2012 MERCEDES-BENZ R-Class ECU

Display messagesPossible causes/consequences and M SolutionsFront Passenger
Airbag Enabled
See Operator's
ManualThe front-passenger air bag is enabled during the journey, even
though:
R a child, a small adult or an object weighing less than the
system's weight threshold is located on the front-passenger
seat.
R the front-passenger seat is unoccupied.
The system may detect objects or forces applying additional
weight on the seat.XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.XEngage the parking brake.XSwitch off the ignition.XOpen the front-passenger door.XRemove the child and the child restraint system from the front-
passenger seat.XIf necessary, secure the child in a child restraint system on a
suitable rear seat.XMake sure that no objects are exerting force on the seat, e.g.:
R trapped books, bags, etc. lying on, behind or beside the seat
R head restraints pressing against the headliner
The system may otherwise detect these forces and interpret the
seat occupant's weight as greater than it actually is.XKeep the seat unoccupied, close the front-passenger door and
switch on the ignition.
Observe the 42 (Y page 44) indicator lamp and the
multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the 42 indicator lamp must light up and remain lit.
When the indicator lamp is on, OCS (Y page 44) has deactivated
the front-passenger air bag.
R the Front Passenger Airbag Enabled See Operator's
Manual or Front Passenger Airbag Disabled See
Operator's Manual display messages must not appear in the
multifunction display. Wait for a period of at least 60 seconds
until the necessary system checks have been completed and to
make sure that the display messages do not appear in the
multifunction display.
If these conditions are met, the front-passenger seat can be
occupied again. Whether the 42 indicator lamp
remains lit or goes out depends on how OCS classifies the
occupant.
If the conditions are not met, the system is not operating correctly.
Display messages219On-board computer and displaysZ

Warning and indicator lamps in the instrument cluster
Seat belts
ProblemPossible causes/consequences and M Solutions7
After starting the
engine, the red seat
belt warning lamp lights
up for six seconds.The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.XFasten your seat belt ( Y page 51).7
After starting the
engine, the red seat
belt warning lamp lights
up. In addition, a
warning tone sounds
for up to six seconds.GRisk of injury
The driver's seat belt is not fastened.
XFasten your seat belt ( Y page 51).
The warning tone ceases.7
The red seat belt
warning lamp lights up
after the engine starts,
as soon as the driver's
or the front-passenger
door is closed.GRisk of injury
The driver or front passenger has not fastened their seat belt.
XFasten your seat belt ( Y page 51).
The warning lamp goes out.GRisk of injury
There are objects on the front-passenger seat.
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out.238Warning and indicator lamps in the instrument clusterOn-board computer and displays

ProblemPossible causes/consequences and M Solutions7
The red seat belt
warning lamp flashes
and an intermittent
audible warning
sounds.GRisk of injury
The driver or front passenger has not fastened their seat belt. In
addition, you are driving faster than 15 mph (25 km/h) or you have
briefly driven faster than 15 mph (25 km/h).
XFasten your seat belt ( Y page 51).
The warning lamp goes out and the intermittent warning tone
ceases.GRisk of injury
There are objects on the front-passenger seat. In addition, you are
driving faster than 15 mph (25 km/h) or you have briefly driven
faster than 15 mph (25 km/h).
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out and the intermittent warning tone
ceases.
Safety systems
ProblemPossible causes/consequences and M Solutions$ (USA only)
J (Canada only)
The red brake system
warning lamp comes on
while the engine is
running. A warning tone
also sounds.GRisk of accident
There is not enough brake fluid in the brake fluid reservoir.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.XEngage the parking brake.XConsult a qualified specialist workshop immediately.XObserve the additional display messages in the multifunction
display.
Do not add brake fluid. This will not correct the malfunction.
GWARNING
Driving with the brake warning lamp illuminated can result in an accident. Have your brake system
checked immediately if the brake warning lamp stays on. Do not add brake fluid before checking
the brake system.
Overfilling the brake fluid reservoir can result in spilling brake fluid on hot engine parts and the
brake fluid catching fire. You can be seriously burned.
Warning and indicator lamps in the instrument cluster239On-board computer and displaysZ

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Loading guidelines
GWARNING
Always fasten items being carried as securely
as possible. Use cargo tie-down rings and
fastening materials appropriate for the weight
and size of the load.
In an accident, during hard braking or sudden
maneuvers, loose items will be thrown around
inside the vehicle. This can cause injury to
vehicle occupants unless the items are
securely fastened in the vehicle.
To help avoid personal injury during a collision
or sudden maneuver, exercise care when
transporting cargo. Do not pile luggage or
cargo higher than the seat backrests.
The cargo compartment is the preferred place
to carry objects. Always use cargo tie-down
rings, and if so equipped, always use the cargo
net when transporting cargo.
Never drive a vehicle with the tailgate open.
Deadly carbon monoxide (CO) gases may
enter vehicle interior resulting in
unconsciousness and death.
The gross vehicle weight (GVW) is the vehicle
weight including fuel, vehicle tool kit, spare
wheel, installed accessories, vehicle
occupants and luggage/cargo.
The gross load limit and the gross vehicle
weight rating (GVWR) for your vehicle must
never be exceeded. The gross load limit and
the GVWR are specified on the vehicle
identification plate on the B-pillar of the
driver's door ( Y page 333).
The load must also be distributed so that the
weight on each axle never exceeds the gross
axle weight rating (GAWR) for the front and
rear axles. The specifications for GVWR and
GAWR are on the vehicle identification plate
on the B-pillar of the driver's door
( Y page 333).
Further information can be found in the
"Loading the vehicle" section ( Y page 333).
The handling characteristics of a laden
vehicle are dependent on the distribution of
the load within the vehicle. For this reason,
you should observe the following notes when
transporting a load:
R position heavy loads as far forwards as
possible and as low down in the cargo
compartment as possible.
R the load must not protrude above the upper
edge of the seat backrests.
R always place the load against the rear or
front seat backrests. Make sure that the
seat backrests are securely locked into
place.
R hook in the cargo net when loading.
R always place the load behind unoccupied
seats if possible.
R secure the load with sufficiently strong and
wear-resistant tie down. pad sharp edges
for protection.
Stowage areas
Stowage compartments
Important safety notes
GWARNING
To help avoid personal injury during a collision
or sudden maneuver, exercise care when
storing objects in the vehicle. Put luggage or
cargo in the cargo compartment if possible.
248Stowage areasStowing and features

Do not pile luggage or cargo higher than the
seat backrests.
If so equipped, always use the cargo net when
transporting cargo. The cargo net cannot
secure hard or heavy objects.
Parcel nets cannot secure hard or heavy
objects.
Keep compartment lids closed. This will help
to prevent stored objects from being thrown
about and injuring vehicle occupants during
R braking
R vehicle maneuvers
R an accident
Stowage compartments in the front
Glove box
i Depending on the vehicle's equipment,
you will find an AUX IN jack or a Media
Interface installed in the glove box. A Media
Interface is a universal interface for mobile
audio equipment, e.g. for an iPod ®
or USB
device (see the separate COMAND
operating instructions).
XTo open: pull handle : and open glove box
flap ;.XTo close: fold glove box flap ; upwards
until it engages.
The glove box can only be locked and
unlocked using the mechanical key.
1Glove box unlocked2Glove box locked
Stowage compartments in the center
console
Front stowage compartment
Rear stowage compartment
XBriefly press trim ; in the direction of the
arrow.
Cover : swings upwards.
i
In vehicles with the smoker's package, an
ashtray is installed instead of the rear
stowage compartment ( Y page 265).
Stowage areas249Stowing and featuresZ

XPull release handle A.
The front part of center console :
detaches from supporting base ?.XLift center console : upwards in the
direction of arrow B and hold center
console : in this position.XAt the same time, reach into recess ;.XLift center console : by recess ;
upwards in the direction of the arrow to
release center console : from anchoring
points =.XRemove center console : from the
vehicle.
i Supporting base ? cannot be removed.
Installing the center console
GWARNING
The rear center console must be properly
attached to the rear center console base
when the vehicle is in motion. The rear center
console could otherwise come loose. It could
be thrown around in the vehicle interior,
causing injury to the vehicle occupants
during:
R braking
R vehicle maneuvers
R an accident
You can install the center console in two
different positions. In the foremost position
(position 1) you can extend the cargo
compartment fully ( Y page 253) without
removing the center console.
i The stowage compartment and cup
holder will only be illuminated if the center
console is installed in the rear position
(position 0).XPosition center console B above
supporting base =.XMount the retainers of center console B
using anchoring points ? (position 1) or
A (position 0) of basic carrier =.XGuide the front part of center console B
downwards in the direction of the arrow to
supporting base =.
Center console B must rest on supporting
base =.XPush the front part of center console B
downwards until you hear center console
B engage in securing rings : (position 1)
or ; (position 0).252Stowage areasStowing and features

Cargo compartment enlargement
Important safety notesGWARNING
When expanding the cargo volume, always
fully fold the corresponding seats and, if so
equipped, always use the cargo net when
transporting cargo.
Unless you are transporting cargo, the seat
backrests must remain properly locked in the
upright position.
In an accident, during hard braking or sudden
maneuvers, loose items will be thrown around
inside the vehicle. This can cause injury to
vehicle occupants unless the items are
securely fastened in the vehicle.
Always use the cargo tie-down rings.
GWARNING
Never drive a vehicle with the tailgate open.
Deadly carbon monoxide (CO) gases may
enter vehicle interior resulting in
unconsciousness and death.
To enlarge the cargo compartment, the rear
bench seats of the second and third rows of
seats can be folded forwards separately. You
can enlarge the cargo compartment partially
( Y page 253) or fully ( Y page 253).
Partially enlarging the cargo
compartment (folding the seats in the
3rd row forward)
XMove the head restraint of the
corresponding seat down fully
( Y page 100).XClamp the seat belt behind retainer ;.XPull release handle : of backrest =
upwards in the direction of the arrow.
Backrest = is released.XFold backrest = slowly forwards.
Seat cushion ? is released and moves
automatically to a vertical position.XFold backrest = forwards into a horizontal
position.
i Loop A can be used to pull the backrests
of the 3rd row of seats upright when the
seats are moved into the original position
( Y page 256).
Enlarging the cargo compartment
completely (by folding the 2nd and 3rd
row of seats down)
GWARNING
Folded second-row seats are intended to
serve as a cargo volume expansion in
conjunction with folded third-row seats only.
Do not fold the second-row seats and allow
Stowage areas253Stowing and featuresZ

third-row seat occupants to use folded
second-row seats as a footrest while driving.
Third-row seat occupants must, like all vehicle
occupants, keep both feet on the floor in front
of their seat. Otherwise, occupants could
slide under their seat belt in a collision. If
occupants slide under the seat belt, it would
apply force at the abdomen or neck. That
could cause serious or even fatal injuries. Do
not fold the second-row seats and allow third-
row seat occupants to use folded second-row
seats as a table while driving. Objects placed
on folded second-row seats may come loose
during braking, vehicle maneuvers, or an
accident and be thrown around the vehicle
interior. Objects thrown around the vehicle
interior may cause an accident and/or
serious personal injury.
! Make absolutely sure that you adhere to
the specified folding order when fully
enlarging the cargo compartment:
R fold down the center seat in the 2nd row
of seats (7-seat vehicles)
R fold down the outer seats in the 2nd row
of seats
R fold down the seats in the 3rd row of
seats
You could otherwise damage the seats.
Folding down the center seat in the 2nd
row of seats
! Close the cup holder in the 2nd row of
seats before folding down the 2nd row of
seats. You could otherwise damage the
seats or cup holder.XLower the head restraint on the center seat
in the 2nd row of seats fully ( Y page 100).XPull release loop : in the direction of the
arrow.XFold backrest ; forwards completely until
it is resting on seat cushion = (armrest
position).
Armrest position
XPull release loop ? in the direction of the
arrow and hold it securely.
The seat is released and folds up.XPress seat A further down until the front
of the seat engages in the trunk floor
position.
Trunk floor position
254Stowage areasStowing and features