Page 23 of 464
23 At a glance
Cockpit
Item
Page
1
Automatic transmission*:
Steering wheel gearshift 
control*
161
SLK 55 AMG:
Steering wheel gearshift 
control (Speedshift)
162
2
Multifunction steering 
wheel
26,
118
3
Horn
4
Instrument cluster
24,
115
5
Overhead control panel
30,
113
6
Glove box
250
7
Center console
28, 29
8
Starter switch
35
9
Steering wheel adjustment 
handle, manual
41
a
Steering wheel adjustment 
lever, electrical*
41
Heated steering wheel* 
(SLK 350, Canada only)
270
b
Headlamp cleaning* 
switch
167
c
Hood lock release
287
d
Exterior lamp switch
52,
106
e
Combination switch
Turn signals
52
Windshield wipers
53
High beam headlamps
52
f
Power window switches
232
g
Door handle
94
h
Cruise control lever
244
Item
Page 
     
        
        Page 285 of 464

285 Operation
At the gas station
Remove the SmartKey from the starter 
switch.
Open fuel filler flap by pushing at point 
indicated by arrow1.
The fuel filler flap springs open.
Turn fuel filler cap counterclockwise 
and hold on to it until possible pressure 
is released.
Take off fuel filler cap and set it in di-
rection of arrow2 in the recess on the 
inside of fuel filler flap.
To prevent fuel vapors from escaping 
into open air, fully insert filler nozzle 
unit.
Only fill your tank until the filler nozzle 
unit cuts out – do not top up or over-
fill. 
Replace the fuel filler cap by turning it 
clockwise until it engages audibly.
Close the fuel filler flap.
Check regularly and before a long tripEngine compartment (SLK 350, example)1Windshield washer system and head-
lamp cleaning system* reservoir
2Brake fluid reservoir
3Coolant expansion tank
Warning!
G
Overfilling of the fuel tank may create pres-
sure in the system which could cause a gas 
discharge. This could cause the gas to spray 
back out when removing the fuel pump noz-
zle, which could cause personal injury.iLeaving the engine running and the fuel 
cap open can cause the yellow fuel 
tank reserve warning lamp to flash and 
the ? malfunction indicator lamp 
(USA only) or the ± malfunction in-
dicator lamp (Canada only) to illumi-
nate.
For more information, see “Practical 
hints” (
page 344).
iFor opening the hood, see “Hood” 
(page 287). 
     
        
        Page 287 of 464

287 Operation
Engine compartment
Engine compartment
Hood
Opening
The hood release is located on the driver 
side under the instrument panel.
1Hood lock release lever
Pull hood lock release lever1 in direc-
tion of arrow.
The hood is unlocked.
2Lever for opening the hood
Push lever2 on the hood upward to 
release hood.
With the hood released, lift the hood by 
lifting it at the front edge.
The hood will be automatically held 
open at shoulder height by gas-filled 
struts.
Warning!
G
Do not pull the release lever while the vehi-
cle is in motion. Otherwise the hood could 
be forced open by passing air flow.
!To avoid damage to the windshield 
wipers or hood, never open the hood if 
the wiper arms are folded forward away 
from the windshield.
Warning!
G
To help prevent personal injury, stay clear of 
moving parts when the hood is open and the 
engine is running. Make sure the hood is 
properly closed before driving. When closing 
the hood, use extreme caution not to catch 
hands or fingers.
The radiator fan may continue to run for ap-
proximately 30 seconds or even restart af-
ter the engine has been turned off. Stay 
clear of fan blades.
 
     
        
        Page 338 of 464

338 OperationVehicle care
Clean the wiper blade inserts with a 
clean cloth and detergent solution.Window cleaning
Switch on wipers and place them in a 
vertical position.
For information on placing the wipers 
in a vertical position, see “Replacing 
wiper blades” (
page 386).
Use a window cleaning solution on all 
glass surfaces. 
An automotive glass cleaner is recom-
mended.
Warning!
G
For safety reasons, switch off wipers and re-
move SmartKey from starter switch before 
cleaning the wiper blades. Otherwise, the 
wiper motor could suddenly turn on and 
cause injury.!Fold the windshield wipers back onto 
the windshield before turning the 
SmartKey in the starter switch.
Hold on to the wiper when folding the 
windshield wiper back. If released, the 
force of the impact from the tensioning 
spring could crack the windshield.
!The windshield wipers must be in a ver-
tical position before folding them away 
from the windshield. They could other-
wise damage the hood.Warning!
G
For safety reasons, switch off wipers and re-
move SmartKey from starter switch before 
cleaning the wiper blade. Otherwise, the 
wiper motor could suddenly turn on and 
cause injury.
!Fold the windshield wipers back onto 
the windshield before turning the 
SmartKey in the starter switch.
Hold on to the wiper when folding the 
windshield wiper back. If released, the 
force of the impact from the tensioning 
spring could crack the windshield.!Fold the windshield wiper arms back 
onto the windshield before turning the 
SmartKey in the starter switch.
Hold onto the wiper when folding the 
wiper arm back. If released, the force 
of the impact from the tensioning 
spring could crack the windshield.
 
     
        
        Page 344 of 464

344 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
?
±
(USA only)
(Canada only)
The yellow engine 
malfunction indicator 
lamp comes on while 
driving.
There is a malfunction in:
the fuel management system
the ignition system
the emission control system
systems which affect emissions
Such malfunctions may result in ex-
cessive emissions values and may 
switch the engine to its limp-home 
(emergency operation) mode.
Have the vehicle checked as soon as possible 
by an authorized Mercedes-Benz Center.
An on-board diagnostic connector is used by 
the service station to link the vehicle to the 
shop diagnostics system. It allows the accu-
rate identification of system malfunctions 
through the readout of diagnostic trouble 
codes. It is located in the front left area of the 
footwell near the hood release.
Your fuel tank is empty.
After refueling start, turn off and restart the 
engine three or four times in succession. 
The limp-home mode is canceled. You do not 
need to have your vehicle checked.
Additionally you see 
the message 
Check 
gas cap 
See Operator’s 
Manual
 in the multi-
function display.
A loss of pressure has been detect-
ed in the fuel system. The fuel cap 
may not be closed properly or the 
fuel system may be leaking.
Check the fuel cap (
page 284).
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked by an autho-
rized Mercedes-Benz Center. 
     
        
        Page 386 of 464
386 Practical hintsReplacing wiper bladesRemoving wiper blades
Turn the SmartKey in the starter switch 
to position1.
Turn combination switch to wiper 
settingII (
page 53).
With wiper arms in vertical position, 
turn the SmartKey in the starter switch 
to position0.
Fold the wiper arms forward until they 
engage.
1Wiper blade
2Cover
3Attachment
4Tab
5Removing
Press tabs4 together and tilt wiper 
blade1 to detach tabs4 on both 
recesses of attachment3.
Wiper blade1 is released on one end.
Maintaining its tilted position, slide 
wiper blade1 out of attachment3 in 
direction of arrow5.
Warning!
G
For safety reasons, switch off wipers and 
remove the SmartKey from the starter 
switch before replacing a wiper blade. Oth-
erwise, the motor could suddenly turn on 
and cause injury.!To avoid damage to the hood, the wiper 
arms should only be folded forward 
when in the vertical position. 
     
        
        Page 387 of 464

387 Practical hints
Replacing wiper blades
Installing wiper blades
1Installing
2Tabs
3Attachment
4Guide tab
5Cover
Slide the wiper blade into 
attachment3 in direction of 
arrow1.
Make sure guide tab4 will be placed 
under cover5 when fully inserting the 
wiper blade into attachment3.
Let tabs2 latch in into both recesses 
of attachment3.
Check if the wiper blade is securely 
fastened.
Fold the wiper arm backward to rest on 
the windshield.
Make sure you hold on to the wiper arm 
when folding it back.
!Never open the hood when the wiper 
arms are folded forward.
Hold on to the wiper when folding the 
wiper arm back. If released, the force 
of the impact from the tensioning 
spring could crack the windshield.
Do not allow the wiper arms to contact 
the windshield glass without a wiper 
blade inserted.
Make sure the wiper blades are proper-
ly installed. Improperly installed wiper 
blades may cause windshield damage.
For your convenience, you should have 
this work carried out by an authorized 
Mercedes-Benz Center. 
     
        
        Page 406 of 464
406 Practical hintsFusesFuse box in engine compartment
The fuse box is located in the engine com-
partment on the driver’s side.
1Fuse box
2Clamp
3Fuse box coverOpening 
Open the hood (
page 287).
With a dry cloth, remove any moisture 
from the fuse box.
Release clamps2.
Remove fuse box cover3.Closing 
Make sure the sealing rubber is proper-
ly positioned.
Press fuse box cover3 down and se-
cure with clamps2.