Page 79 of 498
77 Safety and Security
Occupant safety
The 56indicator lamp is located in
the center console.
1Front passenger front air bag off
indicator lamp
The 56indicator lamp1 will be
illuminated, except with the SmartKey
removed or in starter switch position0.
iDeployment of the driver front air bag
does not mean that the front passenger
front air bag also should have de-
ployed.
The Occupant Classification System
(page 73) may have determined:
that the seat was empty or occu-
pied by the weight up to or less than
that of a typical 12-month-old child
seated in a standard child restraint
- both instances where the system
suppresses deployment of the front
passenger front air bag even
though the impact met the criteria
and was of sufficient severity to de-
ploy the driver front air bag.
that the seat was occupied by a
small individual (such as a young
teenager or a small adult) or a child
weighing more than the weight of a
typical 12-month-old child in a stan-
dard child restraint - instances
where the system may suppress
deployment of the front passenger
front air bag even though the
impact met the criteria and was of
sufficient severity to deploy the
driver front air bag.
Page 81 of 498
79 Safety and Security
Occupant safety
More information can be found in the
“Practical hints” section (
page 360).Installation of infant and child restraint
systems
This vehicle is equipped with tether an-
chorages for a top tether strap at each of
the rear seating positions.
1Anchorage ring
2Hook
Open the trunk and release the rear
seat backrest (
page 268).
Fold rear seat backrest slightly for-
ward.
Guide top tether strap between head
restraint and top of seat back.
Head restraint must be installed and
positioned such that the top tether
strap can pass freely between the head
restraint and the top of seat back.
Make sure the tether strap is not twist-
ed.
1Anchorage ring
2Hook
Fold up anchorage ring1.
Securely fasten hook2, which is part
of the tether strap, to anchorage
ring1.
Warning!
G
If the 56 indicator lamp should not
illuminate, the system is not functioning.
You must see an authorized Mercedes-Benz
Center before seating any child on the front
passenger seat.Warning!
G
Never place anything between seat cushion
and child seat (e.g. pillow), since it reduces
the effectiveness of the Occupant Classifi-
cation System. The bottom of the child seat
must make full contact with the passenger
seat cushion. An incorrectly mounted child
seat could cause injuries to the child in case
of an accident, instead of increasing protec-
tion for the child.
Follow the manufacturer’s instructions for
installation of child seats.
Page 82 of 498
80 Safety and SecurityOccupant safety
Swing rear seat backrest to the rear un-
til it engages.
Check the rear seat backrest to be
locked in its upright position
(page 269).Once the top tether anchorage hook is
attached, the child restraint itself can be
secured. Tighten the top tether strap ac-
cording to the child restraint manufactur-
er’s instructions. Child seat anchors – LATCH type
This vehicle is equipped with two LATCH
(L
ower A
nchors and T
ethers for CH
ildren)
type anchors (at each of the rear seats) for
the installation of a LATCH child seat with
matching mounting fittings.
If child seats are not installed, the LATCH
anchors can be folded back between the
seat cushion and the seat backrest.
iFor safety, make sure the hook2 has
attached to the anchorage ring1 be-
yond the safety catch, as illustrated.
Warning!
G
Always lock backrest in its upright position
when rear seat bench is occupied by pas-
sengers, or the extended cargo area is not in
use. Check for secure locking by pushing
and pulling on the backrest.
Page 83 of 498
81 Safety and Security
Occupant safety
To fold anchors out
1Anchors
2Release button
Grip inner side of anchors1 and fold
forward until they audibly lock in place.
Install child seat according to the man-
ufacturer’s instructions.To fold anchors back
Press down button2 on each
anchor1 and return the anchor1 to
its catch.
iThe child seat must be firmly attached
in the right and left side anchors1.
iNon-LATCH type child seats may also
be used and can be installed using the
vehicle’s seat belt system. Install child
seat according to the manufacturer’s
instructions.Warning!
G
Children too big for a toddler restraint must
ride in seats using regular seat belts.
Position shoulder belt across chest and
shoulder, 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 properly without a
booster.
Before installing the child seat, make sure
anchors1 are folded out and locked in
place.
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 anchor1.
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 anchor fittings must be replaced.
Do not leave children unattended in the ve-
hicle, even if the children are secured in a
child restraint system.
Page 123 of 498
121 Controls in detail
Memory function
Memory function
You can store up to three different settings
per SmartKey or SmartKey with
KEYLESS-GO*.
The following settings are stored when
using the buttons on the driver’s door:
Driver’s seat, backrest and head
restraint position
Steering wheel position
Exterior rear view mirror position
These key-dependent memory settings
can be deactivated if desired. For informa-
tion on key-dependent memory settings,
see “Setting key-dependency”
(
page 160).The following settings are not
key-dependent. They are stored when us-
ing the buttons on the passenger door:
Front passenger seat, backrest and
head restraint position
!Prior to operating the vehicle, the
driver should check and adjust the seat
height, seat position fore and aft, and
seat backrest angle if necessary, to
ensure adequate control, reach and
comfort. The head restraint should also
be adjusted for proper height. See also
the section on air bags (
page 61) for
proper seat positioning.
In addition, adjust the steering wheel to
ensure adequate control, reach, opera-
tion and comfort. Both the interior and
exterior rear view mirrors should be
adjusted for adequate rear vision.
Fasten seat belts. Infants and small
children should be seated in a properly
secured restraint system that complies
with U.S. Federal Motor Vehicle Safety
Standards 213 and 225 and Canadian
Motor Vehicle Safety Standards 213
and 210.2.
Warning!
G
Do not activate the memory function while
driving. Activating the memory function
while driving could cause the driver to lose
control of the vehicle.
Page 363 of 498
361 Practical hints
What to do if …?
Problem
Possible cause
Suggested solution
56
The front passenger front air bag
off indicator lamp does not illu-
minate and/or does not remain
illuminated with the weight of a
typical 12-month-old child in a
standard child restraint or less
on the front passenger seat.
The system is malfunctioning.
Make sure that there is nothing be-
tween seat cushion and child seat and
check installation of the child seat.
Make sure that no objects applying
supplemental weight onto the seat
are present.
If the front passenger front air bag off
indicator lamp remains out, have the
system checked as soon as possible
by an authorized Mercedes-Benz Cen-
ter. Do not transport a child on the
front passenger seat until the system
has been repaired.
Also note any messages in the multi-
function display and follow corrective
steps (
page 368).
Warning!
G
If the 56 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 on the front
passenger seat, do not transport a child on
the front passenger seat until the system
has been repaired.
Page 461 of 498
459 Technical terms
REST
(Residual engine heat utilization)
Feature that uses the engine heat
stored in the coolant to heat the vehi-
cle interior for a short time after the en-
gine has been turned off.
Restraint systems
Seat belts, child restraints, lower an-
chors and tethers for children (LATCH).
As independent systems, their protec-
tive functions complement one anoth-
er.RON
(R
esearch O
ctane N
umber)
The Research Octane Number for gaso-
line as determined by a standardized
method. It is an indication of a gaso-
line's ability to resist undesired detona-
tion (knocking). The average of both
the ->MON (Motor Octane Number)
and RON (Research Octane Number) is
posted at the pump, also known as
ANTI-KNOCK INDEX.Shift lock
When the vehicle is parked, this lock
prevents the gear selector lever from
being inadvertently moved out of
positionP without SmartKey turned
and brake pedal depressed.
Speedshift (CLK 500*, CLK 55 AMG)
Steering wheel gearshift control. You
can change the gears yourself with the
steering wheel gearshift buttons.
SRS
(S
upplemental R
estraint S
ystem)
Air bags, air bag control unit (with
crash sensor), emergency tensioning
device. Though independent systems,
they are closely interfaced to provide
effective occupant protection.
Page 467 of 498
465 Index
Central locking
Automatic 110
From inside 110
Switch 110
Switching on/off
(control system) 158
Unlocking from inside 110
Central locking switch 110
Changing
CDs 225
Key setting 158
Charcoal filter 202
Activating 203
Deactivating 203
Charging
Vehicle battery 422
CHECK ENGINE
malfunction indicator lamp 356
Checking
Coolant level 313
Oil level 307, 310
Tire inflate pressure 307
Vehicle lighting 307Child safety 70
Air bags 62
Front passenger front
air bag off indicator lamp 77
Infant and child
restraint systems 67, 70
LATCH child seat anchors 80
OCS 73
Child safety switch see
Blocking of rear window operation
Child seat anchors see
LATCH child seat anchors
Cigarette lighter 277Cleaning 347
Cup holder 351
Gear selector lever 351
Hard plastic trim items 351
Headlamps 178
Headliner 352
Instrument cluster 351
Leather upholstery 352
Light alloy wheels 351
Nubuck leather upholstery
(CLK 55 AMG) 352
Parktronic system* sensor 350
Plastic and rubber parts 352
Seat belts 352
Steering wheel 351
Upholstery 352
Windows 351
Windshield 53
Wiper blades 350
Wood trims 352
Cleaning and care of vehicle 347
Cleaning tires 318