Doors - Mercedes-Benz M-Class Owner's Manual

Problem
The engine cannot be
started using the key.
The engine cannot be
started using KEYLESS-
GO. The key is in the
vehicle.

Doors

Important safety notes
G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key or with KEY-
LESS-GO, the double lock function is activa-
ted as standard. It is then not possible to open
the doors from inside the vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people requiring special assistance. As
a result, they may not be able to free them-
selves in the event of an emergency. They
could be seriously or even fatally injured by
prolonged exposure to extremely high or low
temperatures, for example. In this case, res-
cuing people from outside the vehicle is diffi-
cult.
Deactivate the interior motion sensor before
you lock the vehicle. The doors can then be
opened from the inside after the vehicle has
been locked from the outside.
Possible causes/consequences and M Solutions
The on-board voltage is too low.
Switch off non-essential consumers, e.g. seat heating or interior
X
lighting, and try to start the engine again.
If this does not work:
Check the starter battery and charge it if necessary
X
( page 343).
Y
or
Jump-start the vehicle (
X
or
Consult a qualified specialist workshop.
X
A door is open. Therefore, the key cannot be detected as easily.
Close the door and try to start the vehicle again.
X
There is interference from a powerful source of radio waves.
Start your vehicle with the key in the ignition lock.
X
page 348).
Y
G WARNING
If children are left unsupervised in the vehicle,
they could:
open a door from inside the vehicle at any
R
time, even if it has been locked
start the vehicle using a key which has been
R
left in the vehicle
release the electric parking brake
R
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time.
Unlocking and opening the doors
from the inside
For all countries except the United King-
dom: you can open a door from inside the
vehicle even if it has been locked.
Only for the United Kingdom: if the vehicle
has been locked with the key or with KEY-
LESS-GO, the double lock function is activa-
ted as standard. It is then not possible to open
Doors
77
Z