The lowest value listed must be selected
when determining how the vehicle and
trailer are loaded.
R The tongue weight at the hitch ball must be
added to the rear axle weight to prevent
exceeding the rear Gross Axle Weight
Rating (GAWR). The GAWR is indicated on
the certification label located on the
driver’s door B-pillar ( Y page 227).
i Mercedes-Benz recommends loading the
trailer in such a manner that it has a tongue
weight between 8 % and 15 % of the GTW.
i The weight of other accessories,
passengers and cargo will reduce the
maximum trailer weight and tongue weight
your vehicle can tow.
Checking weights of vehicle and trailer
R To assure that the towing vehicle and trailer
are in compliance with the maximum
permissible weight limits, have the loaded
rig (towing vehicle including driver,
passengers and cargo, trailer fully loaded)
weighed on a commercial scale.
R Check the vehicle’s front and rear gross
axle weight, the Gross Trailer Weight (GTW)
and tongue weight.
The values as measured must not exceed
the weight limits listed under “Vehicle and
trailer weights and ratings” ( Y page 254).
Coupling a trailer GWarning!
Vehicles with air suspension program: While
you are coupling or decoupling a trailer, make
sure nobody locks or unlocks the vehicle and/
or opens or closes doors or the tailgate.
The vehicle’s level could change and you
could endanger yourself and/or others as a
result.
Make sure that you do not operate the ADS
switch or the vehicle level control system
when coupling/decoupling the trailer.
Observe maximum permitted trailer
dimensions (width and length).
Most states and all Canadian provinces
require
R safety chains between the towing vehicle
and the trailer
The chains should be criss-crossed under
the trailer tongue. They must be attached
to the hitch receiver, and not to the
vehicle’s bumper or axle.
Make sure to leave enough slack in the
chains to permit turning corners.
R a separate brake system at various trailer
weights
R a break-away switch on trailers with a
separate brake system.
Check with your local state laws for specific
requirements.
The switch activates the trailer brakes in
the possible event that the trailer might
separate from the tow vehicle.
! Do not connect a trailer brake system (if
trailer is so equipped) directly to the
vehicle’s hydraulic brake system, as your
vehicle is equipped with antilock brakes. If
you do, neither the vehicle’s brakes nor the
trailer’s brakes will function properly.
i The provided vehicle electrical wiring
harness for trailer towing has a brake signal
wire for hook-up to a brake controller.XMake sure the automatic transmission is in
park position P (Y page 110).XEngage the parking brake for the vehicle
( Y page 107).XStart the engine ( Y page 103).XVehicles with vehicle level control:
Select the highway level ( Y page 156).XVehicles with Adaptive Damping System
(ADS):
Set the ADS to AUTO or COMF
( Y page 156).XTurn off the engine ( Y page 108).Driving instructions255Operation164_AKB; 7; 31, en-USd2ureepe,Version: 2.11.8.12009-09-11T12:07:36+02:00 - Seite 255Z
Avoid riding the brakes, thus overheating
the vehicle and trailer brakes (if so
equipped).
R If the engine coolant rises to an extremely
high temperature when the air conditioning
is on, turn off the air conditioning system.
Engine coolant heat can be additionally
vented by opening the windows, switching
the climate control fan speed to high and
setting the temperature control to the
maximum.
R During a passing maneuver extreme care
must be exercised since your vehicle with
a trailer will require additional passing
distance ahead than when driving without
a trailer.
Because your vehicle and trailer is longer
than your vehicle alone, you will also need
to go much farther ahead of the passed
vehicle before you can return to your lane.
Decoupling a trailer GWarning!
Vehicles with air suspension program: While
you are coupling or decoupling a trailer, make
sure nobody locks or unlocks the vehicle and/
or opens or closes doors or the tailgate.
The vehicle’s level could change and you
could endanger yourself and/or others as a
result.
Make sure that you do not operate the ADS
switch or the vehicle level control system
when coupling/decoupling the trailer.
XMake sure the automatic transmission is in
park position P (Y page 110).XEngage the parking brake for the vehicle
( Y page 107).XStart the engine ( Y page 103).XClose all doors and the tailgate.XEngage the parking brake for the trailer.GWarning!
Vehicles with air suspension program: As
soon as you disconnect the electrical
connection between the trailer and the
vehicle, the vehicle will lower. To help avoid
personal injury, make sure no one is near the
wheel housing or underneath the vehicle
before the electrical connection is
disconnected.
When you decouple the trailer, the vehicle is
temporarily raised because the springs are
relieved of load. Be especially careful during
this process, as you could otherwise injure
yourself and/or others. Make sure that any
persons remaining in the vehicle do not press
the switches for vehicle level control or the
ADS.
XDisconnect all electrical plug connectors.XDecouple the trailer.XMake sure that the trailer coupling is free
of load.XTurn off the engine ( Y page 108).
Driving abroad
If you plan to drive the vehicle outside the U.S.
or Canada, you should request dealer
network information for your destination from
any authorized Mercedes-Benz Center.
Control and operation of radio
transmitter
Safety notes
GWarning!
Please do not forget that your primary
responsibility is to drive the vehicle. A driver’s
attention to the road must always be his/her
primary focus when driving. For your safety
and the safety of others, we recommend that
you pull over to a safe location and stop
before placing or taking a telephone call.
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Display messagesPossible causes/consequences and M SolutionsFront
Passenger
Airbag
Enabled
See
Operator’s
ManualUSA only:
The front passenger front air bag is activated while driving
even though a child, small individual, or object below the
system’s weight threshold is on the front passenger seat, or
the front passenger seat is empty. Objects on the seat or
forces acting on the seat may make the system sense
supplemental weight.XStop the vehicle in a safe location as soon as possible.XEngage the parking brake.XSwitch off the ignition.XOpen the front passenger door.XRemove child and child restraint from front passenger seat
and properly secure the child in rear seat employing the
child restraint if necessary.XRemove any other items from on and around the front
passenger seat and make sure the parcel net on the back
of the front passenger seat is empty.XMake sure no objects which apply forces to the seat are
present (e.g. objects such as books, briefcases etc. lodged
behind or around the seat, head restraints pushing against
roof etc.). The system may recognize such forces as
supplemental weight and sense that an occupant on the
front passenger seat is of a greater weight than actually
present.XKeep the seat unoccupied, close the front passenger door
and switch on the ignition.
Monitor the 42 indicator lamp in the center
console ( Y page 45) and the multifunction display in the
instrument cluster ( Y page 28) for the following:
With the seat unoccupied and the ignition switched on,
R the 42 indicator lamp in the center console
should illuminate and remain illuminated, indicating that
the OCS ( Y page 42) has deactivated the front passenger
front air bag.
R the message Front Passenger Airbag Enabled See
Operator’s Manual or the message Front Passenger
Airbag Disabled See Operator’s Manual should not
appear in the multifunction display at any time the seat is
unoccupied. Wait at least 60 seconds for the system to
complete the necessary check cycles and to make sure
neither message appears in the multifunction display.
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Display messagesPossible causes/consequences and M SolutionsFront
Passenger
Airbag
Disabled
See
Operator’s
ManualUSA only:
The front passenger front air bag is deactivated while driving
even though an adult or someone larger than a small
individual is occupying the front passenger seat. Forces
acting on the seat may make the system sense a decrease in
weight.XStop the vehicle in a safe location as soon as possible.XEngage the parking brake.XSwitch off the ignition.XHave the front passenger vacate the seat and exit the
vehicle.XAdjust the seat height to a higher position ( Y page 82).XMake sure no objects which apply forces to the seat are
present (e.g. objects such as books, briefcases etc. lodged
underneath, behind or around the seat). Such forces may
cause the system to sense that an occupant of a lesser
weight than actually present is on the front passenger seat.XKeep the seat unoccupied, close the front passenger door
and switch on the ignition.
Monitor the 42 indicator lamp in the center
console ( Y page 45) and the multifunction display in the
instrument cluster ( Y page 28) for the following:
With the seat unoccupied and the ignition switched on,
R the 42 indicator lamp in the center console
should illuminate and remain illuminated, indicating that
the OCS ( Y page 42) has deactivated the front passenger
front air bag.
R the message Front Passenger Airbag Enabled See
Operator’s Manual or the message Front Passenger
Airbag Disabled See Operator’s Manual should not
appear in the multifunction display at any time the seat is
unoccupied. Wait at least 60 seconds for the system to
complete the necessary check cycles and to make sure
neither message appears in the multifunction display.
If above conditions are met, you can occupy the front
passenger seat again. Depending on the front passenger
classification sensed by the OCS, the 42
indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working
properly. Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
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VehicleDisplay messagesPossible causes/consequences and M SolutionsDepress
brake to
shift out
of P.You have attempted to shift the automatic transmission into
drive position D, reverse gear R or neutral position N without
depressing the brake pedal.XDepress the brake pedal.Door OpenVehicle
Not In
ParkYou have opened the driver’s door and the automatic
transmission is still in drive position D, reverse gear R or
neutral position N.XBefore you leave the vehicle, make sure the automatic
transmission is in park position P and the parking brake is
engaged.Drive to
workshop
without
shifting
gears.The automatic transmission cannot be shifted out of the
current transmission position because of a malfunction.
If the automatic transmission is in drive position D:XWithout shifting the automatic transmission out of drive
position D, drive to an authorized Mercedes-Benz Center.
If the automatic transmission is set to neutral position N,
reverse gear R or park position P:
XDo not drive.XContact an authorized Mercedes-Benz Center or call
Roadside Assistance.Only
shift to
P when
vehicle
is at a
standstill
.You have attempted to shift the automatic transmission into
park position P although the vehicle was still in motion.XStop the vehicle.Shift to
P or N to
start
engine.You have attempted to start the engine with the KEYLESS-GO
start/stop button while the automatic transmission was in
reverse gear R or drive position D.XShift the automatic transmission into park position P or
neutral position N. Make sure the brake pedal is depressed.Auxiliary
BatteryMalfunctio
nThe backup battery for the automatic transmission is no
longer charging.XContact an authorized Mercedes-Benz Center.280Vehicle status messages in the multifunction displayPractical hints
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Display messagesPossible causes/consequences and M Solutions$
(USA only)
J
(Canada
only)EBV, ABS,
ESP
Inoperativ
e See
Operator’s
ManualThe brake system is still functioning normally but due to a
malfunction, the ABS, the BAS, the EBP, the ESP ®
, and the
PRE-SAFE ®
system are unavailable.XContinue driving with added caution. Wheels may lock
during hard braking, reducing steering capability.XAdjust driving to be consistent with reduced braking
responsiveness.XHave the system checked at an authorized Mercedes-Benz
Center as soon as possible.$
(USA only)
!
(Canada
only)Release
Parking
BrakeYou are driving with the parking brake engaged. In addition
an acoustic warning sounds.XRelease the parking brake.$
(USA only)
J
(Canada
only)Check
Brake
Fluid
LevelThere is insufficient brake fluid in the reservoir.
Risk of accident!XStop the vehicle in a safe location or as soon as it is safe
to do so.XEngage the parking brakeXDo not drive any further.XContact an authorized Mercedes-Benz Center or call
Roadside Assistance.
Do not add brake fluid! This will not solve the problem.
GWarning!
Driving with the message Check Brake Fluid Level displayed can result in an accident. Have
your brake system checked immediately.
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.
! If you find that the brake fluid in the brake fluid reservoir has fallen to the minimum mark
or below, have the brake system checked for brake pad thickness and leaks.
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Display messagesPossible causes/consequences and M Solutions+Remove KeyYou have forgotten to remove the SmartKey.XRemove the SmartKey from the starter switch.+You need
a new key.The SmartKey is malfunctioning.XContact an authorized Mercedes-Benz Center.+Key Does
Not
Belong to
VehicleThe SmartKey in the starter switch does not belong to the
vehicle.XFind the SmartKey that belongs to the vehicle to operate
the vehicle.+Change
Key
BatteriesThe batteries in the SmartKey with KEYLESS-GO are
discharged.XReplace the batteries ( Y page 309).+Key Not
Detected
(message
appears in
red)The SmartKey with KEYLESS-GO is not detected while the
engine is running because the SmartKey is not in the vehicle.XStop the vehicle as soon as it is safe to do so.XEngage the parking brake.XSearch for the SmartKey.
The vehicle cannot be locked centrally nor can the engine
be started again after the engine is stopped.+Key Not
Detected
(message
appears in
red)The SmartKey with KEYLESS-GO is not detected while the
engine is running because there is strong radio-frequency
interference.XStop the vehicle as soon as it is safe to do so.XEngage the parking brake.XRemove the KEYLESS-GO button from the starter switch
( Y page 80).XOperate the vehicle with the SmartKey in the starter switch.+Key Not
Detected
(message
appears in
white)The SmartKey with KEYLESS-GO is momentarily not detected.XChange the position of the SmartKey in the vehicle.XIf necessary, remove the KEYLESS-GO button from the
starter switch ( Y page 80).XOperate the vehicle with the SmartKey in the starter switch.+Pull
starting
button
out then
insert
key.The SmartKey with KEYLESS-GO is permanently not detected.XRemove the KEYLESS-GO button from the starter switch
( Y page 80).XOperate the vehicle with the SmartKey in the starter switch.XContact an authorized Mercedes-Benz Center.Vehicle status messages in the multifunction display287Practical hints164_AKB; 7; 31, en-USd2ureepe,Version: 2.11.8.12009-09-11T12:07:36+02:00 - Seite 287Z
Display messagesPossible causes/consequences and M Solutions?Coolant
Stop car,
switch
engine
off.The coolant is too hot.XStop the vehicle immediately as soon as it is safe to do so.XTurn off the engine immediately.XEngage the parking brake.XOnly start the engine again after the message disappears.
You could otherwise damage the engine.XObserve the coolant temperature in the multifunction
display.XIf the temperature rises again: Contact an authorized
Mercedes-Benz Center immediately.
During severe operation conditions and stop-and-go city
traffic, the coolant temperature may rise close to 248‡
(120†).
GWarning!
Driving when your engine is overheated can cause some fluids which may have leaked into the
engine compartment to catch fire. You could be seriously burned.
Steam from an overheated engine can cause serious burns which can occur just by opening the
engine hood. Stay away from the engine if you see or hear steam coming from it.
Stop the vehicle in a safe location away from other traffic. Turn off the engine, get out of the
vehicle and do not stand near the vehicle until the engine has cooled down.
! The engine should not be operated with the coolant temperature above 248‡ (120†).
Doing so may cause serious damage which is not covered by the Mercedes-Benz Limited
Warranty.
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