Page 396 of 489

395 Practical hints
What to do if …
Left displayRight displayPossible cause/consequencePossible solution
.Tail Lamp
Right
Auxiliary Bulb OnThe right tail lamp is malfunction-
ing. An auxiliary bulb has been 
brought into use.Contact an authorized Mercedes-Benz Center 
as soon as possible.
Turn Signal
Left MirrorThe turn signal in the driver’s side 
exterior rear view mirror is malfunc-
tioning. This message will only ap-
pear if all light emitting diodes have 
stopped working.Contact an authorized Mercedes-Benz Center 
as soon as possible.
Turn Signal
Right MirrorThe turn signal in the passenger 
side exterior rear view mirror is mal-
functioning. This message will only 
appear if all light emitting diodes 
have stopped working.Contact an authorized Mercedes-Benz Center 
as soon as possible.
Lights Are
still OnYou have removed the SmartKey 
from the starter switch and opened 
the driver’s door and left the head-
lamps on or removed the SmartKey 
with KEYLESS-GO* from the vehicle 
and left the headlamps on.Turn the exterior lamp switch toM 
orU.
Turn Signal
Front Left
Auxiliary Bulb OnThe left front turn signal lamp is 
malfunctioning. An auxiliary bulb 
has been brought into use.Replace the bulb as soon as possible 
(
page 409). 
     
        
        Page 410 of 489

409 Practical hints
Replacing bulbs
Replacing bulbs
Bulbs
Safe 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 
adjustment.
Warning!G
Bulbs and bulb sockets can be very hot. 
Allow the lamp to cool down before chang-
ing a bulb.
Keep bulbs out of reach of children.
Halogen lamps contain pressurized gas. 
A bulb can explode if you:
touch or move it when hot
drop the bulb
scratch the bulb
Wear eye and hand protection.
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.
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.
iAuxiliary bulbs will be brought into use when 
the following lamps malfunction:
Turn signal lamps
Brake lamps
Parking lamps
Tail lamps
Observe the messages in the multifunction 
display (
page 359). 
     
        
        Page 412 of 489

411 Practical hints
Replacing bulbs
Notes on bulb replacement
Only use 12-volt bulbs of the same type 
and with the specified watt rating. 
Switch the lights off before changing a 
bulb to prevent short circuits. 
Always use a clean lint-free cloth when 
handling bulbs. 
Your hands should be dry and free of oil 
and grease.
If the newly installed bulb does not 
come on, visit an authorized 
Mercedes-Benz Center.Have the LEDs and bulbs for the following 
lamps replaced by an authorized 
Mercedes-Benz Center:
the additional turn signals in the 
exterior rear view mirrors
the high mounted brake lamp
the brake lamps
the parking lamps and the side marker 
lamps in the tail lamp unit
the rear fog lamps
the low beam (Xenon or Bi-Xenon*) 
lamps
the front fog lamps
the front side marker lamps
Replacing 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 
position M (
page 131).
Open the hood (page 282).
1Bulb socket for turn signal lamp
2High beam headlamp cover
3Low beam headlamp cover (Xenon or 
Bi-Xenon* lamp). Do not remove.
!Do not replace the LEDs yourself. You could 
otherwise damage the LEDs or parts of the 
vehicle. Only have the LEDs replaced by an 
authorized Mercedes-Benz Center.