2012 MERCEDES-BENZ GL SUV ignition

Cockpit
Function Page
:
Steering wheel gearshift
paddles
171
;
Combination switch 121
=
Instrumen
tcluster 30
?
Horn
A
DIRECT SELECT lever 167
B
PARKTRONI
Cwarning dis-
play 216
C
Overhead con
trol panel 37
D
Climat
econtrol systems 136
E
Ignition lock 159
Star
t/Stop button 159 Func
tion Page
F
Adjusts th
esteering wheel
manually 110
G
Adjusts th
esteering wheel
electrically 110
Steering wheel heating 111
H
Cruise control lever 193
I
Open
sthe bonnet 360
J
Diagnostics connection 25
K
Electric parking brake 182
L
Ligh
tswitch 119
M
Night View Assist Plus 23528
CockpitAt
ag lance

SRS (Supplementa
lRestraint System)
Introduction SRS consist
sof:
R theS RS warning lamp6
R airbags
R the airbag control unit with crash sensors
R belt tensio ners forthe front seat belts and
the outer seat belts in the rear
R belt force limiters
SRS reduce sthe risk of occupants coming
int oc ontact with the vehicle' sinterior in the
event of an accident. It can also reduce the
forces to which occupant sare subjecte ddur-
ing an accident.
SRS warning lamp G
WARNING
If SRS is malfunctioning, individual systems
may be triggered unintentionally or might not
be triggered in the event of an accident with
ah igh rate of vehicle deceleration.
Am alfunction has occurred if:
R the 6 SRS warning lamp does not light
up when the ignition is switched on.
R the engine is running and the 6SRS
warning lamp does not go out after afew
seconds.
R the engine is running and the 6SRS
warning lamp lights up again.
In this case, have SRS checked immediately
at aq ualified specialist workshop.
SRS functions are checked regularly when
you switch on the ignitio nand whe nthe
engin eisrunning. Therefore, malfunctions
can be detected in good time.
The 6 SRS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out no later than afew seconds
after the engine is started. Triggering of belt tensioners, belt force
limiters and airbags During the first stage of
acollision ,the airbag
con trol unit evaluates important physical
data relatin gtovehicle deceleration or accel-
eration, such as:
R duration
R direction
R magnitude
Based on the evaluation of this data, the air-
bag control unit pre-emptively triggers the
belt tensioners in the first stage.
If there is an even higher rat eofvehicle decel-
eration or acceleration in alongitudinal direc-
tion ,the front airbags ar ealso deployed.
Your vehicle has adaptive, two-stage front air-
bags. The airbag control unit evaluates vehi-
cle deceleration or acceleration in the event
of ac ollision .Inthe first deploymen tstage,
the front airbag is filled with enoug hpropel-
lan tgas to reduce the risk of injuries. The
front airbag is fully deploye difasecond
deployment threshold is reached within afew
milliseconds.
The belt tensioner and airbag triggering
thresholds are variable and are adapted to the
rat eofd eceleration or acceleration of the
vehicle. This process is pre-emptive in nature.
The triggerin gprocess mus ttake place in
good time at the start of the collision.
The rate of vehicle deceleration or accelera-
tion and the direction of the force are essen-
tially determined by:
R the distribution of forces during the colli-
sion
R the collisio nangle
R the deformation characteris tics of the vehi-
cle
R the characteris tics of the object with which
the vehicle has collided
Factors which can only be seen and measured
after acollision has occurred do not play a
decisive role in the deployment of an airbag, Occupant safety
41Safety Z

Sea
tbelt adjustment The seat-belt adjustment func
tion adjusts the
driver's and front-passenger seat belt to the
upper body of the occupants.
The belt strap is tighte neds lightly when:
R you engage the belt tongue in the belt
buckle and you then turn the key to position
2in the ignition lock.
R the key is in position 2in the ignition lock
and you then engage the belt tongue in the
buckle.
The seat-belt adjustment will apply acertain
tightening 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
adjustmen tonand off in the on-board com-
puter (Y page285).
Th es eat-belt adjustmen tisani ntegral part of
the PRE-SAFE ®
convenience function. More
information abou tPRE-SAFE ®
can be found
under "PRE-SAFE ®
(preventative occupant
protection)" (Y page 45).
Belt height adjustment You can adjust the belt height for the front
seats
.Adjust the belt to aheight that allows
the upper part of the seat belt to be routed
across the centre of your shoulder.
X To raise: slide the belt sash guide upwards.
The belt sash guide engages in various posi-
tions.
X To lower: press and hold belt sash guide
release :. X
Slide the belt sash guide downwards.
X Let go of belt sash guide release :and
mak esure that the belt sash guide has
engaged.
Releasing the seat belts !
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. Dam-
aged seat belts can no longer fulfil their
protective function and must be replaced.
Visit aqualified specialist workshop. :
Belt sash guide
; Belt tongue
= Buckle
? Release button
X Press release button ?and guide belt
tongue ;back towards belt sash
guide :.
Belt warning for the driver and front
passenger The
7 seat belt warning lamp in the instru-
ment cluster is areminder for all occupants
to fasten their seat belts. It may light up con- 48
Occupant safetySafety

The seat belts on the following seats have belt
tensioner
sand bel tforc elimiters:
R driver's and front-passenger seat
R the outer seats in the second row
R the seats in the third row
The belt tensioners tighten the seat belts in
an accident ,pulling them close against the
body.
Belt tensioners do not correc tincorrect seat
positions or incorrectly fastened sea tbelts.
Belt tensioners do not pull vehicle occupants
back towards the backrest.
If the seat belt is also fit tedw ithabelt force
limiter and this is triggered, the force exer ted
by the seat belt on the vehicle occupant is
reduced.
The belt force limiters for the fron tseats are
synchronised with the fron tairbags, which
tak eona part of the deceleration force. This
result sinthe force exerted on the occupant
being distributed over agrea tera rea.
Th eb elt tensioners can only be activa ted
when:
R the ignition is switched on.
R the restraint system sare opera tional; see
"SR Swarnin glamp" (Y page 41).
The belt tensioners on the outside seats in the
second row and on the seats in the thir drow
ar et riggere dindependently of the lock status
of the sea tbelts.
The belt tensioners are triggere ddepending
on the type and severity of an accident:
R if, in the even tofahead-on or rear-end col-
lision, the vehicle decelerates or acceler-
ates rapidly in alongitudinal direction dur-
ing the initial stages of the impact
R if, in the even tofaside impact, on the side
opposit ethe impac tthe vehicle deceler-
ates or accelerates rapidly in alateral direc-
tion
R in certain situations where the vehicle over-
turns and the system determines that it can
provide additional protection If the airbags are deplo
yed,you will hear a
bang, and asmall amount of powder may also
be released. Only in rare cases will th ebang
affect your hearing. The powde rthat is
released generally does not constitute a
healt hhazard. The 6SRS warning lamp
lights up. Children in the vehicle
Child restraint systems
Important safety notes G
WARNING
To reduce the risk of serious or even fatal
injury to the child in the event of asudden
change in direction, braking or an accident:
R children less than 1.50 mtall and under
twelve years of age must always be secured
in special child restraint systems on asuit-
able vehicle seat. This is necessary
because the seat belts are not designed for
children.
R Do not drive with achild secured in arear-
ward-facing child restraint system on the
front-passenger seat. Exception: if the vehi-
cle is equipped with automatic child seat
recognition on the front-passenger seat
and the child is secured in achild restraint
system with transponders for automatic
chil dseat recognition
R if you secur eaforward-facing child
restraint system to the front-passenger
seat, you must mov ethe front-passenger
seat as fa rback as possible.
R children must never travel sitting on the lap
of another occupant. Due to the forces
which occur in the event of asudden
change of direction, heavy braking or an
accident, it would not be possible to
restrain the child. The child could be thrown
against parts of the vehicle interior and be
seriously or even fatally injured. 50
Children in the vehicleSafety

Warning notice on the front-passenger sun visor
Warning symbol for
arearward-facin gchild
rest raint system
Do not use arearward-facin gchild rest raint
system on aseat that is protected by an air-
bag installed in fron tofit.
Automatic chil dseat recognition on the
front-passenger seat G
WARNING
If the 4 PASSENGE RAIRBA GO FF indica-
tor lamp does not light up whe nthe child
restraint system is fitted, the fr ont-passenger
airbag has not been disabled. If the fr ont-
pa ssenger airbag deploys, the chil dcould be
seriou slyor even fatally injured.
Proceed as follows:
R do not use arearward-facin gchild restraint
system on the fr ont-passengers eat.
R fit arearward-facing child restraint system
on asuitable rear seat.
or R
only use aforward-facing child rest raint
system on the front-passenger seat and
move the front-passenger seat to the rear-
most position.
R have the automatic child seat recognition
checked at aqualified specialist workshop.
To ensure that the automatic child seat rec-
ognition on the front-passenger seat func-
tions/communicates correctly, never place
objects, e.g. acushion, under the child
restraint system. The entire base of the child
restraint system must alway srest on the seat
cushion. An incorrec tlyf itted child restraint
system cannot perfor mits intended protec-
tive function in the event of an accident, and
could lead to injuries. G
WARNING
Do not place electronic devices on the front-
passenger seat, e.g.:
R laptops, when switched on
R mobile phones
R cards with transponders, e.g. ski passes or
access cards
Signals from electronic equipment can cause
interference in the automatic child seat rec-
ognition sensor system. Thi scan lead to a
system malfunc tion. This may cause the
4 PASSENGER AIRBA GOFF indicator
lamp to light up without there being achild
seat with transponder sfor automatic child
seat recognition fit ted. The front-passenger
airba gwill not then deploy during an accident.
It is also possible that the 6SRS warning
lamp lights up and/or the 4PASSENGER
AIRB AGOFF indicator lam pdoes not light up
briefly when you tur nthe key in the ignition
lock to position 2.52
Children in th
evehicleSafety

If th
efront-passenger seat of yo urvehicle
does no thave automatic child seat recogni-
tion, this is indicated by aspecial sticker. The
sticker is affixed to the side of the dashboard
on the front-passenger side. The sticker is
visible when you open the front-passenger
door.
Vehicles without automatic child seat recog-
nition on the front-passenger seat: if you turn
the key to position 2inthe ignition lock ,the
PAS SENG ER AIRBAG OFF 4indicator
lamp lights up briefly. It has no function, how-
ever, and doe snot indicate that the front-
passenger seat is equipped with automatic
child seat recognition. The front-passenger seat sensor system for
child restraint system
sdetect swhether a
special Mercedes-Ben zchild seat with a
transpo nder for automatic child seat recog-
nition has been fitted. In this case, 4
PASSENGER AIRBA GOFF indicato rlamp :
lights up. The front-passenger front airbag is
disabled. i
If the front-passenger front airbag is dis-
abled by the automatic child seat recogni-
tion, the following remain enabled on the
front-passenger side:
R the sidebag
R the windowbag
R the belt tensioner
ISOFI Xchilds eat securing system for
the rear seats G
WARNING
Ac hild restraint system secured by the ISOFIX
chil dseat securing system does not provide
sufficien tprotection for children weighing
more than 22 kg. For this reason, do not
secure children weighing more than 22 kg in
ac hild restraint system secured by the ISOFIX
chil dseat securing system. If the child weighs
mor ethan 22 kg, secur ethe chil drestraint
system with the vehicle seat belt as well. In
addition ,when fittin gachild restraint system,
be sur etoobservethe manufacturer' sinstal-
latio ninstructions and the instructions for
correct use of the child restraint system. G
WARNING
The child restraint system cannot perform its
protective function if it is not correctly fitted
to as uitable vehicle seat. The child cannot be
restrained in the event of an accident, heavy
braking or sudde nchanges of direction. The
chil dcould be seriously or even fatally injured.
For this reason, when fittin gachild restraint
system ,besure to observe the manufactur-
er's installatio ninstructions and the instruc-
tions for correct use of the child restraint sys-
tem.
For safety reasons, whe ninstalling child
restraint systems on the outer rear seats, only
use child restraint systems with the ISOFIX
child sea tsecuring system, which are spe-
ciall ytested and approved for Mercedes-Benz
vehicles.
An incorrectly fitted child restraint system
could com eloose and seriously or even fatally Children in the vehicle
53Safety
Z

Problems wit
hautomatic chil dseat recognition Problem Possible causes/consequences and
M Solutions
The
4 PASSENGER
AIRB AGOFF indicator
lam ponthe cen trecon-
sole is lit. As
pecial Mercedes-Benz child seat with atransponde rfor auto-
matic child seat recognition has been fit tedtot he front-passenger
seat. The front-passenger fron tairbag has therefore been disabled
as desired. The
4 PASSENGER
AIRBA GOFF indi cator
lamp on the centr econ-
sole is lit.
or
The 6 warnin glamp
lights up and/or the
4 PASSENGER AIR-
BA GO FF indi cator
lamp doe snot light up
briefly when you switch
the ignition on. G
WARNING
There is no child seat fitted to the fr ont-passengerseat .Automatic
child seat recognition is malfunctioning.
There is arisk of injur y.
X Remove electronic equipment from the front-passenger seat,
e.g.:
R
laptop
R mobil ephone
R card switht ransponders, such as sk ipasses or accessc ards
If the 4 PASSENGER AIRBAG OFF indicator lamp is still lit:
X Vis itaq uali fieds pecialist workshop. Suitable positioning of the child
restraint syste
ms X
Ifyou fit achild restraint system to the
front-passenger seat, position the front-
passenger seat in its rearmos tposition.
X If you install achild rest raint system on the
rear seat on the second row, move the rear
seat backrest sinthe secon drow to an
upright position.
Key to the letters used in the following table:
XS eat which is unsuitable for children in
this weight category.
US uitable for child rest raint systems in the
"Universal" categor ythat ar eapproved
for use in this weigh tcategory.
LS uitable for child rest raint systems as rec-
ommended; see th efollowin gtable of
"Recommended child restraint systems"
(Y page 58). Front-passenger seat Weight cat-
egories Front-
passenger
front air-
bag is not
disabled. Front-
passenger
front air-
bag is disa-
bled.
Categor
y0:
up to 10 kg X U
Cate
gory
0+: up to
13 kg X U
Category I:
9to18kg
L U
Category II:
15 to 25 kg
L L
Category
III: 22 to
36 kg
L L56
Children in the vehicleSafety

Important safety notes
If you fail to adapt your driving style or
become distracted, th edriving sa fetysys-
tems ca nneith er reduce th erisk of accident
no ro verri dethe law sofphysics. Driving
safety system sare mere ly aids desig nedto
assis tdrivi ng.You ar eresponsible for the dis-
tance to the vehicle in fr ont, forvehicle speed
and for braking in good time. Alway sadapt
your drivin gstyle to suit the prevailing road
and weather condition sand maintain asafe
distance from the vehicle in front .Drive care-
fully.
i Thed riving safet ysystems described only
work as effectively as possibl ewhen there
is adequate con tact betwee nthe tyres and
the roa dsurface. Pleas epay special atten-
tion to the notes on tyres, recommended
minimum tyre tread depths ,etc.
(Y page 396).
In wintry driving conditions, always use
winter tyres (M+S tyres) and if necessary,
snow chains .Only in this way will the driv-
ing safety systems described in this section
work as effectively as possible. ABS (Anti-lock Braking System)
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page61). G
WARNING
If ABS is faulty, the wheels could lock when
braking .The steerability and brakin gcharac-
teristics ma ybeseverely impaired. Addition-
ally, further driving safet ysystems are deac-
tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diatel yata qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the infor mation on the ABS warning lamp (Y
page 326) and
display messages which may be shown in the
instrument cluster (Y page 291).
ABS regulate sbrake pressure in such away
that the wheels do not lock when you brake.
This allows you to continue steering the vehi-
cle when braking.
ABS works from aspeed of about 8km/h
upwards, regardless of road-surfac econdi-
tions. AB Sworksons lippery surfaces, even
when you only brake gently.
The yellow !ABS warnin glamp in the
instrument cluster lights up when the ignition
is switched on. It goes out when the engine is
running.
Brakes X
If ABS intervenes: continue to depress the
brake pedal with force until the braking sit-
uation is over.
X To mak eafull brake application:
depress th ebrake peda lwith full force.
If ABS intervenes when braking, you will feel
ap ulsing in the brake pedal.
The pulsating brake pedal can be an indica-
tion of hazardous road conditions, and func-
tions as areminder to take extr acare while
driving.
Off-road ABS An ABS system specifically suited to off-road
terrain is activated automatically once the off-
road program is activated on:
R
Vehicles without the ON&OFFROAD pack-
age (Y page 252)
R Vehicles with the ON&OFFROAD package
(Y page 253)
At speeds below 30 km/h, the front wheels
lock cyclically during braking. The digging-in
effect achieved in the process reduces the
stopping distance when driving off-road. This
limits steering capability. Driving safety systems
61Safety Z