Page 594 of 705
593 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Close doors
to lock them
You wanted to lock the vehicle but not all
doors were closed.
Close doors and lock vehicle again.
Do not
forget key
This display appears (for a maximum of
60 seconds) if the driver’s door is opened
with the engine shut off and no SmartKey in
the starter switch.
This message is only a reminder.
Insert SmartKey in the starter switch.
or
Take the SmartKey with KEYLESS-GO* with
you when leaving the vehicle.
Please
remove key
You have forgotten to remove the
SmartKey.
Remove the SmartKey from the starter
switch.
Change
key batteries
The batteries in the SmartKey with
KEYLESS-GO* are discharged.
Replace the batteries (
page 619).
Key
still in vehicle
A SmartKey with KEYLESS-GO* left in the
vehicle was recognized while locking the ve-
hicle from the outside.
Take the SmartKey with KEYLESS-GO* out of
the vehicle.
Page 595 of 705
594 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Key
not recognized
The SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.
Change the position of the SmartKey in the
vehicle.
If necessary, operate vehicle using SmartKey
with KEYLESS-GO* in starter switch under
KEYLESS-GO* button (
page 316).
Key being
initialized…
Please wait
The SmartKey with KEYLESS-GO* is being
initialized in the vehicle.
Wait until the message disappears from the
multifunction display.
Remove starting
button, then
insert key
The KEYLESS-GO* system is malfunction-
ing.
Remove KEYLESS-GO* button from over
starter switch (
page 316).
Operate the vehicle with the SmartKey in the
starter switch.
Replace key
The SmartKey with KEYLESS-GO* must be
replaced.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Page 596 of 705
595 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Third brake lamp
The high mounted brake lamp is malfunc-
tioning. This message will only appear if all
light emitting diodes have stopped working.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Corner. lamp,
Left
The left-hand corner-illuminating lamp is
malfunctioning.
Replace the bulb as soon as possible
(page 621).
Corner. lamp,
Right
The right-hand corner-illuminating lamp is
malfunctioning.
Replace the bulb as soon as possible
(page 621).
Low beam,
Left
The left low beam lamp is malfunctioning.
Bi-Xenon headlamp:
Visit an authorized Mercedes-Benz Center as
soon as possible.
Page 598 of 705

597 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Turn signal,
Left mirror
The turn signal in the left exterior rear view
mirror is malfunctioning. This message will
only appear if all light emitting diodes have
stopped working.
Have the LEDs replaced as soon as possible.
Turn signal,
Right mirror
The turn signal in the right exterior rear view
mirror is malfunctioning. This message will
only appear if all light emitting diodes have
stopped working.
Have the LEDs replaced as soon as possible.
Turn signal,
Front Left
The left front turn signal lamp is malfunc-
tioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Turn signal,
Front Right
The right front turn signal lamp is malfunc-
tioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
High beam, Left
The left high beam lamp is malfunctioning.
Replace the bulb as soon as possible
(page 621).
High beam, Right
The right high beam lamp is malfunctioning.
Replace the bulb as soon as possible
(page 621).
License plate lamp,
Left
The left license plate lamp is malfunction-
ing.
Visit an authorized Mercedes-Benz Center as
soon as possible.
License plate lamp,
Right
The right license plate lamp is malfunction-
ing.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Page 599 of 705

598 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Please
switch off lights
You are getting out of the vehicle and the
lights are still switched on.
Turn the exterior lamp switch to M
(page 342).
Switch off lights
or
remove key
The light switch is set to * and you have
forgotten to take out the SmartKey. The
parking lamps remain switched on.
Turn the exterior lamp switch to M
(page 342).
Remove the SmartKey from the starter
switch.
Front foglamp,
Left
The left front fog lamp is malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Front foglamp,
Right
The right front fog lamp is malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Rear foglamp,
Left
The left rear fog lamp is malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Rear foglamp,
Left
Substitute bulb on
The left rear fog lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Rear foglamp,
Right
The right rear fog lamp is malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Rear foglamp,
Right
Substitute bulb on
The right rear fog lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Page 602 of 705
601 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Night View Assist
inoperative
Night View Assist* is malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Night View Assist
currently unavailable
The temperature of the camera* is too high
(page 420).
Wait until the message “Night View Assist
available again” appears.
In addition you can:
Swing the camera* cover down
(page 539).
Adjust the air distribution of the automatic
climate control so that air flows upward
(page 230).
Night View Assist
Lights must be on
or set to AUTO
You have tried to switch on Night View As-
sist*, but the light switch is not set to *
or B.
Turn the exterior lamp switch to * or
B (
page 342).
Night View Assist
Not in Reverse gear
You have tried to switch on Night View As-
sist* while the automatic transmission was
in position R.
Shift the automatic transmission to P, N or D
(page 367).
Page 603 of 705
602 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Night View Assist
Lights ON or AUTO,
not in R gear
You have tried to switch on Night View As-
sist* but the light switch is not set to *
or B.
In addition, the automatic transmission is in
positionR.
Turn the exterior lamp switch to * or
B (
page 342).
Shift the automatic transmission to P, N or D
(page 367).
Night View Assist
only when
it is dark
You have tried to switch on Night View As-
sist* by daylight.
You can only switch on Night View Assist* when
it is dark.
Engine oil level
Stop vehicle!
Switch engine off
S 600 only:
There is no oil in the engine. There is a dan-
ger of engine damage.
Carefully bring the vehicle to a halt as soon
as it is safe to do so in a safe location.
Turn off the engine.
Add engine oil (
page 494) and check the
engine oil level (page 494).
Page 604 of 705
603 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
USA only:
Add 1.0 qts. engine oil
at next refueling
Canada only:
Add 1.0 l engine oil
at next refueling
S 600 only:
The engine oil level is too low.
Check the engine oil level (
page 494) and
add engine oil as required (page 494).
If you must add engine oil frequently, have
the engine checked for possible leaks.
Check engine oil level
at next refueling
S 550 only:
The engine oil level has dropped to approx-
imately the minimum level.
Check the engine oil level (
page 495) and
add engine oil as required (page 494).
If you must add engine oil frequently, have
the engine checked for possible leaks.