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Practical hints
What to do if ...
Left display
Right display
.
Right turn signal
Mirror
Tail lamp
Left
Substitute
bulb on
Tail lamp
Right
Substitute
bulb on
Turn off
lamps
Turn signal
Rear left
Substitute
bulb on
378
Possible cause/consequence
The right turn signal in the side mir-
ror is malfunctioning. This message
will only appear if all light emitting
diodes have stopped working.
The left tail lamp is malfunctioning.
A substitute bulb has been brought
into use.
The right tail lamp is malfunction-
ing. A substitute bulb has been
brought into use.
You have removed the SmartKey
from the starter switch and opened
the driver's door or removed the
SmartKey with KEYLESS-GO* from
the vehicle and left the headlamps
on.
The left rear turn signal lamp is mal-
functioning. A substitute bulb has
been brought into use.
Possible solution
Have the LEDs replaced as soon as possible.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Turn the exterior lamp switch to M.
Replace the bulb as soon as possible.
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