Page 37 of 506

36 Getting startedUnlockingPosition 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 but-
ton once.
This supplies power to some electrical 
consumers, such as seat adjustment.Ignition (or position 2)
Press the KEYLESS-GO start/stop but-
ton twice.
This supplies power to all electrical 
consumers. All the lamps (except low 
beam headlamp indicator lamp, high 
beam headlamp indicator lamp, and 
turn signal indicator lamps unless acti-
vated) in the instrument cluster come 
on. If a lamp in the instrument cluster 
fails to come on when the ignition is 
switched on, have it checked and re-
placed if necessary. If a lamp in the in-
strument cluster remains on after 
starting the engine or comes on while 
driving, refer to “Lamps in instrument 
cluster”(
page 354).For more information, see “SmartKey with 
KEYLESS-GO*” (
page 98).
For information on starting the engine 
using the KEYLESS-GO start/stop button, 
see “Starting with KEYLESS-GO*” 
(
page 47).
iIf you now press the KEYLESS-GO 
start/stop button 
once again, the ignition (position2) 
is switched on.
twice, the power supply is again 
switched off.
iIf you now press the KEYLESS-GO 
start/stop button once, the power sup-
ply is again switched off.
iWhen you switch on the ignition, the in-
dicator and warning lamps (except low 
beam headlamp indicator lamp, high 
beam headlamp indicator lamp, and 
turn signal indicator lamps unless acti-
vated) in the instrument cluster come 
on. This indicates that the respective 
systems are operational. The indicator 
and warning lamps (except low beam 
headlamp indicator lamp, high beam 
headlamp indicator lamp, and turn sig-
nal indicator lamps if activated) should 
go out when the engine is running. 
     
        
        Page 42 of 506

41 Getting started
Adjusting
Adjusting steering column in or out
Move stalk forward or back in the 
direction of arrow 1 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 arrow 2. 
Make sure your legs can move freely 
and all the displays (incl. malfunction 
and indicator lamps) on the instrument 
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 176).
Exterior rear view mirror
iThe memory function (
page 119) lets 
you store the setting for the steering 
wheel together with the setting 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.!Electrolyte drops coming into contact 
with the vehicle paint finish can only be 
completely removed while in their 
liquid state and by applying plenty of 
water.
Warning!
G
Exercise care when using the passen-
ger-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.
 
     
        
        Page 52 of 506
51 Getting started
Driving
Turn exterior lamp switch to 
positionB.
The low beam headlamp indicator 
lampB in the instrument cluster 
comes on (
page 24).
High beam
The combination switch is located on the 
left of the steering column.
Combination switch1High beam
2High beam flasher
Push combination switch in direction of 
arrow1.
The high beam headlamp indicator 
lampA in the instrument cluster 
comes on (
page 24).
Turn signals
The combination switch is located on the 
left of the steering column.Combination switch1Turn signals, right
2Turn signals, left
Press combination switch in direction 
of arrow1or2.
The corresponding turn signal indicator 
lampLorK in the instrument 
cluster flashes (
page 24).
The combination switch resets automati-
cally after major steering wheel move-
ments.
iTo signal minor directional changes 
such as changing lanes, press combi-
nation switch only to the point of resis-
tance and release. The corresponding 
turn signals will flash three times. 
     
        
        Page 61 of 506

60 Safety and SecurityOccupant safetyIn this section you will learn the most im-
portant facts about the restraint system 
components of the vehicle.
Seat belts (
page 67)
Child restraints (
page 72)
Lower anchors and tethers for children 
(LATCH) (
page 80)
Supplemental Restraint System (SRS) with
Air bags (
page 61)
Air bag control unit (with crash sen-
sors)
Emergency tensioning device (ETD) for 
seat belts (
page 70)Air bag system components with
Front passenger front air bag off indica-
tor lamp (
page 79)
Front passenger seat with Occupant 
Classification System (OCS) 
(page 75)
As independent systems, their protective 
functions work in conjunction with each 
other.The SRS system conducts a self-test when 
the ignition is switched on and in regular 
intervals while the engine is running. This 
facilitates early detection of malfunctions. 
The 
1
indicator lamp in the instrument 
cluster comes on when the ignition is 
switched on and goes out no later than a 
few seconds after the engine has been 
started.
The SRS components are in operational 
readiness if the 
1
indicator lamp is not 
lit when the engine is running.
A malfunction in the system has been 
detected if the 
1
indicator lamp:
fails to go out after approximately four 
seconds after the engine was started
does not come on at all
comes on after the engine was started 
or while driving
iFor information on infants and children 
traveling with you in the vehicle and 
restraint systems for infants and chil-
dren, see “Children in the vehicle” 
(page 72). 
     
        
        Page 85 of 506

84 Safety and SecurityDriving safety systemsIn this section you will find information on 
the following driving safety systems:
ABS (A
ntilock B
rake S
ystem)
BAS (B
rake A
ssist S
ystem)
ESP (E
lectronic S
tability P
rogram)
ABS
The Antilock Brake System (ABS) regulates 
the brake pressure so that the wheels do 
not lock during braking. This allows you to 
maintain the ability to steer your vehicle.
The ABS is functional above a speed of ap-
proximately 5 mph (8 km/h) independent 
of road surface conditions.
On slippery road surfaces, the ABS will 
respond even to light brake pressure.
The - indicator lamp in the instrument 
cluster (
page 24) comes on when you 
switch on the ignition. It goes out when the 
engine is running.
iIn winter operation, the maximum ef-
fectiveness of the ABS, the BAS, and 
the ESP is only achieved with winter 
tires (M + S tires) or snow chains as 
required.
Warning!
G
The following factors increase the risk of 
accidents:
Excessive speed, especially in turns
Wet and slippery road surfaces
Following another vehicle too closely
The ABS, BAS, and ESP cannot reduce this 
risk.
Always adjust your driving style to the 
prevailing road and weather conditions.
Warning!
G
Do not pump the brake pedal. Use firm, 
steady brake pedal pressure instead. Pump-
ing the brake pedal defeats the purpose of 
the ABS and significantly reduces braking 
effectiveness. 
     
        
        Page 87 of 506

86 Safety and SecurityDriving safety systemsFor more information, see “Practical hints” 
(page 353).
ESP
The Electronic Stability Program (ESP) is 
operational as soon as the engine is run-
ning and monitors the vehicle’s traction 
(force of adhesive friction between the 
tires and the road surface) and handling.
The ESP recognizes when a wheel is 
spinning or if the vehicle starts to skid. By 
applying brakes to the appropriate wheel 
and by limiting the engine output, the ESP 
works to stabilize the vehicle. The ESP is 
especially useful while driving off and on 
wet or slippery road surfaces. The ESP also 
stabilizes the vehicle during braking 
maneuvers.
The ESP warning lamp v in the instru-
ment cluster flashes when the ESP is 
engaged.
The warning lamp v in the instrument 
cluster comes on when you switch on the 
ignition. It goes out when the engine is 
running.
Warning!
G
The BAS cannot prevent the natural laws of 
physics from acting on the vehicle, nor can 
it increase braking efficiency beyond that 
afforded by the condition of the vehicle 
brakes and tires or the traction. The BAS 
cannot prevent accidents, including those 
resulting from excessive speed in turns, fol-
lowing another vehicle too closely, or hydro-
planing. Only a safe, attentive, and skillful 
driver can prevent accidents. The 
capabilities of a BAS equipped vehicle must 
never be exploited in a reckless or danger-
ous manner which could jeopardize the 
user’s safety or the safety of others.
Warning!
G
Never switch off the ESP when you see the 
ESP warning lamp v flashing in the in-
strument cluster. In this case, proceed as 
follows:
While driving off, apply as little throttle 
as possible.
While driving, ease upon the accelera-
tor.
Adapt your speed and driving style to 
the prevailing road conditions.
Failure to observe these guidelines could 
cause the vehicle to skid.
The ESP cannot prevent accidents resulting 
from excessive speed. 
     
        
        Page 94 of 506
93 Controls in detail
Locking and unlocking
Seats
Memory function
Lighting
Instrument cluster
Control system
Automatic transmission
Good visibility
Climate control (CLK 320)
Automatic climate control (CLK 500/CLK 55 AMG)
Audio system
Power windows
Soft top
Driving systems
Loading
Useful features 
     
        
        Page 118 of 506

117 Controls in detailSeats
Seat heating*
Both switches for the front seats are 
located in the center console.
1Seat heating switchThe red indicator lamps on the switch1 
show which heating level you have select-
ed.
Switch on the ignition (
page 34).
All the lamps in the instrument cluster 
come on.Switching on seat heating
Press seat heating switch1 twice.
Three red indicator lamps in the switch 
come on.
Continue pressing seat heating 
switch1 until desired seat heating 
level is reached.
Switching off seat heating
Press seat heating switch1 
repeatedly until all red indicator lamps 
go out.
Level3
Three indicator lamps on.
After approximately five minutes, 
seat heating is automatically 
switched to level 2.
2
Two indicator lamps on.
After approximately ten minutes, 
seat heating is automatically 
switched to level 1.
1
One indicator lamp on.
After approximately 20 minutes, 
seat heating is automatically 
switched off.
off
No indicator lamp on.
iIf one or all of the indicator lamps flash 
on the seat heating switch1, there is 
insufficient voltage due to too many 
electrical consumers being switched 
on. The seat heating switches off 
automatically.
The seat heating will switch back on 
again automatically as soon as 
sufficient voltage is available.