Problem
Possible causes/consequences and M
MSolutions #
Check the battery using the battery check lamp and replace if necessary (→ page 79). #
Use the emer gency keyto lock or unlock (→ page 79). #
Have theke ych ecked at a qualified specialist workshop.
Yo u ha velost a key. #
Have theke y deacti vated at a qualified specialist workshop. #
If necessar y,ha ve the mechanical lock changed as well. Doors
Note
s onthe additional door lock The additional door lock is only
available for
ve hicles forth eUni ted Kingdom. &
WARNING Risk of inju ryto persons
inside theve hicle when the additional
door lock is activated
If th e additional door lock is activated, the
doors can no longer be opened from the
inside.
If th ere are persons in theve hicle, they can
no longer le aveth eve hicle, e.g. in hazardous
situations. #
Never lea vepersons unattended in the
ve hicle, particularly children, elderly
persons or persons in need of help. #
Ifth ere are persons in theve hicle, do
not activate the additional door loc k. The additional door lock is automatically activa‐
te d in thefo llowing situations:
R The vehicle is loc ked using thekey.
R The vehicle is loc ked using KEYLESS-GO.
If th eve hicle has been loc ked via Mercedes me
connect, the additional door lock is not activa‐
te d. If
th e additional door lock is activated, the doors
cann otbe opened from the inside.
% After locking you can issue a signal with the
horn.
Yo u can pr eventthe additional door lock from
being activated bydeactivating interior pr otec‐
tion before locking theve hicle (→ page104). Un
locking/opening the doors from the inside #
United Kingdom onl y:obser vethe no tes on
th e additional door lock (→ page81). Opening and closing
81
Display messages
Possible causes/consequences and M
MSolutions #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. #
Place theke y in the slot forst arting the engine with theke y (→ page 180).
 Replace key *T
hekey needs tobe replaced. #
Consult a qualified specialist workshop.
 Key not detected (white
display message) *T
hekey is cur rently und etected. #
Change the location of theke y in theve hicle. #
Ifth eke y is still not recognised, start the engine with theke y in the slot (→ page180).
Â
Change key batteries *T
hekey bat tery is dischar ged. #
Replace the battery (→ page 79).
 *T
hekey de tection function is malfunctioning. #
Change the location of theke y in theve hicle. #
Start theve hicle with theke y in the slot (→ page180). Displ
aymessa ges and warning/indicator lamps 605
Au
xilia rybattery malfunction ...............607
Blind Spot Assi stcur rently una vaila‐
ble See Owner's Manual ...................... 580
Blind Spot Assist inope rative ............... 580
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...5 83
ÂChange key bat teries .................. 605
JCheck brake fluid le vel................ 571
ï Check trailer hit chlock (white
display message) ................................ .609
hChe cktyre(s) ............................... 601
!Clean the fuel filter ...................... 591
ÁCompressor is cooling ................ 586
?Coolant Stop vehicle Switch
engine off ............................................ 591
Cruise contro l and Limiter inope ra‐
tive ...................................................... 588
Cruise control inope rative ................... 588
Cruise control off ................................ 588 Cu
rrently unavailable Camera view
re stricted ............................................. 590
Cu rrently unavailable Radar sensors
dirty .....................................................5 86
!cur rently una vailable See Own‐
er's Manual .......................................... 572
÷ currently una vailable See Own‐
er's Manual .......................................... 567
5Engine oil le vel cannot be
measured ............................................ 591
4Engine oil le velRe duce oil le vel...5 94
4 Engine oil le velSt op vehicle
Switch engine off ................................ 595
4Engine oil pressure Stop Switch
off engine ............................................ 596
Fa ult Drive at max. 80 km/h ...............583
6Fr ont left malfunction Consult
wo rkshop (Example) ............................5 75
Fr ont-passenger airbag disabled See
Owner's Manual ..................................5 77Fr
ont-passenger airbag enabled See
Owner's Manual ................................... 576
! inope rative See Owner's Man‐
ual ....................................................... 573
÷ inope rative See Owner's Man‐
ual ....................................................... .574
T inope rative See Owner's Man‐
ual ....................................................... 571
G Inoperative .................................. 579
b Intellige nt Light Sy stem inoper‐
ative ..................................................... 61 4
 Key not de tected (white dis‐
pl ay messa ge).....................................6 05
ÂKe y not de tected (red displ ay
messa ge).............................................6 04
bLeft dipped beam (Example) ........614
6 Left windowbag malfunction
Consult workshop (Example) ...............576
Limiter inoperative .............................. 589
Limiter passive .................................... 589 Index
641
