Page 30 of 400
30 Getting startedUnlocking
The “Getting started” section provides an 
overview of the vehicle’s most basic func-
tions. First-time Mercedes-Benz owners 
should pay special attention to the infor-
mation given here.
If you are already familiar with the basic 
functions described here, the “Controls in 
detail” section will provide you with further 
information. The corresponding page 
references are located at the end of each 
segment.
Unlocking
Unlocking with the SmartKeySmartKey with remote control 1‹Lock button
2ŠOpening button for the trunk lid
3ŒUnlock button
4ÂPanic button* (
page 71)
Press unlock buttonŒ on the 
SmartKey.
All turn signal lamps flash once. The 
locking knobs in the doors move up.
Get in the vehicle and insert the 
SmartKey in the starter switch.
For more information, see “Locking and 
unlocking” (
page 82).
iCanada only:
Only vehicles equipped with an 
anti-theft alarm system* have 
SmartKeys with integrated panic 
button*4. 
     
        
        Page 31 of 400

31 Getting started
Unlocking
Starter switch positionsStarter switch0For removing SmartKey
The steering is locked when the 
SmartKey is removed from the starter 
switch. If necessary, move steering 
wheel slightly to allow the locking 
mechanism to engage.
1Power supply to some electrical 
consumers, such as seat adjustment
2Ignition (power supply for all electrical 
consumers) and driving position
3Starting position
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch and lock 
the vehicle. Do not leave children unattend-
ed in the vehicle, or with access to an un-
locked vehicle. Unsupervised use of vehicle 
equipment may cause an accident and/or 
serious personal injury.iVehicles with automatic transmission: 
The SmartKey can only be removed 
from the starter switch with the gear 
selector lever in positionP.
!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 323).
Get a jump start (
page 326).
To prevent accelerated battery 
discharge and a possible dead battery, 
always remove the SmartKey from the 
starter switch when the engine is not in 
operation. 
     
        
        Page 32 of 400

32 Getting startedAdjusting
AdjustingSeats
The seats can be adjusted either manually 
or electrically, depending on the vehicle’s 
equipment.Warning!
G
All seat, head restraint, steering wheel, and 
rear view mirror adjustments, as well as fas-
tening of seat belts, must be done before 
the vehicle is put into motion.Warning!
G
Do not adjust the driver’s seat while driving. 
Adjusting the seat while driving could cause 
the driver to lose control of the vehicle.
Never ride in a moving vehicle with the seat 
back reclined. Sitting in an excessively re-
clined position can be dangerous. You could 
slide under the seat belt in a collision. If you 
slide under it, the belt would apply force at 
the abdomen or neck. 
That could cause serious or fatal injuries. 
The seat back and seat belts provide the 
best restraint when the wearer is in an up-
right position and belts are properly posi-
tioned on the body. Your seat must be 
adjusted so that you can correctly fasten 
your seat belt (
page 40).
Never place hands under the seat or near 
any moving parts while a seat is being ad-
justed.
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, and lock 
your vehicle.
The power seats* can also be operated with 
the driver’s or front passenger door open. 
Do not leave children unattended in the ve-
hicle, or with access to an unlocked vehicle. 
Unsupervised use of vehicle equipment may 
cause an accident and/or serious personal 
injury.
Warning!
G
Children 12 years old and under must never 
ride in the front seat, except in a 
Mercedes-Benz authorized BabySmart
TM1
 
compatible child seat, which operates with 
the BabySmart
TM system installed in the ve-
hicle to deactivate the passenger front air-
bag when it is properly installed. Otherwise 
they will be struck by the airbag when it in-
flates in a crash. If this happens, serious or 
fatal injury will result.
According to accident statistics, children 
are safer when properly restrained in the 
rear seating positions than in the front seat-
ing positions. Infants and small children 
must ride in back seats and be seated in an 
appropriate infant or child restraint system, 
which is properly secured with the vehicle’s 
seat belt and top tether strap, or secured via 
lower anchors and top tether strap, fully in 
accordance with the child seat manufactur-
er’s instructions.
1BabySmart
TM is a trademark of Siemens 
Automotive Corp. 
     
        
        Page 34 of 400
34 Getting startedAdjustingHead restraint height
1Release button
Raising:
Manually adjust the height of the head 
restraint by pulling it upward.
Lowering:
To lower head the restraint, push 
release button1 and push down on 
the head restraint.Head restraint tilt
Manually adjust the angle of the head 
restraint.
Push or pull on the lower edge of the 
head restraint cushion.
For more information, see “Seats” 
(
page 92).
Warning!
G
For your protection, drive only with properly 
positioned head restraints.
Adjust head restraint so that the head 
restraint supports the back of the head at 
eye level. This will reduce the potential for 
injury to the head and neck in the event of 
an accident or similar situation.
Do not drive the vehicle without the seat 
head restraints. Head restraints are intend-
ed to help reduce injuries during an acci-
dent. 
     
        
        Page 35 of 400

35 Getting started
Adjusting
Power seat* adjustment
The seat adjustment switches are located 
in each front door.
1Head restraint height
2Seat height
3Seat cushion tilt
4Seat fore and aft adjustment
5Seat backrest tilt
Turn the SmartKey in the starter switch 
to position1 or2 (
page 31).
or
Open the driver’s or front passenger 
door.Seat fore and aft adjustment
Press switch forward or backward in 
direction of arrow4.
Adjust seat to a comfortable seating 
position that still allows you to reach the 
accelerator/brake pedal safely. The posi-
tion should be as far rearward as possible, 
consistent with ability to properly operate 
controls.Seat cushion tilt
Press switch up or down in direction of 
arrow3 until your upper legs are 
lightly supported.
Seat backrest tilt
Press switch forward or backward in 
direction of arrow5 until your arms 
are slightly angled when holding the 
steering wheel.
Seat height
Press switch up or down in direction of 
arrow2.
Head restraint height
Press switch up or down in direction of 
arrow1.
iWhen moving the seat, be sure that 
there are no items in the footwell or 
behind the seat. Otherwise you could 
damage the seat.
The memory function* (
page 99) lets 
you store the setting for the seat posi-
tion together with the settings for the 
steering wheel and exterior rear view 
mirrors. 
     
        
        Page 36 of 400

36 Getting startedAdjusting
Head restraint tilt
Manually adjust the angle of the head 
restraint.
Push or pull on the lower edge of the 
head restraint cushion.
For more information, see “Seats” 
(
page 92).
Steering wheel
Warning!
G
For your protection, drive only with properly 
positioned head restraints.
Adjust head restraint so that the head 
restraint supports the back of the head at 
eye level. This will reduce the potential for 
injury to the head and neck in the event of 
an accident or similar situation.
Do not drive the vehicle without the seat 
head restraints. Head restraints are 
intended to help reduce injuries during an 
accident.
Warning!
G
Do not adjust the steering wheel while 
driving. Adjusting the steering wheel while 
driving, or driving without the adjustment 
locked could cause the driver to lose control 
of the vehicle.
When leaving the vehicle, always remove the 
SmartKey from the starter switch and lock 
your vehicle.
The electrical steering wheel adjustment 
feature* can also be operated with the 
driver’s door open. Do not leave children 
unattended in the vehicle, or with access to 
an unlocked vehicle. Unsupervised use of 
vehicle equipment may cause an accident 
and/or serious personal injury. 
     
        
        Page 37 of 400
37 Getting started
Adjusting
Steering wheel adjustment, manual
1Handle
To unlock the steering column, pull 
handle1 out to its stop limit.
Move steering wheel to the desired 
position.
To lock the steering column, push 
handle1 all the way in until it 
engages.
The steering wheel is once again 
locked into position.Steering wheel adjustment, electrical*
The stalk for steering wheel adjustment is 
located on the steering column (lower left).
1Adjusting steering column, in or out
2Adjusting steering column, up or down
Turn the SmartKey in the starter switch 
to position1 or2 (
page 31).
or
Open the driver’s door.
!Do not drive the vehicle until you have 
properly locked the steering column.
If the warning message 
STEERING 
WHEEL ADJ. - LOCK!
 (page 298) is 
displayed while the engine is running, 
the steering column is not locked. 
     
        
        Page 38 of 400

38 Getting startedAdjustingAdjusting steering column in or out
Move stalk forward or back in the 
direction of arrow1 until a comfort-
able steering wheel position is reached 
with your arms slightly bent at the 
elbow.
Adjusting steering column up or down
Move stalk up or down in the direction 
of arrow2.
Make sure your legs can move freely 
and that all the displays (incl. malfunc-
tion and indicator lamps) on the instru-
ment cluster are clearly visible.
Mirrors
Adjust the interior and exterior rear view 
mirrors before driving so that you have a 
good view of the road and traffic condi-
tions.
Interior rear view mirror
Manually adjust the interior rear view 
mirror.
For more information, see “Rear view mir-
rors” (
page 149).Exterior rear view mirrors
iThe memory function* (
page 99) lets 
you store the setting for the steering 
wheel together with the settings for the 
seat position and exterior rear view 
mirrors.
Warning!
G
In the case of an accident, liquid electrolyte 
may escape the mirror housing if the mirror 
glass breaks.
Electrolyte has an irritating effect. Do not al-
low the liquid to come into contact with 
eyes, skin, clothing, or respiratory system. 
In case it does, immediately flush affected 
area with water, and seek medical help if 
necessary.
Warning!
G
Exercise care when using the passenger 
side exterior rear view mirror. The mirror 
surface is convex (outwardly curved surface 
for a wider field of view). Objects in mirror 
are closer than they appear. Check your in-
terior rear view mirror or glance over your 
shoulder before changing lanes. !Electrolyte drops coming into contact 
with the vehicle paint finish can only be 
completely removed while in their 
liquid state by applying plenty of water.