Page 147 of 399

144 Exterior lamp switch
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Headlamp mode 
Manual headlamp mode
The low beam headlamps and parking lamps can be 
switched on and off with the exterior lamp switch. For 
exterior lamp switch, see above.
Note:
With the daytime running lamp mode activated and the 
engine running, the low beam headlamps cannot be 
switched off manually.Automatic headlamp mode
Turn exterior lamp switch to positionU.
•Electronic key in starter switch position 1:
The parking lamps switch on and off automatically 
depending on the brightness of the ambient light.
•Electronic key in starter switch position 2 and the 
engine running:
The low beam headlamps and parking lamps are 
switched on and off automatically depending on the 
brightness of the ambient light.
The low beam headlamps and parking lamps can 
still be switched on and off manually using the 
exterior lamp switch.
Note:
With the daytime running lamp mode activated, the low 
beam headlamps cannot be switched off manually.
The headlamps will not be automatically switched on 
under foggy conditions.
Front fog lamps and rear fog lamp cannot be switched 
on manually with exterior lamp switch in positionU. 
To activate the fog lamps turn exterior switch to 
positionB.
Wa r n i n g !
The driver is responsible for the operation of the 
vehicle’s lights at all times. The automatic 
headlamp feature is only an aid to the driver. 
Switch on the vehicle lights by hand when driving 
or traffic conditions require you to do so. 
     
        
        Page 149 of 399

146 Exterior lamp switch
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Night security illumination
At low ambient light conditions and with the engine 
having been switched off, the exterior lamps (fog lamps 
and parking lamps) switch on for added illumination, 
(except in daytime running mode). After the last door 
has been closed the lamp-on time period commences.
See the individual setting menu  “LIGHTING” –
“HEADLAMPS DELAYED SWITCH–OFF” on page 128, 
for instructions on how to activate the function.
The lamp-on time period for night security illumination 
can be set at several different timed levels from 0 (off) to 
60 seconds, see the individual setting menu 
“LIGHTING” – “HEADLAMPS DELAYED SWITCH–OFF” 
on page 128.Notes:
Within 10 minutes after closing the last door the night 
security illumination can be reactivated by opening a 
door.
If after switching the engine off, no doors are opened or 
if after opening the doors they are not closed, the night 
security illumination will switch off automatically 
after 60 seconds.
Deactivating night security illumination temporarily:
Turn the electronic key in starter switch to position 0 
then to position 2 and back to position 0 again before 
getting out of the vehicle. The night security 
illumination will not be activated when the door is 
opened. 
     
        
        Page 150 of 399
147 Exterior lamp switch
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Locator lighting
After unlocking the vehicle with the electronic key 
during darkness the fog lamps and parking lamps 
switch on for approximately 40 seconds.
The exterior lamps will be switched off when opening 
the driver’s door.
See the individual setting menu “LIGHTING” –  
“LOCATOR LIGHTING” on page 128, for instructions on 
how to activate the function. Headlamp cleaning system (optional)
Turn the electronic key in starter switch to position 2.
The headlamps will be cleaned with a high-pressure 
water jet when you press the headlamp washer 
button (1).
See page 320 for instructions on filling up the 
windshield/headlamp washer reservoir. 
P82.10-2780-26 
     
        
        Page 303 of 399
300 Malfunction and warning messages
Te ch n i c a l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care Index
LIGHTING SYSTEM
Line 1 Line 2 C*
LOW BEAM,L CHECK LAMP! 2
LOW BEAM,R CHECK LAMP! 2
DISPLAY DEFECTIVE VISIT WORKSHOP!
1
2
TURN SIGNAL, L CHECK LAMP! 2
TURN SIGNAL, R CHECK LAMP! 2
L. TURN SIG. RFLECTR CHECK LAMP! 2
R. TURN SIG. RFLECTR CHECK LAMP! 2
TURN SIGNAL F, L CHECK LAMP! 2
TURN SIGNAL F, R CHECK LAMP! 2
BRAKE LIGHT
2
VISIT WORKSHOP! 2
BRAKE LIGHT, L
3
CHECK LAMP! 2
BRAKE LIGHT, R
3
CHECK LAMP! 2
3RD STOP LAMP
3
CHECK LAMP! 2
HIGH BEAM, L CHECK LAMP! 2
HIGH BEAM, R CHECK LAMP! 2
LICENSE PLATE L, L CHECK LAMP! 2
LICENSE PLATE L, R CHECK LAMP! 2
LIGHTS SWITCH OFF LIGHTS! 1
AUTOM. LIGHT ON REMOVE KEY! 1
FRONT FOGLAMP, L CHECK LAMP! 2
FRONT FOGLAMP, R CHECK LAMP! 2
REAR FOGLAMP CHECK LAMP! 2 Line 1 Line 2 C* 
     
        
        Page 304 of 399

301 Malfunction and warning messages
Te ch n i c a l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care IndexIn the case of bulb failures in certain lamps, other lamps 
will substitute. See page 345 for instructions on 
replacing bulbs.
* C = Category, see page 290
1 The display or the system is malfunctioning.
2 The brake lamps are switching on after a delay or are permanently 
on – visit workshop immediately.
3 The brake lamp comprises several light emitting diodes. The 
warning message will only appear if all light emitting diodes have 
stopped working.
4 Other bulbs will be brought into use as replacements when certain 
lamps blow. REAR FOGLAMP SWITCH OFF
SUBSTITUTE LAMP ON!
4
2
REVERSE LIGHT, L CHECK LAMP! 2
REVERSE LIGHT, R CHECK LAMP! 2
TAIL LIGHT, L CHECK LAMP!
SUBSTITUTE LAMP ON!
4
2
TAIL LIGHT, R CHECK LAMP!
SUBSTITUTE LAMP ON!
4
2
SIDELIGHT, L CHECK LAMP!
SUBSTITUTE LAMP ON!
4
2
SIDELIGHT, R CHECK LAMP!
SUBSTITUTE LAMP ON!
4
2 Line 1 Line 2 C*