Page 36 of 539

35 Getting started
Unlocking
SmartKey with KEYLESS-GO*
Vehicles equipped with the KEYLESS-GO 
feature are supplied with a SmartKey with 
integrated KEYLESS-GO function and a 
removable KEYLESS-GO start/stop 
button.With the KEYLESS-GO start/stop button 
inserted and the SmartKey with 
KEYLESS-GO present in the vehicle, press-
ing the KEYLESS-GO start/stop button
without the brake pedal depressed cor-
responds to the various starter switch 
positions (
page 36)
with the brake pedal firmly depressed 
will start the engine (
page 49)
If you wish or should there be a need to 
insert the SmartKey with KEYLESS-GO in 
the starter switch, the start/stop button 
can be easily removed by pulling it out of 
the starter switch.
!If the SmartKey cannot be turned in the 
starter switch, the battery may not be 
sufficiently charged.
Check the battery and charge it if 
necessary (
page 440).
Get a jump start (
page 470).
To prevent accelerated battery dis-
charge or a completely discharged bat-
tery, always remove the SmartKey from 
the starter switch when the engine is 
not in operation.
iIf you firmly depress the brake pedal 
while pressing the KEYLESS-GO 
start/stop button, the engine starts 
automatically.
iThe KEYLESS-GO start/stop button 
does not need to be removed from the 
starter switch when you leave the vehi-
cle. However, always take the 
SmartKey with KEYLESS-GO with you 
when you leave the vehicle. As long as 
the SmartKey with KEYLESS-GO is in 
your vehicle, the vehicle’s electrical 
systems can be switched on or the 
engine can be started using the 
KEYLESS-GO start/stop button.Warning!
G
When leaving the vehicle, always take the 
SmartKey with KEYLESS-GO with you and 
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an 
unlocked vehicle. Unsupervised use of vehi-
cle equipment may cause an accident 
and/or serious personal injury. 
         
        
        
     
        
        Page 37 of 539

36 Getting startedUnlocking1KEYLESS-GO start/stop button
2Starter switchKEYLESS-GO start/stop button1USA only
2Canada onlyThe SmartKey with KEYLESS-GO must be 
located in the vehicle.
Make sure the automatic transmission 
is set toP.
Do not depress the brake pedal.
Position 0
Before you press the KEYLESS-GO 
start/stop button, the vehicle’s on-board 
electronics have status0 (as with 
SmartKey removed).
Position 1
Press the KEYLESS-GO start/stop 
button once.
This supplies power for some electrical 
consumers, such as seat adjustment.Ignition (or Position 2)
Press the KEYLESS-GO start/stop 
button twice.
All lamps in the instrument cluster 
come on. If a lamp in the instrument 
cluster fails to come on when the igni-
tion is switched on, have it checked 
and replaced if necessary. If a lamp in 
the instrument cluster remains on after 
starting the engine or comes on while 
driving, refer to “Lamps in instrument 
cluster” (
page 382).
iIf you now press the KEYLESS-GO 
start/stop button
once more, the ignition (position2) 
is switched on
twice more, the power supply is 
again switched off 
         
        
        
     
        
        Page 38 of 539
37 Getting started
Unlocking
For information on starting the engine 
using the KEYLESS-GO start/stop button, 
see “Starting with KEYLESS-GO*” 
(page 50).iIf you now press the KEYLESS-GO 
start/stop button once more, the 
power supply is again switched off.iWhen you switch on the ignition, the 
indicator and warning lamps (except 
high beam headlamp indicator lamp 
and turn signal indicator lamps unless 
activated) in the instrument cluster 
come on. The indicator and warning 
lamps (except high beam headlamp in-
dicator lamp and turn signal indicator 
lamps if activated) should go out when 
the engine is running. This indicates 
that the respective systems are 
operational. 
         
        
        
     
        
        Page 51 of 539

50 Getting startedDrivingStarting with the SmartKey
Make sure the automatic transmission 
is set toP.
The transmission gear positionP 
appears in the multifunction display.
Do not depress accelerator.
Turn the SmartKey in the starter switch 
to position3 (
page 34) and hold until 
the engine starts.
For information on turning off the engine 
with the SmartKey, see “Turning off en-
gine” (
page 62).Starting with KEYLESS-GO*
You can start your vehicle without the 
SmartKey in the starter switch using the 
KEYLESS-GO start/stop button in the 
starter switch.
The SmartKey with KEYLESS-GO must be 
located in the vehicle.
KEYLESS-GO start/stop button1USA only
2Canada only
Make sure the KEYLESS-GO start/stop 
button1 is inserted in the starter 
switch (
page 35).
Make sure the automatic transmission 
is set toP.
Depress the brake pedal during the 
starting procedure. Do not depress ac-
celerator.
iYou can also use the “touch-start” 
function. Turn the SmartKey to 
position3 and release it again immedi-
ately. The engine then starts automati-
cally.
Warning!
G
As long as the SmartKey with KEYLESS-GO 
is in your vehicle, the vehicle can be started. 
Therefore, never leave children unattended 
in the vehicle, as they could otherwise acci-
dentally start the engine.
When leaving the vehicle, always take the 
SmartKey with KEYLESS-GO with you and 
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an 
unlocked vehicle. 
         
        
        
     
        
        Page 52 of 539

51 Getting started
Driving
Press KEYLESS-GO start/stop 
button1 once.
The engine starts if the SmartKey with 
KEYLESS-GO is in the vehicle.
For information on turning off the engine 
with KEYLESS-GO, see “Turning off with 
KEYLESS-GO*” (
page 63).Starting difficulties
If the engine does not start as described, 
carry out the following steps:
If you are starting the engine with the 
SmartKey, turn SmartKey in starter 
switch to position0 and repeat starting 
procedure.
If you are starting the engine with 
KEYLESS-GO*: Close any doors that 
may be open to allow for better 
detection of the SmartKey with 
KEYLESS-GO*.
Or:
Remove KEYLESS-GO* start/stop but-
ton from starter switch.
Start the engine with the SmartKey as 
radio signals from another source may 
be interfering with the SmartKey with 
KEYLESS-GO*.
Repeat the starting procedure 
(page 49). Remember that extended 
starting attempts can drain the battery.
Get a jump start (
page 470).
If the engine does not start after several 
starting attempts, there could be a mal-
function in the engine electronics or in the 
fuel supply system.
Notify an authorized Mercedes-Benz 
Light Truck Center.
iIf you wish to start the engine using the 
SmartKey instead of the KEYLESS-GO 
feature, remove the KEYLESS-GO* 
start/stop button from starter switch 
(page 35). 
         
        
        
     
        
        Page 58 of 539

57 Getting started
Driving
Rear window wiper/washer
The combination switch is located on the 
left of the steering column.Combination switch1Rear window wiper switch
2Wiping rear window with washer fluid
3Intermittent wiping
4Rear window wiper off
5Wiping rear window with washer fluid
!If anything blocks the windshield wip-
ers (leaves, snow, etc.), switch them off 
immediately.
For safety reasons, stop the vehicle in 
a safe location and
turn off the engine by turning 
the SmartKey to position0 and 
withdraw SmartKey from starter 
switch
or
turn off the engine by pressing 
the KEYLESS-GO* start/stop 
button and open the driver’s 
door (with the driver’s door 
open, starter switch is in 
position0, same as with 
SmartKey removed from starter 
switch)
before attempting to remove any 
blockage.
Remove blockage.
Turn the windshield wipers on 
again.
If windshield wipers fail to function at 
all in switch positionI,
set the combination switch to the 
next highest wiper speed
have the windshield wipers 
checked at the nearest authorized 
Mercedes-Benz Light Truck Center
 
         
        
        
     
        
        Page 61 of 539

60 Getting startedParking and lockingYou have now completed your first drive. 
You have properly stopped and parked 
your vehicle. End your drive as follows.Warning!
G
With the engine not running, there is no 
power assistance for the brake and the 
steering system. In this case, it is important 
to keep in mind that a considerably higher 
degree of effort is necessary to brake and 
steer the vehicle.
Warning!
G
Do not park this vehicle in areas where com-
bustible materials such as grass, hay or 
leaves can come into contact with the hot 
exhaust system, as these materials could be 
ignited and cause a vehicle fire.
To reduce the risk of personal injury as a re-
sult of vehicle movement, before turning off 
the engine and leaving the vehicle always:
Keep right foot on brake pedal.
Firmly depress parking brake pedal.
Shift the automatic transmission to 
positionP.
Slowly release brake pedal.
When parked on an incline, turn front 
wheel towards the road curb.
Turn the SmartKey to starter switch 
position0 and remove, or press 
start/stop button (vehicles with 
KEYLESS-GO*).
Take the SmartKey or the SmartKey with 
KEYLESS-GO* and lock vehicle when 
leaving. 
         
        
        
     
        
        Page 64 of 539

63 Getting started
Parking and locking
After exiting the vehicle, press the lock 
button‹ on the SmartKey 
(page 32).
The turn signal lamps flash three times. 
The locking knobs on the doors move 
down. The anti-theft alarm system is 
armed.
For more information, see “Locking and 
unlocking” (
page 106).Turning off with KEYLESS-GO*
Shift automatic transmission to 
positionP.
Press the KEYLESS-GO start/stop 
button to shut off the engine.
With the driver’s door closed, the start-
er switch is now in position1. With the 
driver’s door opened, the starter switch 
is set to position0, same as SmartKey 
removed from starter switch 
(page 34).
Press the seat belt release button.
Allow the retractor to completely 
rewind the seat belt by guiding the 
latch plate.
Warning!
G
When leaving the vehicle, always remove the 
SmartKey or SmartKey with KEYLESS-GO* 
from the starter switch, take it with you, and 
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an 
unlocked vehicle. Unsupervised use of vehi-
cle equipment may cause an accident 
and/or serious personal injury.
iIf you turn off the engine using the 
KEYLESS-GO start/stop button and 
open the driver’s door with the trans-
mission in a position other thanP, the 
transmission will automatically shift 
toP.
Keep in mind that turning off the engine 
with the KEYLESS-GO start/stop 
button alone will not automatically shift 
the transmission toP. Only when the 
driver’s door is opened will the trans-
mission automatically shift toP.