
Headlamps fogged up on the inside
The headlamps may fog up on the inside if
there is high atmospheric humidity.
X Switch on the low-beam headlamps and
drive off.
The level of moisture diminishes, depend-
ing on the length of the journey and the
weather conditions (humidity and temper-
ature).
If the level of moisture does not diminish:
X Have the headlamps checked at a qualified
specialist workshop. Interior lighting
Switching the dashboard lighting on/
off
Overview Standard interior light
0047 Interior light switched on
0048 Interior light switched off
0049 Automatic control system switched on Interior lights in the overhead control panel
0043
Switches the left-hand reading lamp
on/off
0044 Switches the right-hand reading lamp on/
off
0087 Right-hand reading lamp
0085 Interior light
0083 Switches the automatic control system
on/off
0084 Switches the interior light on/off
006B Left-hand reading lamp
If you manually switch on the interior lighting
or reading lamps on the overhead control
panel, they switch off automatically after
20 minutes.
Automatic control The interior light comes on if you:
R unlock the vehicle
R open the driver's or the co-driver's door
R remove the key from the ignition lock
The interior light switches off again automat- ically.
If a door is left open, the interior lighting
switches off after approximately 20 minutes. Interior lighting
97Lights and windshield wipers Z

Battery isolating switch
Important safety notes !
Make sure that the key is in position
0in
the ignition lock and wait at least 20 sec-
onds before disconnecting or connecting
the battery isolating switch. You could oth-
erwise damage electrical system compo-
nents.
You can use the battery isolating switch to
disconnect the power supply to all your vehi- cle's consumers. This will prevent uncontrol-
led battery discharge caused by off-load cur-
rent consumption.
If your vehicle is equipped with an auxiliary
battery in the engine compartment, you will
need to disconnect both batteries. Only then
is the electrical system fully disconnected
from the power supply.
i Only switch the vehicle to de-energized
using the battery main switch if:
R the vehicle is stationary for a lengthy
period
R it is absolutely necessary
After the power supply has been activated,
you will need to reset the side windows
(Y page 79).
Switching off the power supply !
When you clamp the connector under the
accelerator pedal, make sure that the con- nector does not become damaged or dirty.
It may otherwise not be possible to restore
the electrical connection when the parts
are reassembled. Battery isolating switch in the driver's footwell, on
the right-hand side next to the accelerator pedal
X Remove the key from the ignition lock and
wait for about 20 seconds.
X Press button 0044in the direction of the
arrow and hold.
X Pull connector 0043from the earth pin.
X Clamp connector 0043under the accelerator
pedal so that it cannot make contact with
the earth pin.
All starter battery consumers are discon-
nected from the power supply.
Switching on the power supply X
Insert the key into the ignition lock.
X Press connector 0043onto earth pin 0044until
you feel it engage and the lock inhibitor is
released.
Connector 0043must be in full contact with
earth pin 0044.
All consumers are reconnected to the DC
power supply. Driving
137Driving an d parking Z

Problems with the engine
Problem
Possible causes/consequences and
0050
0050Solutions The engine does not
start.
The starter motor can
be heard. There is air in the fuel system.
X Turn the key back to position 0in the ignition lock before
attempting to start the engine again.
X Start the engine again.
Please bear in mind that lengthy and frequent starting attempts
will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start.
The starter motor can
be heard. The reserve
fuel warning lamp is lit
and the fuel gage is at
0. The fuel tank has been run dry.
X Refuel the vehicle.
If you drive until the fuel tank is completely empty, air may get into
the fuel system. If the engine does not start after refueling, bleed the fuel system as follows:
X Turn the key to position 2in the ignition for approximately
10 seconds.
X Start the engine continuously for a maximum of 60 seconds.
If the engine does not start:
X Wait approximately 2 minutes.
X Restart the engine continuously for a maximum of 60 seconds.
X If the engine still fails start, do not continue trying to start it.
X Consult a qualified specialist workshop. The vehicle cannot be
driven at a speed
exceeding 5 mph
(8 km/h).
The yellow
00B9engine
diagnostic lamp and
the yellow 00E2DEF
indicator lamp 2
light
up. The exhaust gas aftertreatment is faulty, an emission-relevant
malfunction has occurred or the DEF reserve has been used up.
This malfunction or defect can damage the exhaust gas after-
treatment.
X Observe the messages in the display:
R on vehicles without steering-wheel buttons (Y page 200)
R on vehicles with steering-wheel buttons (Y page 211) and
(Y page 211). The engine does not
start.
The starter motor can-
not be heard. The battery isolating switch is switched off.
X Switch on the power supply (Y page 137).2
Only vehicles without steering-wheel buttons. Driving
141Driving and parking Z

X
Remove the objects that are preventing the
trailer from rolling, e.g. wheel chocks.
X Release the trailer parking brake.
i The subharness of the vehicle has a cable
connection to the brake lamp indicator
lamp.
Observe the maximum permissible trailer
dimensions (width and length).
Most federal states and all Canadian provin-
ces require by law:
R safety chains between the towing vehicle
and the trailer. The chains should be cross-
wound under the trailer drawbar. They must be fastened to the vehicle's trailer cou-
pling, not to the bumper or the axle.
Leave enough slack in the chains. This
allows you to drive round tight corners.
R a separate brake system for certain types
of trailer.
R a safety switch for braked trailers. Find out
the specific requirements according to the
applicable laws.
If the trailer detaches from the towing vehi- cle, the safety switch applies the trailer's
brakes. Towing a trailer
There are numerous legal requirements con-
cerning the towing of a trailer, e.g. speed
restrictions. Make sure your vehicle/trailer
combination complies with local laws. This
not only means where you live, but also any-
where you are driving to. Information is avail-
able from the police and local authorities.
Observe the following when towing a trailer:
R Practice driving around bends, stopping
and backing up at a place where there is no
traffic. This enables you to gain experience and get used to the new handling charac-
teristics.
R Before driving, check:
- that the trailer tow hitch and ball cou-
pling are secure
- that the safety switch for a braked trailer
is functioning properly
- that the safety chains are secure and not
damaged
- that the electrical connections are
secure
- that the lights are working
- that the wheels are in good order and the
tire pressure is correct
R Adjust the exterior mirrors to provide an
unobstructed view of the rear section of the
trailer.
R If the trailer has electronically controlled
brakes, pull the vehicle/trailer combina-
tion away carefully. Brake manually using
the brake controller and check that the
brakes are working.
R Secure the load on the trailer according to
the applicable specifications and current
standards on securing loads (Y page 242).
R When driving with a trailer, check at regular
intervals that the load is secured and that
the brakes and lights are working.
R Bear in mind that the handling will be less
stable when towing a trailer than when driv-
ing without one. Avoid sudden steering
movements.
R The vehicle/trailer combination is heavier,
accelerates more slowly and has a
decreased gradient climbing capability and
a longer braking distance.
It is more susceptible to crosswinds and
requires cautious steering.
R If possible, do not brake suddenly, but
rather moderately at first so that the trailer
can activate its brakes. Then increase the
force on the brake pedal.
R If the automatic transmission repeatedly
shifts between gears when driving on 176
Towing a trailerDriving and pa
rking

inclines, restrict the shift range. Select shift
range 4,3, 2or 1.
Driving in a low gear and at a low speed
reduces the risk of damaging the engine.
R When driving on a downhill gradient, shift to
a low gear and take advantage of the
engine's braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if
installed, the trailer brakes.
R If the coolant temperature increases dra-
matically while the air-conditioning system
is switched on, switch off the air-condition-
ing system.
Coolant heat can also be dissipated by
switching the airflow and the temperature
of the heater/air conditioning to the maxi-
mum level. Open the windows if necessary.
R When overtaking, pay particular attention
to the extended length of your vehicle/
trailer combination.
Due to the length of your vehicle/trailer
combination you need an additional dis-
tance before you can return to your original
lane. Uncoupling a trailer
G
WARNING
If you uncouple a trailer with the overrun
brake engaged, you could trap your hand
between the vehicle and the trailer drawbar.
There is a risk of injury.
Do not uncouple a trailer if the overrun brake is engaged.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound- ing of the overrun brake.
X Make sure the selector lever of the auto-
matic transmission is in position P.
X Apply the parking brake of the vehicle.
X Close all doors. X
Apply the parking brake of the trailer.
X In addition, secure the trailer against rolling
away with a wheel chock or similar object.
X Remove the trailer cable and safety chains
and decouple the trailer. Permissible trailer loads and trailer
drawbar noseweights
Weight information !
On vehicles with a permissible gross vehi-
cle weight of 11030 lbs (5003 kg), the per- missible gross combination weight is less
than the total of the permissible gross vehi-
cle weight and the permissible trailer load.
Exceeding the permissible gross combina-
tion weight can lead to damage to the driv-
etrain, to the transmission or to the trailer
tow hitch.
If the vehicle or the trailer is fully laden, the relevant value for the permissible gross
vehicle weight or the permissible trailer
load is therefore lower. In this case, the
trailer or the vehicle may only be partially
loaded.
The gross trailer weight (GTW) is calculated by adding the weight of the trailer to the weight
of the load and equipment.
The maximum gross vehicle weight is vehicle-specific and equipment-dependent: 5,000 lbs
(2,268 kg) or 7,500 lbs (3,402 kg).
The maximum perm issible trailer drawbar
noseweight on the ball coupling is 500 lbs
(227 kg) or 750 lbs (340 kg). Theactual nose-
weight may not exceed the value given on the
identification plates of the trailer tow hitch or
the trailer. If the values vary, the lowest value always applies.
The gross combination weight rating (GCWR)is calculated by adding the gross weight of the
trailer to the gross vehicle weight including a
driver's weight of approximately 150 lbs
(68 kg). The permissible Gross Combination
Weight Rating is vehicle-specific and depends
on the equipment level. Towing a trailer
177Driving and parking Z

Maximum permitted weights and loads
!
On vehicles with a permissible gross vehicle weight of 11030 lbs (5003 kg), the permissible
gross combination weight is less than the total of the permissible gross vehicle weight and the permissible trailer load. Exceeding the permissible gross combination weight can lead to
damage to the drivetrain, to the transmission or to the trailer tow hitch.
If the vehicle or the trailer is fully laden, the relevant value for the permissible gross vehicle weight or the permissible trailer load is therefore lower. In this case, the trailer or the vehicle may only be partially loaded.
The permissible weights and loads which cannot be exceeded can also be found: R in your vehicle documents and
R on the identification plates of the trailer tow hitch, the trailer and the vehicle (Y page 316).
You will find the basic values approved by the manufacturer in the following table. If the values
differ, the lowest value applies.
Make sure that you adhere to the weight restrictions by having the weight checked on a
calibrated weighbridge. Vehicle
type Permissi-
ble gross
weight
GVWR Gross
front axle
load
GAWR
(FA) Gross
rear axle
load
GAWR
(RA) Maximum
permissi-
ble gross
weight of
vehicle/
trailer
combina-
tion
14
GCWR Trailer
load
15
GTW Maxi-
mum per-
missible
nose
weight
TWR
2500
8550 lbs
(3878 kg) 3970 lbs
(1801 kg) 5360 lbs
(2431 kg) 13550 lbs
(6146 kg) 5000 lbs
(2268 kg) 500 lbs
(227 kg) 3500
9900 lbs
(4490 kg) Canada only 4080 lbs
(1851 kg) 7060 lbs
(3202 kg) 14900 lbs
(6759 kg) 16 5000 lbs
(2268 kg) 16 500 lbs
(227 kg) 16 4410 lbs
(2000 kg) 15250 lbs
(6917 kg) 17 7500 lbs
(3402 kg) 17 750 lbs
(340 kg) 17 9990 lbs
(4531 kg) USA only 4080 lbs
(1851 kg) 7060 lbs
(3202 kg) 14990 lbs
(6799 kg) 16 5000 lbs
(2268 kg) 16 500 lbs
(227 kg) 16 4410 lbs
(2000 kg) 15250 lbs
(6917 kg) 17 7500 lbs
(3402 kg) 17 750 lbs
(340 kg) 17 10141 lbs
(4600 kg) 4080 lbs
(1851 kg) 7060 lbs
(3202 kg) 14990 lbs
(6799 kg) 16 5000 lbs
(2268 kg) 16 500 lbs
(227 kg) 16 14
Maximum permissible gross weight of the vehicle and trailer
15 Maximum permissible gross weight of the trailer
16 Only for extra-long vehicles with an overall length of 289.2 in (7344 mm).
17 Not for extra-long vehicles with an overall length of 289.2 in (7344 mm). 330
Vehicle dataTechnical data

Vehicle
type Permissi-
ble gross
weight
GVWR Gross
front axle
load
GAWR
(FA) Gross
rear axle
load
GAWR
(RA) Maximum
permissi-
ble gross
weight of
vehicle/
trailer
combina-
tion 14
GCWR Trailer
load
15
GTW Maxi-
mum per-
missible
nose
weight
TWR
4410 lbs
(2000 kg) 15250 lbs
(6917 kg) 17 7500 lbs
(3402 kg) 17 750 lbs
(340 kg) 17 11030 lbs
(5003 kg) 4080 lbs
(1851 kg) 7720 lbs
(3502 kg) 15250 lbs
(6917 kg) 5000 lbs
(2268 kg) 16 500 lbs
(227 kg) 16 4410 lbs
(2000 kg) 7500 lbs
(3402 kg) 17 750 lbs
(340 kg) 17 14
Maximum permissible gross weight of the vehicle and trailer
15 Maximum permissible gross weight of the trailer
17 Not for extra-long vehicles with an overall length of 289.2 in (7344 mm).
16 Only for extra-long vehicles with an overall length of 289.2 in (7344 mm). Vehicle data
331Technical data Z