Page 69 of 491

68 Safety and SecurityOccupant safety
The air bags will not deploy in impacts 
which do not exceed the system’s deploy-
ment thresholds. You will then be protect-
ed by the fastened seat belts.
The passenger front air bag will only be 
deployed if:
the system, based on OCS weight sen-
sor readings, senses that the front pas-
senger seat is occupied
the 75indicator lamp in the 
center console is not lit (
page 80)
the impact exceeds a preset deploy-
ment thresholdSide impact air bags, window curtain 
air bags
1Side impact air bags
2Window curtain air bag
The side impact air bags and window 
curtain air bags are deployed:
on the impacted side of the vehicle
in impacts exceeding a preset deploy-
ment threshold
independently of the front air bags
iThe front air bags in this vehicle have 
been designed to inflate in two stages. 
This allows the air bag to have different 
rates of inflation that are based on the 
rate of relevant vehicle deceleration as 
assessed by the air bag control unit.
On the front passenger side, the front 
air bag deployment is additionally influ-
enced by the passenger’s weight cate-
gory as identified by the Occupant 
Classification System (OCS) 
(page 76).
The lighter the front passenger side oc-
cupant, the higher the vehicle deceler-
ation rate required for the second 
stage inflation of the air bag.  
     
        
        Page 70 of 491

69 Safety and Security
Occupant safety
In addition, the window curtain air bags 2 
are deployed:
in certain vehicle rollovers
The side impact air bags and window cur-
tain air bags are not deployed in impacts 
which do not exceed the system’s deploy-
ment threshold.
Seat belts
When the engine is started the seat belt 
telltale< illuminates for approximately 
six seconds. A warning chime sounds to 
remind you to fasten your seat belt.
If after these six seconds, the driver’s or 
the front passenger’s seat belt (with the 
front passenger seat occupied) are not fas-
tened with all doors closed, 
and the vehicle speed does not exceed 
15 mph (25 km/h), the seat belt tell-
tale < remains illuminated for as 
long as either the driver’s or front pas-
senger’s seat belt are not fastened. 
and the vehicle speed exceeds 15 mph 
(25 km/h), the seat belt telltale < 
starts flashing and a warning chime 
sounds with increasing intensity until 
both the driver’s and front passenger’s 
seat belt are fastened, or for a maxi-
mum of 60 seconds from the time the 
vehicle speed exceeded 15 mph 
(25 km/h) if either the driver’s or front 
passenger’s seat belt remains unfas-
tened. 
If the driver’s or front passenger’s seat 
belt remains unfastened after 
60 seconds, the seat belt telltale< 
stops flashing and the warning chime 
stops sounding. The seat belt 
telltale< then continues to be illu-
minated for as long as either the driv-
er’s or front passenger’s seat belt are 
not fastened.The seat belt telltale < will only go out 
if both the driver’s and front passenger’s 
seat belt (with the front passenger seat oc-
cupied) are fastened, or the vehicle is 
standing still and a front door is opened. 
For more information, see “Practical hints” 
(
page 357).
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 fas-
tened whenever the vehicle is in motion.
For more information, see “Fastening the 
seat belts” (
page 44). 
     
        
        Page 72 of 491

71 Safety and Security
Occupant safety
Warning!
G
Damaged seat belts or belts that were highly 
stressed in an accident must be replaced 
and their anchoring points must also be 
checked.
Only use seat belts which have been ap-
proved by Mercedes-Benz.
Do not make any modifications to the seat 
belts. This can lead to unintended activation 
or to failure.
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.
Warning!
G
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 sec-
tion, as that could result in serious inju-
ries in case 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, includ-
ing rollovers. The integrated restraint 
system includes SRS (driver air bag, pas-
senger front air bag, side impact air 
bags, head protection window curtain 
air bags for side windows), ETD (seat 
belt emergency tensioning device), and 
front seat knee bolsters. 
The system is designed to enhance the 
protection offered to properly belted oc-
cupants in certain frontal (front air bags 
and ETD) and side (side impact and win-
dow curtain air bags and ETD) impacts 
which exceed preset deployment 
thresholds and in certain rollovers (win-
dow curtain air bags and ETD).
Never wear the shoulder belt under your 
arm, against your neck or off your shoul-
der. In a frontal crash, your body would 
move too far forward. That would in-
crease the chance of head and neck in-
juries. The belt would also apply too 
much force to the ribs or abdomen, 
which could severely injure internal or-
gans such as your liver or spleen.
 
     
        
        Page 77 of 491

76 Safety and SecurityOccupant safety
Occupant Classification System
The Occupant Classification System (OCS) 
automatically turns the front passenger 
front air bag on or off based on the classi-
fied occupant weight category determined 
by weight sensor readings from the front 
passenger seat. 
Occupants must sit properly belted in a 
nearly upright position with their back 
against the seat backrest and feet on the 
floor to be correctly classified. If the occu-
pant's weight is transferred to another 
object in the vehicle (e.g. by leaning on 
armrests), the OCS may not be able to 
properly approximate the occupant’s 
weight category. 
Warning!
G
Infants and small children should never 
share a seat belt with another occupant. 
During an accident, they could be crushed 
between the occupant and seat belt.
A child’s risk of serious or fatal injuries is 
significantly increased if the child restraints 
are not properly secured in the vehicle and 
the child is not properly secured in the child 
restraint.
Children too big for a toddler restraint must 
ride in seats using regular seat belts. Posi-
tion shoulder belt across chest and shoul-
der, not face or neck. A booster seat may be 
necessary to achieve proper belt positioning 
for children from 41 lbs until they reach a 
height where a lap/shoulder belt fits proper-
ly without a booster.
When the child restraint is not in use, re-
move it from the vehicle or secure it with the 
seat belt to prevent the child restraint from 
becoming a projectile in the event of an ac-
cident.
Do not leave children unattended in the ve-
hicle, even if the children are secured in a 
child restraint system. Unsupervised chil-
dren in a child restraint system may use ve-
hicle equipment and may cause an accident 
and/or serious personal injury.
iThe system does not deactivate the 
front passenger side impact air bag, 
the window curtain air bag and the 
emergency tensioning device. 
     
        
        Page 85 of 491

84 Safety and SecurityOccupant safety
Install child seat according to the 
manufacturer’s instructions.
Blocking of rear door window operation
1Override switch
2Indicator lamp
Press override switch1.
Indicator lamp2 comes on. The rear 
door windows can no longer be operat-
ed using the switches located in the 
rear doors.
!Make sure the seat belt for the center 
seat can operate freely with a child 
seat installed.iNon-LATCH type child seats may also 
be used and can be installed using the 
vehicle’s seat belt system (
page 73). 
Install child seat according to the man-
ufacturer’s instructions.
Warning!
G
Children too big for a toddler restraint must 
ride in seats using regular seat belts. Posi-
tion shoulder belt across chest and shoul-
der, not face or neck. A booster seat may be 
necessary to achieve proper belt positioning 
for children from 41 lbs until they reach a 
height where a lap/shoulder belt fits proper-
ly without a booster.
Install child seat according to manufactur-
er’s instructions.
T h e  c h i l d  s e a t  m u s t  b e  f i r m l y  a t t a c h e d  i n  t h e  
right and left side anchors2.
An incorrectly mounted child seat may come 
loose during an accident which could result 
in serious injury or death to the child.
Damaged or impact damaged child seats or 
child seat mounting fittings must be re-
placed.
Do not leave children unattended in the 
vehicle, even if the children are secured in a 
child restraint system.
!Operation of the rear door windows 
with the switches located on the door 
control panel of the driver’s door is still 
possible. 
     
        
        Page 86 of 491
85 Safety and Security
Occupant safety
For more information on power windows, 
see the “Controls in detail” section 
(page 221).Warning!
G
Activate the override switch when children 
are riding in the back seats of the vehicle. 
The children may otherwise injure them-
selves, e.g. by becoming trapped in the win-
dow opening.
When leaving the vehicle, always remove the 
SmartKey or the SmartKey with 
KEYLESS-GO* from the starter switch, take 
it with you, and lock the vehicle. Do not 
leave children unattended in the vehicle, or 
with access to an unlocked vehicle. Unsu-
pervised use of vehicle equipment can 
cause an accident and/or serious personal 
injury. 
     
        
        Page 102 of 491
101 Controls in detail
Locking and unlocking
Seats
Memory function
Lighting
Instrument cluster
Control system
Automatic transmission
Good visibility
Dual-zone automatic climate control
4-zone automatic climate control*
Power windows
Power tilt / sliding sunroof*
Driving systems
Loading
Useful features 
     
        
        Page 104 of 491

103 Controls in detail
Locking and unlocking
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, take it 
with you, and lock the vehicle. Do not leave 
children unattended in the vehicle, or with 
access to an unlocked vehicle. It is possible 
for children to open a looked door from the 
inside, which could result in an accident 
and/or serious injury.!To prevent possible malfunction, avoid 
exposing the SmartKey to high levels of 
electromagnetic radiation.
iUSA only:
This device complies with Part 15 of 
the FCC Rules. Operation is subject to 
the following two conditions:
(1) This device may not cause harmful 
interference, and 
(2) this device must accept any inter-
ference received, including interfer-
ence that may cause undesired 
operation.
Any unauthorized modification to this 
device could void the user’s authority 
to operate the equipment.
iCanada only:
This device complies with RSS-210 of 
Industry Canada. Operation is subject 
to the following two conditions:
(1) This device may not cause interfer-
ence, and
(2) this device must accept any inter-
ference received, including interfer-
ence that may cause undesired 
operation of the device.
Any unauthorized modification to this 
device could void the user’s authority 
to operate the equipment.iThe SBC brake system is activated 
(page 92).
iYou can also open and close the power 
windows and tilt/sliding sunroof* us-
ing the SmartKey (
page 223).