Page 127 of 506

126 Controls in detailLightingCombination switch
The combination switch is located on the 
left of the steering column.Combination switch1High beam
2High beam flasherHigh beam
Turn the exterior lamp switch to 
positionB orU (
page 122).
Push the combination switch in 
direction of arrow1 to switch on the 
high beam.
The high beam headlamp indicator 
lampA in the instrument cluster 
comes on (
page 24).
Pull the combination switch in direction 
of arrow2 to its original position to 
switch off the high beam.
The high beam headlamp indicator 
lampA in the instrument cluster 
goes out.
High beam flasher
Pull the combination switch briefly in 
direction of arrow2.Cornering fog lamps* (CLK 320 with 
Bi-Xenon* headlamps)
The cornering fog lamps improve illumina-
tion of the road into which you are turning.
Cornering fog lamps will operate with the 
engine running and with
the exterior lamp switch in 
positionB (
page 122)
or
the exterior lamp switch in 
positionU (
page 122)
or
the daytime running lamp mode 
activated (
page 124)
iCornering fog lamps will only come on 
in low ambient lighting conditions.
The cornering fog lamps function is not 
available at a vehicle speed above 
25 mph (40 km/h). 
     
        
        Page 365 of 506
364 Practical hintsWhat to do if …?
On the pages that follow, you will find a 
compilation of the most important warning 
and malfunction messages that may 
appear in the display.
For your convenience the messages are 
divided into two sections:
Text messages (
page 365)
Symbol messages (
page 374)
iSwitching on the ignition causes all 
instrument cluster lamps (except low 
beam headlamp indicator lamp, high 
beam headlamp indicator lamp, and 
turn signal indicator lamps unless 
activated) as well as the multifunction 
display to come on. Make sure the 
lamps and the multifunction display are 
in working order before starting your 
journey. 
     
        
        Page 385 of 506

384 Practical hintsWhat to do if …?Display symbol
Display message
Possible cause
Possible solution
. 
High beam, left
The left high beam lamp is malfunction-
ing.
Replace the bulb as soon as possible.
High beam, right
The right high beam lamp is malfunction-
ing.
Replace the bulb as soon as possible.
Lamp sensor
Drive to workshop
The lamp sensor is malfunctioning. The 
headlamps switch on automatically.
In the control system, set lamp opera-
tion to manual (
page 152).
Switch on headlamps using the exteri-
or lamp switch.
Visit an authorized Mercedes-Benz 
Center as soon as possible.
License plate lamp,
left
The left license plate lamp is malfunction-
ing.
Replace the bulb as soon as possible.
License plate lamp,
right
 
The right license plate lamp is malfunc-
tioning.
Replace the bulb as soon as possible.
Low beam, left
The left low beam lamp is malfunctioning.
Halogen headlamp:
Replace the bulb as soon as possible.
Bi-Xenon* headlamp:
Visit an authorized Mercedes-Benz 
Center as soon as possible. 
     
        
        Page 415 of 506

414 Practical hintsReplacing bulbsSafe vehicle operation depends on proper 
exterior lighting and signaling. It is there-
fore essential that all bulbs and lamp 
assemblies are in good working order at all 
times.
Correct headlamp adjustment is extremely 
important. Have headlamps checked and 
readjusted at regular intervals and when a 
bulb has been replaced. See an authorized 
Mercedes-Benz Center for headlamp ad-
justment.
Bulbs Front lamps
iIf the headlamps or front fog lamps are 
fogged up on the inside as a result of 
high humidity, driving the vehicle a 
distance with the lights on should clear 
up the fogging.iBack-up bulbs will be brought into use 
when lamps malfunction. Observe the 
messages in the multifunction display 
(page 383).
Lamp
Type
1
Additional turn signal 
lamp
LED
2
Turn signal lamp
1156 NA
3
Halogen headlamp:
Low beam
Bi-Xenon* headlamp:
Low and high beam
1
1Vehicles with Bi-Xenon headlamps* do not replace
the Bi-Xenon bulbs yourself.
H7 (55 W) 
D2S-35 W
4
Halogen headlamp:
High beam/high beam 
flasher
Bi-Xenon* headlamp:
High beam flasher
H7 (55 W)
H7 (55 W)
Parking and standing 
lamp
W 5 W
5
Front fog lamp
Front fog lamp with 
cornering fog lamp*
HB4 (51 W)
H7 (55 W)
6
Side marker lamp
W 5 W 
     
        
        Page 417 of 506
416 Practical hintsReplacing bulbsReplacing bulbs for front lamps 
Before you start to replace a bulb for a 
front lamp, do the following first:
Turn the exterior lamp switch to 
positionM (
page 122).
Open the hood (
page 305) (except 
for side marker lamps).
Front lamps halogen-type
1Housing cover for low beam headlamp
2Housing cover for high beam head-
lamp, parking and standing lamp3Bulb socket for turn signal lamp bulb
4Bulb holder of low beam bulb
5Bulb holder of high beam bulb
6Bulb socket for parking and standing 
lamp bulbLow beam bulb
Turn housing cover1 counterclock-
wise and remove it.
Turn bulb holder4 with the bulb coun-
terclockwise and remove it.
Pull the bulb at its socket out of bulb 
holder4.
Insert the new bulb so that its socket 
locates in the recess of bulb holder4 
and is level to it.
Reinsert bulb holder4 with the bulb in 
the lamp and turn clockwise.
Align housing cover1 and turn it 
clockwise. 
     
        
        Page 418 of 506

417 Practical hints
Replacing bulbs
High beam bulb
Turn housing cover2 counterclock-
wise and remove it.
Turn bulb holder5 with the bulb coun-
terclockwise and remove it.
Pull the bulb at its socket out of bulb 
holder5.
Insert the new bulb so that its socket 
locates in the recess of bulb holder5 
and is level to it.
Reinsert bulb holder5 with the bulb in 
the lamp and turn clockwise.
Align housing cover2 and turn it 
clockwise.Front turn signal lamp bulb
Turn bulb socket3 counterclockwise 
and remove it.
Press gently onto the bulb and turn 
counterclockwise out of bulb 
socket3.
Press the new bulb gently into bulb 
socket3 and turn clockwise until it 
engages.
Place bulb socket3 back into the 
lamp and turn it clockwise.Parking and standing lamp bulb
Turn housing cover2 counterclock-
wise and remove it.
Pull out bulb socket6 with the bulb.
Pull the bulb out of the bulb socket6.
Press the new bulb into bulb socket6.
Press bulb socket6 back into the 
lamp.
Align housing cover2 and turn it 
clockwise. 
     
        
        Page 419 of 506
418 Practical hintsReplacing bulbsFront lamps Bi-Xenon*-type
1Bulb socket for turn signal lamp
2Housing cover for high beam flasher, 
parking and standing lamp
3Housing cover for Bi-Xenon* headlamp4Bulb holder for high beam flasher bulb
5Bulb socket for parking and standing 
lamp bulbHigh beam bulb for high beam flasher
Turn housing cover2 counterclock-
wise and remove it.
Turn bulb holder4 with the bulb coun-
terclockwise and remove it.
Pull the bulb at its socket out of bulb 
holder4.
Insert the new bulb so that its socket 
locates in the recess of bulb holder4 
and is level to it.
Reinsert bulb holder4 with the bulb in 
the lamp and turn clockwise.
Align housing cover2 and turn it 
clockwise.
Warning!
G
Do not remove the cover 
3
 for the Bi-Xe-
non* headlamp. Because of high voltage in 
xenon lamps, it is dangerous to replace the 
bulb or repair the lamp and its components. 
We recommend that you have such work 
done by a qualified technician. 
     
        
        Page 462 of 506

461 Technical terms
ABS
(A
ntilock B
rake S
ystem)
Prevents the wheels from locking up 
during braking so that the vehicle can 
continue to be steered.
Accessory weight
(
page 335)
Air pressure
(page 335)
Alignment bolt
Metal pin with thread. The centering 
pin is an aid used when changing a tire 
to align the wheel with the wheel hub.
Aspect ratio
(page 335)
Bar
(page 336)
BAS
(Brake A
ssist S
ystem)
System for potentially reducing braking 
distances in emergency braking situa-
tions. The system is activated when it 
senses an emergency based on how 
fast the brake is applied.Bead
(
page 336)
Bi-Xenon headlamps*
Headlamps which use an electric arc as 
the light source and produce a more in-
tense light than filament headlamps. 
Bi-Xenon headlamps produce low 
beam and high beam.
CAC
(Customer A
ssistance C
enter)
Mercedes-Benz customer service cen-
ter, which can help you with any ques-
tions about your vehicle and provide 
assistance in the event of a break-
down.
CAN system
(C
ontroller A
rea N
etwork)
Data bus network serving to control ve-
hicle functions such as door locking or 
windshield wiping.Cockpit
All instruments, switches, buttons and 
indicator/warning lamps in the passen-
ger compartment needed for vehicle 
operation and monitoring.
Cold tire inflation pressure
(
page 336)
COMAND
(Cockpit M
anagement and D
ata Sys-
tem)
Information and operating center for 
vehicle sound and communications 
systems, including the radio and the 
navigation system, as well as other op-
tional equipment (CD changer*, tele-
phone, etc.).
Control system
The control system is used to call up 
vehicle information and to change 
component settings. Information and 
messages appear in the multifunction 
display. The driver uses the buttons on 
the multifunction steering wheel to 
navigate through the system and to ad-
just settings.