2014 MERCEDES-BENZ M-Class key battery

X
Repeatedly tap the SmartKey against your
palm until battery 0023falls out.
X Inser tthe new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so.
X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X Insert the front tabs of battery
compartment cover 0002into the housing
first and then press to close it.
X Insert mechanical key 0003into the
SmartKey.
X Check the function of all SmartKey buttons
on the vehicle. 84
SmartKeyOpening and closing

Problems with the SmartKey
Problem Possible causes/consequences and
0001 Solutions
You cannot lock or
unlock the vehicle
using the SmartKey. The SmartKey battery is discharged or nearly discharged.
X
Try again to lock/unlock the vehicle using the remote control
function of the SmartKey. Point the tip of the SmartKey at the
driver's door handle from close range and press the 000Cor
000B button.
If this does not work:
X Check the SmartKey battery (Y page 83) and replace it if
necessary (Y page 83).
X Lock (Y page 88) or unlock (Y page 88) the vehicle using
the mechanical key. The SmartKey is faulty.
X
Lock (Y page 88) or unlock (Y page 88) the vehicle using
the mechanical key.
X Have the SmartKey checked at a qualified specialist workshop. You can no longer lock
or unlock the vehicle
using KEYLESS-GO. There is interference from a powerful source of radio waves.
X Lock/unlock the vehicle using the remote control function of
the SmartKey. Point the tip of the SmartKey at the driver's door
handle from close range and press the 000Cor000B button. There is a malfunction with KEYLESS-GO.
X Lock/unlock the vehicle using the remote control function of
the SmartKey. Point the tip of the SmartKey at the driver's door
handle from close range and press the 000Cor000B button.
X Have KEYLESS-GO checked at a qualified specialist workshop.
If this does not work:
X Check the SmartKey battery (Y page 83) and replace it if
necessary (Y page 83).
X Lock (Y page 88) or unlock (Y page 88) the vehicle using
the mechanical key. You have lost a
SmartKey. X
Have the SmartKey deactivated at a qualified specialist
workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. SmartKey
85Opening and closing Z

Problem Possible causes/consequences and
0001 Solutions
The engine cannot be
started using the
SmartKey. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 388).
or
X Jump-start the vehicle (Y page 389).
or
X Consult a qualified specialist workshop. The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. Ad
oor is open. Therefore, the SmartKey cannot be detected as
easily.
X Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves.
X
Start your vehicle with the SmartKey in the ignition lock. Doors
Important safety notes
G
WARNING
If children are left unsupervised in the vehicle,
they could:
R open the doors, thus endangering other
people or road users.
R get out and disrupt traffic.
R operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
R release the parking brake.
R shift the automatic transmission out of
parking position P.
R starting the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children. G
WARNING
If persons, particularly children are subjected
to prolonged exposure to extreme heat or
cold, there is a risk of injury, possibly even
fatal. Never leave children unattended in the
vehicle. G
WARNING
If objects, luggage or loads are not secured or
not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury,
particularly in the event of sudden braking or
a sudden change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
You should preferably place luggage or loads
in the cargo compartment. Observe the
loading guidelines (Y page 332).86
DoorsOpening and closing

0023
To lower the backrest contour
0022 To harden the backrest contour
You can adjust the contour of the front seat
backrests individually to provide optimum
support for your back. Switching the seat heating on/off
Activating/deactivating G
WARNING
Repeatedly switching on the seat heating can
cause the seat cushion and backrest pads to
become very hot. The health of persons with
limited temperature sensitivity or a limited
ability to react to excessively high
temperatures may be affected or they may
even suffer burn-like injuries. There is a risk
of injury.
Therefore, do not switch the seat heating on
repeatedly. Driver's and front-passenger seat
Rear seats The three red indicator lamps in the button
indicate the heating level you have selected.
The system automatically switches down
from level
3to level 2after approximately
eight minutes.
The system automatically switches down
from level 2to level 1after approximately ten
minutes.
The system automatically switches off
approximately 35 minutes after it is set to
level 1.
X Make sure that the SmartKey is in position
1or 2in the ignition lock.
X To switch on: press button0002repeatedly
until the desired heating level is set.
X To switch off: press button0002repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
heating may switch off. Seats
109Seats, steering wheel and mirrors Z

Problems with the seat heating
Problem Possible causes/consequences and
0001 Solutions
The seat heating has
switched off
prematurely or cannot
be switched on. The on-board voltage is too low because too many electrical
consumers are switched on.
X
Switch off electrical consumers that you do not need, such as
the rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat heating will
switch back on automatically. Switching the seat ventilation on/off
Activating/deactivating The three blue indicator lamps in the buttons
indicate the ventilation level you have
selected.
X
Make sure that the SmartKey is in position
2in the ignition lock.
X To switch on: press button0002repeatedly
until the desired ventilation level is set.
X To switch off: press button0002repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
ventilation may switch off.
i You can open the side windows and the
sliding sunroof using the "Convenience
opening" feature (Y page 95). The seat
ventilation of the driver's seat
automatically switches to the highest level. 110
SeatsSeats, steering wheel and mirrors

Problems with the seat ventilation
Problem Possible causes/consequences and
0001 Solutions
The seat ventilation has
switched off
prematurely or cannot
be switched on. The on-board voltage is too low because too many electrical
consumers are switched on.
X
Switch off electrical consumers that you do not need, such as
the rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat ventilation will
switch back on automatically. Steering wheel
Important safety notes
G
WARNING
You could lose control of your vehicle if you
do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint,
steering wheel and mirror and fasten your
seat belt before starting the engine. G
WARNING
Children could injure themselves if they
adjust the steering wheel. There is a risk of
injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle. Adjusting the steering wheel
manually
G
WARNING
If the steering wheel is unlocked while the
vehicle is in motion, it could change position
unexpectedly. This could cause you to lose
control of the vehicle. There is a risk of an
accident. Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.
0002
Release lever
0003 To adjust the steering wheel height
0023 To adjust the steering wheel position
(fore-and-aft adjustment)
X Push release lever 0002down completely.
The steering column is unlocked.
X Adjust the steering wheel to the desired
position.
X Push release lever 0002up completely.
The steering column is locked.
X Check if the steering column is locked.
When doing so, try to push the steering
wheel up or down or try to move it in the
fore-and-aft direction. Steering wheel
111Seats, steering wheel and mirrors Z

Folding the exterior mirrors in or out
electrically X
Make sure that the SmartKey is in position
1 or 2in the ignition lock.
X Briefly press button 0002.
Both exterior mirrors fold in or out.
i Make sure that the exterior mirrors are
always folded out fully while driving .They
could otherwise vibrate.
i If you are driving faster than
30 mph (47 km/h), you can no longer fold
in the exterior mirrors.
Setting the exterior mirrors If the battery has been disconnected or
completely discharged, the exterior mirrors
must be reset. The exterior mirrors will
otherwise not fold in when you select the
"Fold in mirrors when locking" function in the
on-board computer (Y page 277).
X Make sure that the SmartKey is in
position 1in the ignition lock.
X Briefly press button 0002.
Folding the exterior mirrors in or out
automatically If the "Fold in mirrors when locking" function
is activated in the on-board computer:
(Y page 277) R
the exterior mirrors fold in automatically as
soon as you lock the vehicle from the
outside.
R the exterior mirrors fold out again
automatically as soon as you unlock the
vehicle and then open the driver's or front-
passenger door.
Exterior mirror pushed out of position If an exterior mirror has been pushed out of
position, proceed as follows:
X
Vehicles without electrically folding
exterior mirrors: move the exterior mirror
into the correct position manually.
X Vehicles with electrically folding
exterior mirrors: press and hold button for
folding the mirrors 0002(Ypage 115) until you
hear a click and then the mirror engage in
position.
The mirror housing is engaged again and
you can adjust the exterior mirrors as usual
(Y page 114). Automatic anti-glare mirrors
The rear-view mirror and the exterior mirror
on the driver's side automatically go into anti-
glare mode if the following conditions are met
simultaneously:
R the ignition is switched on and
R incident light from headlamps strikes the
sensor in the rear-view mirror.
i The mirrors do not go into anti-glare mode
if reverse gear is engaged or if the interior
lighting is switched on. Mirrors
115Seats, steering wheel and mirrors Z

00050011
Left-hand standing lamps
00060013 Right-hand standing lamps
00070016 Parking lamps, license plate and
instrument cluster lighting
000C0006 Automatic headlamp mode,
controlled by the lights ensor
000D000D Low-beam/high-beam headlamps
00210010 Rear fog lamp
Even if the light sensor does not detec tthat
it is dark, the parking lamps and low-beam
headlamps switch on when the ignition is
switched on and the light switch is set to the
000D position. This is a particularly useful
function in the event of rain and fog.
X To switch on the low-beam headlamps:
turn the SmartKey in the ignition lock to
position 2or start the engine.
X Turn the light switch to 000D.
The green 000Dindicator lamp in the
instrumentc luster lights up.
Rear fog lamp 00050011
Left-hand standing lamps
00060013 Right-hand standing lamps 00070016
Parking lamps, license plate and
instrumen tcluste rlighting
000C0006 Automatic headlamp mode,
controlled by the light sensor
000D000D Low-beam/high-beam headlamps
00210010 Rear fog lamp
The rear fog lamp improves visibility of your
vehicle for the traffic behind in the event of
thick fog. Please take note of the country-
specific regulations for the use of rear fog
lamps.
X To switch on the rea rfog lamps: turn the
SmartKey in the ignition lock to position 2
or start the engine.
X Turn the light switch to 000Dor0006.
X Press the 0010button.
The yellow 0010indicator lamp in the
instrumen tcluster lights up.
X To switch off th erear fog lamp: press the
0010 button.
The yellow 0010indicator lamp in the
instrumen tcluster goes out.
Parking lamps
! If the battery has been excessively
discharged, the parking lamps or standing
lamps are automatically switched off to
enable the nex tengine start. Always park
your vehicle safely and sufficiently lit
according to legal standards .Avoid the
continuous use of the 0016parking lamps
for several hours .Ifpossible, switch on the
0013 right or the 0011left standing lamp. 122
Exterior lightingLights and windshiel
dwipers