctioning. The front passenger front air bag will be deactivated in this case.

Have the system checked by qualified technicians as soon as possible. Contact an authorized Mercedes-Benz Center.

Only have the seat repaired or replaced at an authorized Mercedes-Benz Center.

In order to ensure proper operation of the air bag system and OCS:
- Sit with the seat belt properly fastened in a position that is as upright as possible with your back against the seat backrest.

- When seated, a passenger should not position him/herself in such a way as to cause the passenger's weight to be lifted from the seat cushion as this may result in the OCS being unable to correctly approximate the passenger's weight category.

- Read and observe all warnings in this chapter.

System self-test

If an adult occupant is properly sitting on the passenger seat and the OCS classifies the occupant as an adult, the lamp illuminates and goes out again after indicator
lamp illuminates and goes out again after approximately 6 seconds.

If the seat is not occupied and the OCS classifies the front passenger seat as being unoccupied, the will illuminate and not go out. indicator lamp
will illuminate and not go out.

If the  indicator lamp does WARNING
If the

not indicator lamp does
not illuminate, the system is not functioning. You must contact an authorized Mercedes-Benz Center before seating any child on the front passenger seat.

For more information, see "Problems with the Occupant Classification System".

Never place anything between seat cushion WARNING
Never place anything between seat cushion and child seat (e.g. a pillow), since it reduces the effectiveness of the OCS. The underside and rear side child restraint system must be placed entirely on the seat cushion and the backrest of the front-passenger seat backrest.

If necessary, adjust the tilt of the passenger seat backrest.

An incorrectly mounted child seat could cause injuries to the child in case of an accident, instead of increasing protection for the child.

Follow the manufacturer's instructions for installation of child restraint systems.

Problems with the occupant classification system


Problem

Possible causes/consequences and Solutions

The illuminates and remains illuminated. indicator lamp
illuminates and remains illuminated.

The person on the front-passenger seat: - has the weight of a typical adult - has been determined by the system not to be a child.

The OCS is malfunctioning.

- Have the OCS checked as soon as possible at an authorized Mercedes-Benz Center.

- Observe the additional display messages in the multifunction display.

If the  indicator lamp WARNING
If the

illuminates and remains illuminated when the weight of a typical indicator lamp
illuminates and remains illuminated when the weight of a typical adult or someone larger than a small individual has been detected on the passenger seat, do not allow any occupant to use the passenger seat until the system has been repaired.


Problem

Possible causes/consequences and Solutions

The not illuminate and/or does not remain illuminated. indicator lamp does
not illuminate and/or does not remain illuminated.

The front-passenger seat is: - unoccupied
- occupied with a weight up to or less than a typical 12-month-old child in a standard child restraint system

The OCS is malfunctioning.

- Make sure there is nothing between the seat cushion and the child seat.

- Check the installation of the child restraint system.

- Make sure that no objects are applying additional weight onto the seat.

- If the does not illuminate, have the OCS checked as soon as possible at an indicator lamp
does not illuminate, have the OCS checked as soon as possible at an authorized Mercedes-Benz Center. Do not transport a child on the front-passenger seat as long as the OCS is not functioning.

- Observe the additional display messages in the multifunction display.

If the  indicator lamp does WARNING
If the

not illuminate or remains out with the weight of a typical indicator lamp does
not illuminate or remains out with the weight of a typical 12-month-old child in a standard child restraint or less, or is unoccupied, on the front-passenger seat, do not transport a child on the front-passenger seat until the system has been repaired.

PRE-SAFE (preventative occupant protection)

The PRE-SAFE system reduces the impact of WARNING
The PRE-SAFE system reduces the impact of an accident on vehicle occupants, as long as their seat belts have been fastened correctly.

Although your vehicle is equipped with a PRESAFE system, the possibility of injury in the event of an accident cannot be ruled out. You should therefore always drive carefully and adapt your driving style to the prevailing road, weather and traffic conditions.

PRE-SAFE takes preemptive measures to protect occupants in certain hazardous situations.

PRE-SAFE intervenes: - in emergency braking situations, e.g. if BAS is activated or, in vehicles with DISTRONIC PLUS, BAS PLUS intervenes powerfully - if the radar sensor system detects an imminent danger of collision in certain situations (on vehicles with DISTRONIC PLUS)
- in critical driving situations, e.g. when physical limits are exceed and the vehicle understeers or oversteers severely

PRE-SAFE takes the following measures depending on the hazardous situation detected:
- the front seat belts are pre-tensioned.

- on vehicles with memory function for the front-passenger seat: the front-passenger seat is adjusted if it is in an unfavorable position.

- if the vehicle skids, the sliding sunroof/panorama roof with power tilt/sliding panel and the side windows are closed so that only a small gap remains.

If the sliding sunroof, panorama roof with power tilt/sliding panel or a side window is obstructed during closing, the closing procedure is stopped. The obstructed sliding sunroof, panorama roof with power tilt/ sliding panel or side window opens again slightly.

If the hazardous situation passes without resulting in an accident, PRE-SAFE slackens the belt pretensioning. All settings made by PRE-SAFE can then be reversed.

If the seat belts are not released: - Move the backrest or seat back slightly, but only when the vehicle is stationary.

The belt pretensioning is reduced and the locking mechanism is released.

Make sure that nobody can become trapped WARNING
Make sure that nobody can become trapped as you adjust the seat.

objects in the Make sure that there are no
objects in the footwell or behind the seats when resetting the seats. There is a risk that the seats and/or the objects could be damaged.

More information about seat-belt adjustment, a convenience function integrated into PRE-SAFE, can be found in the "Seat-belt adjustment" section.

Seat belts

Important safety notes

The use of seat belts and infant and child restraint systems is required by law in all 50 states, the District of Columbia, the U.S.

territories and all Canadian provinces.

Even where this is not the case, all vehicle occupants should have their seat belts fastened when the vehicle is in motion.

For further information on infants and children traveling in the vehicle and on infant and child restraint systems, see "Children in the vehicle".

infants and For further information on
infants and children traveling in the vehicle and on infant and child restraint systems, see "Children in the vehicle".

Always fasten your seat belt before driving off. WARNING
Always fasten your seat belt before driving off.

Always make sure all of your passengers are properly restrained. You and your passengers should always wear seat belts.

Failure to wear and properly fasten and position your seat belt greatly increases your risk of injuries and their likely severity in an accident.

If you are ever in an accident, your injuries can be considerably more severe without your seat belt properly buckled. Without your seat belt buckled, you are much more likely to hit the interior of the vehicle or be ejected from it. You can be seriously injured or killed.

In the same crash, the possibility of injury or death is lessened if you are properly wearing your seat belt. The air bags can only protect as intended if the occupants are properly wearing their seat belts.

Never ride in a moving vehicle with the seat WARNING
Never ride in a moving vehicle with the seat backrest in an excessively reclined position as this can be dangerous. You could slide under the seat belt in a collision. If you slide under it, the seat belt would apply force at the abdomen or neck. That could cause serious or even fatal injuries. The seat backrest and seat belt provide the best restraint when the wearer is in a position that is as upright as possible and the seat belt is properly positioned on the body.

Never let more people ride in the vehicle than WARNING
Never let more people ride in the vehicle than there are seat belts available. Make sure everyone riding in the vehicle is correctly restrained with a separate seat belt. Never use a seat belt for more than one person at a time.

Damaged seat belts or seat belts that have WARNING
Damaged seat belts or seat belts that have been subjected to stress in an accident must be replaced and their anchoring points must also be checked.

Only use seat belts which have been approved by Mercedes-Benz.

Do not make any modifications to the seat belts. This can lead to unintended activation of the ETDs or to their failure to activate when necessary.

Do not bleach or dye seat belts as this may severely weaken them. In a crash they may not be able to provide adequate protection.

Have all work carried out only by qualified technicians. Contact an authorized Mercedes-Benz Center.

Correct use of the seat belts

USE SEAT BELTS PROPERLY WARNING
USE SEAT BELTS PROPERLY
- Seat belts can only work when used properly. Never wear seat belts in any other way than as described in this section, as that could result in serious injuries in the event of an accident.

- Each occupant should wear their seat belt at all times, because seat belts help reduce the likelihood of and potential severity of injuries in accidents, including rollovers.

The integrated restraint system includes SRS (driver front air bag, driver's side knee bag, front-passenger front air bag, side impact air bags, window curtain air bags for the side windows), Emergency Tensioning Devices, seat belt force limiters, and front seat knee bolsters.

The system is designed to enhance the protection offered to properly belted occupants in certain frontal (front air bags, driver's side knee bag and ETDs) and side (side impact air bags, window curtain air bags, and ETDs) impacts which exceed preset deployment thresholds and in certain rollovers (window curtain air bags and ETDs).

- Never wear the shoulder belt under your arm, across your neck or off your shoulder.

In a frontal crash, your body would move too far forward. That would increase the chance of head and neck injuries. The seat belt would also apply too much force to the ribs or abdomen, which could severely injure internal organs such as your liver or spleen.

Adjust the seat belt so that the shoulder section is located as close as possible to the middle of the shoulder. It should not touch the neck. Never pass the shoulder portion of the seat belt under your arm. For this purpose, you can adjust the height of the seat belt outlet.

- Position the lap belt as low as possible on your hips and not across the abdomen. If the lap belt is positioned across your abdomen, it could cause serious injuries in a crash.

- Never wear seat belts over rigid or breakable objects in or on your clothing, such as eyeglasses, pens, keys etc., as these might cause injuries.

- Make sure the seat belt is always fitted snugly. Take special care of this when wearing loose clothing.

- Never use a seat belt for more than one person at a time. Do not fasten a seat belt around a person and another person or other objects at the same time.

- Seat belts should not be worn twisted. In a crash, you would not have the full width of the seat belt to distribute impact forces.

The twisted seat belt against your body could cause injuries.

- Pregnant women should also always use a lap-shoulder belt. The lap belt portion should be positioned as low as possible on the hips to avoid any possible pressure on the abdomen.

- Place the seat backrest in a position that is as upright as possible.

- Check your seat belt during travel to make sure it is properly positioned.

- Never place your feet on the instrument panel, dashboard, or on the seat. Always keep both feet on the floor in front of the seat.

- When using a seat belt to secure infant restraints, toddler restraints, or children in booster seats, always follow the child seat manufacturer's instructions.

Do not pass seat belts over sharp edges. They WARNING
Do not pass seat belts over sharp edges. They could tear.

Do not allow the seat belt to get caught in the door or in the seat adjustment mechanism.

This could damage the seat belt.

Never attempt to make modifications to seat belts. This could impair the effectiveness of the seat belts.

Fastening seat belts

According to accident statistics, children are WARNING
According to accident statistics, children are safer when properly restrained on the rear seats than on the front-passenger seat. Thus, we strongly recommend that children be placed in the rear seat whenever possible.

Regardless of seating position, children 12 years old and under must be seated and properly secured in an appropriately sized child restraint system or booster seat recommended for the size and weight of the child. For additional information, see the "Children in the vehicle" section.

A child's risk of serious or fatal injuries is significantly increased if the child restraints are not properly secured in the vehicle and/or the child is not properly secured in the child restraint.

- Adjust the seat and move the backrest to


- Adjust the seat and move the backrest to an almost vertical position.

- Pull the seat belt smoothly through belt sash guide 1.

- Without twisting it, guide the shoulder section of the seat belt across the middle of your shoulder and the lap section across your hips.

- Engage belt tongue 2 in buckle 3.

Seat-belt adjustment: if necessary, the driver's and front-passenger seat belts automatically adjust to the upper body.

- If necessary, adjust the seat belt to the appropriate height.

- If necessary, pull upwards on the shoulder section of the seat belt to tighten the belt across your body.

All seat belts except the driver's seat belt are equipped with a special seat belt retractor to securely fasten child restraint systems in the vehicle. For further information on special seat belt retractors.

For more information about releasing the seat belt with release button 4, see "Releasing seat belts".

Seat belt adjustment

The seat-belt adjustment function adjusts the driver's and front-passenger seat belt to the upper body of the occupants.

The belt strap is tightened slightly when: - you engage the belt tongue in the belt buckle and you then turn the SmartKey to position 2 in the ignition lock.

- the SmartKey is in position 2 in the ignition lock and you then engage the belt tongue in the buckle.

The seat-belt adjustment will apply a retraction force if any slack is detected between the occupant and the seat belt. Do not hold on to the seat belt tightly while it is adjusting. You can switch the seat-belt adjustment on and off in the on-board computer.

The seat-belt adjustment is an integral part of the PRE-SAFE convenience function. More information about PRE-SAFE can be found in the "PRE-SAFE (preventative occupant protection)" section.

Belt height adjustment

You can adjust the seat belt height on the driver's seat and the front-passenger seat.

Adjust the height so that the upper part of the


Adjust the height so that the upper part of the seat belt is routed across the center of your shoulder.

- To raise: slide the belt sash guide upwards.

The belt sash guide engages in various positions.

- To lower: press and hold belt sash guide release 1.

- Slide the belt sash guide downwards.

- Release belt sash guide release 1 and make sure that the belt sash guide has engaged.

Releasing seat belts

- Press release button 4 and guide belt tongue 2 back towards belt sash guide 1.

is fully rolled Make sure that the seat belt
is fully rolled up. Otherwise, the seat belt or belt tongue will be trapped in the door or in the seat mechanism. This could damage the door, the door trim panel and the seat belt.

Damaged seat belts can no longer fulfill their protective function and must be replaced. Consult an authorized Mercedes- Benz Center.

Belt warning for the driver and front passenger

Regardless of whether the driver and front passenger have fastened their seat belts already, the7seat belt warning lamp lights up for engine seconds after every
engine start. It then goes out if the driver and the front passenger have fastened their seat belts.

If the driver's seat belt is not fastened after the engine is started, an additional warning tone will sound. The warning tone goes out after approximately six seconds or once the driver's seat belt is fastened.

If the driver or front passenger have not fastened their seat belt after seconds and
seconds and the doors are closed, the7seat belt warning lamp lights up.

- until the driver or the front passenger have fastened their seat belts - if a vehicle speed of 15 mph(25 km/h) is exceeded once, a warning tone with increasing intensity sounds additionally for a maximum of 60 seconds or until the driver or front passenger have fastened their seat belts.

If the driver or front passenger undo their seat belts during the journey, the belt seat
belt warning lamp lights up and the warning tone sounds again.

The warning tone ceases even if the driver or front passenger have still not fastened their seat belt after 60 seconds. The seat belt
seat belt warning lamp stops flashing but continues to be lit.

Once the vehicle is stationary, the warning tone is reactivated and the belt seat
belt warning lamp starts to flash again if the vehicle speed exceeds 15 mph(25 km/h) once.

The goes seat belt warning lamp only
goes out if:
- both the driver and the front passenger have fastened their seat belts.

or
- the vehicle is stationary and a door is open.

seat For more information on the
belt warning lamp, see "Warning and seat
belt warning lamp, see "Warning and indicator lamps in the instrument cluster, seat belt".

Emergency Tensioning Devices, belt force limiters

The front seat belts and the outer seat belts in the rear are equipped with ETDs and seat belt force limiters.

The ETDs on the driver's and front-passenger seat consist of pyrotechnic belt buckle tensioners and belt anchor fitting tensioners that are triggered together. The belt buckle tensioner is mounted on the B-pillar and the belt anchor fitting is mounted on the side of the seat. Always have both tensioners replaced after they have been triggered.

The ETDs tighten the seat belts in an accident, pulling them close against the body.

The ETDs do not correct incorrect seat positions or incorrectly fastened seat belts.

The ETDs do not pull vehicle occupants back towards the backrest.

Seat belt force limiters, when triggered, help to reduce the peak force exerted by the seat belt on the vehicle occupant.

The seat belt force limiters for the front seats are synchronized with the front air bags.

These take on a part of the deceleration force.

Thus, the force exerted on the occupant is distributed over a greater area.

The ETDs can only be activated when:

- the ignition is switched on.

- the restraint systems are operational; see "SRS warning lamp".

- the belt tongue is engaged in the buckle on each of the lap-shoulder belts in the front.

- the front-passenger seat is occupied and the belt tongue is engaged in the buckle on the front-passenger side.

The ETDs on the outside seats in the rear compartment are triggered independently of the lock status of the seat belts.

The ETDs are triggered depending on the type and severity of an accident: - if, in the event of a head-on or rear-end collision, the vehicle decelerates or accelerates rapidly in a longitudinal direction during the initial stages of the impact
- if, in the event of a side impact, on the side opposite the impact the vehicle decelerates or accelerates rapidly in a lateral direction
- if, in certain situations where the vehicle overturns, the system determines that it can provide additional protection

If the air bags are deployed, you will hear a bang, and a small amount of powder may also be released. Only in rare cases will the bang affect your hearing. The powder that is released generally does not constitute a health hazard. The lights up. SRS warning lamp
lights up.

Pyrotechnic Emergency Tensioning Devices WARNING
Pyrotechnic Emergency Tensioning Devices that have been deployed must be renewed.

For your safety, when disposing of Emergency Tensioning Devices, always observe the safety instructions. These are available from any authorized Mercedes-Benz Center.

The PRE-SAFE system has electrically operated reversible pre-tensioners that do not require replacement after activation.

is not If the front-passenger seat
is not occupied, do not engage the seat belt tongue in the buckle on the frontpassenger seat. Otherwise, the Emergency Tensioning Device could be triggered in the event of an accident.

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