ECU MERCEDES-BENZ M-Class 2015 W166 Owner's Guide

Problem
Possible causes/consequences and
0050
0050Solutions 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 389).
or
X Jump-start the vehicle (Y page 391).
or
X Consult a qualified specialist workshop. The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. A door 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 shifting the automatic transmission out of
park position P
R Start 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, particu-
larly in the event of sudden braking or a sud-
den 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 load- ing guidelines (Y page 334).86
DoorsOpening and closing

Unlocking and opening doors from
the inside
You can open a door from inside the vehicle
even if it has been locked. You can only open
the rear doors from inside the vehicle if they
are not secured by the child-proof locks
(Y page 66).
If the vehicle has been locked with the Smart-
Key or with KEYLESS-GO, opening a door from the inside will trigger the anti-theft alarm sys-
tem. Switch off the alarm (Y page 77).X
Front door: pull door handle 0044.
If the door is locked, locking knob 0043pops
up. The door is unlocked and can be
opened.
X Rear door: pull up locking knob 0043on the
relevant rear door.
The rear door is unlocked and can be
opened. Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from the inside. The buttons are located on
both front doors. 0043
To unlock
0044 To lock
X To unlock: press button 0043.
X To lock: press button 0044.
If the front-passenger door is closed, the
vehicle locks.
Meanwhile, the fuel filler flap will not be
locked or unlocked.
You cannot unlock the vehicle centrally from
the inside if the vehicle has been locked with the SmartKey or KEYLESS-GO.
You can open a front door from inside the
vehicle even if it has been locked.
If the vehicle has been locked using the lock-
ing button for the central locking, or has been
locked automatically, and a door is opened
from the inside:
R the vehicle will be fully unlocked if it had
previously been fully unlocked
R only the door which has been opened form
the inside is unlocked if only the driver's
door had been previously unlocked Doors
87Opening and closing Z

X
Take the mechanical key out of the Smart-
Key (Y page 82).
X Insert the mechanical key into the lock of
the driver's door as far as it will go. X
Turn the mechanical key clockwise as far as
it will go to position 0047.
X Turn the mechanical key back and remove
it.
X Make sure that the doors and the tailgate
are locked.
X Insert the mechanical key into the Smart-
Key.
i If you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-
theft alarm system is not armed. Cargo compartment
Important safety notes
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
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning. Turn off the engine before opening the tail-
gate. Never drive with the tailgate open.
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, particu-
larly in the event of sudden braking or a sud-
den 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.
! The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and
behind the tailgate.
i Tailgate opening dimensions
(Y page 456).
You should preferably place luggage or loads
in the cargo compartment. Observe the load- ing guidelines (Y page 334).
Do not leave the SmartKey in the cargo com- partment. You could otherwise lock yourself
out.
Vehicles without the EASY-PACK tailgate:
the tailgate can be:
R opened and closed manually from outside
R unlocked from inside with the emergency
release
For vehicles with the EASY-PACK tailgate you can:
R close the tailgate manually from outside
R open and close the tailgate automatically
from outside
R open and close the tailgate automatically
from inside
R unlock the tailgate from inside with the
emergency release
R limit the opening angle of the tailgate Cargo compartment
89Opening and closing Z

we strongly recommend that children be
placed in the rear seat whenever possible.
Regardless of seating position, children 12
years old and under must be seated and prop- erly secured in an appropriately sized child
restraint system or booster seat recommen-
ded for the size and weight of the child. For
additional information, see the "Children in
the vehicle" section.
A child's risk of serious or fatal injuries is sig- nificantly increased if the child restraints are
not properly secured in the vehicle and/or thechild is not properly secured in the child
restraint.
! To avoid damage to the seats and the seat
heating, observe the following information:
R keep liquids from spilling on the seats. If
liquid is spilled on the seats, dry them as soon as possible.
R if the seat covers are damp or wet, do not
switch on the seat heating. The seat
heating should also not be used to dry
the seats.
R clean the seat covers as recommended;
see "Interior care".
R do not transport heavy loads on the
seats. Do not place sharp objects on the seat cushions, e.g. knives, nails or tools. The seats should only be occupied by
passengers, if possible.
R when the seat heating is in operation, do
not cover the seats with insulating mate-
rials, e.g. blankets, coats, bags, seat cov- ers, child seats or booster seats.
! Make sure that there are no objects in the
footwell under or behind the seats when
moving the seats back. There is a risk that
the seats and/or the objects could be dam- aged.
i It is not possible to remove the head
restraints from the front seats. The rear-
compartment head restraints, however,
can be removed (Y page 108). For more information, contact a qualified
specialist workshop.
i Further related subjects:
R Important safety notes on air bags
(Y page 50)
R Cargo compartment enlargement (fold-
ing down the rear bench seat)
(Y page 337)
R Securing children in the vehicle
(Y page 62) Adjusting the seats electrically
0043
Head restraint height
0044 Seat cushion angle
0087 Seat height
0085 Seat fore-and-aft adjustment
0083 Backrest angle
i Vehicles with memory function: if PRE-
SAFE ®
has been triggered, the front-
passenger seat will be moved to a better
position if it was previously in an unfavora- ble position.
i You can store the seat settings using the
memory function (Y page 116). Adjusting the head restraints
General notes Pay attention to the important safety notes
(Y
page 105). 106
SeatsSeats, steering wheel and mirrors

Halogen headlamps
0043
Low-beam headlamp: H7 55 W
0044 High-beam headlamp: H7 55 W
0087 Parking lamp/standing lamp: W 5 W BV
0085 Side marker lamp: WY 5 W Tail lamp
0043
Brake lamp: P 21 W-L Changing the front bulbs
Removing and installing the cover in the
front wheel housing You must remove the cover from the front
wheel housing before you can change the
front bulbs. X
To remove: switch off the lights.
X Turn the front wheels inwards.
X Remove securing pin 0044using a suitable
tool.
X Slide cover 0043up and remove it.
X To install: insert cover 0043again and slide it
down until it engages.
X Insert securing pin 0044.
Low-beam headlamps (halogen head-
lamps) X
Remove the cover in the front wheel hous-
ing (Y page 130).
X Turn housing cover 0043counter-clockwise
and pull it out.
X Turn bulb holder 0044counter-clockwise and
pull it out.
X Take the bulb out of bulb holder 0044.
X Insert the new bulb into bulb holder 0044.
X Insert bulb holder 0044into the lamp and turn
it clockwise. 130
Replacing bulbsLights and windshield wipers

Useful information
i This Operator's Manual describes all
models and all standard and optional equip- ment of your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops (Y page 29). Notes on breaking-in a new vehicle
Important safety notes
The sensor system of some driving and driv-
ing safety systems adjusts automatically
while a certain distance is being driven after
the vehicle has been delivered or after
repairs. Full system effectiveness is not
reached until the end of this teach-in proce-
dure.
New and replaced brake pads and discs only
reach their optimum braking effect after sev-
eral hundred kilometers of driving. Compen-
sate for this by applying greater force to the
brake pedal. The first 1000 miles (1500 km)
The more you look after the engine when it is
new, the more satisfied you will be with its
performance in the future.
R You should therefore drive at varying vehi-
cle and engine speeds for the first
1000 miles (1500 km).
R Avoid heavy loads, e.g. driving at full throt-
tle, during this period.
R Change gear in good time, before the tach-
ometer needle is 00C3of the way to the red
area of the tachometer. R
Do not manually shift to a lower gear to
brake the vehicle.
R Try to avoid depressing the accelerator
pedal beyond the point of resistance (kick-
down).
After 1000 miles (1500 km), you can increase
the engine speed gradually and accelerate
the vehicle to full speed.
Additional breaking-in notes for AMG vehi-
cles:
R Do not drive faster than 85 mph
(140 km/h) for the first 1,000 miles
(1,500 km).
R Only allow the engine to reach a maximum
engine speed of 4,500 rpm briefly.
R Change gear in good time.
R Ideally, for the first 1,000 miles (1,500 km),
drive in program C.
i You should also observe these notes on
breaking in if the engine or parts of the drive
train on your vehicle have been replaced.
i Always observe the respective speed lim-
its. Driving
Important safety notes
G
WARNING
Objects in the driver's footwell can restrict the pedal travel or obstruct a depressed pedal.
The operating and road safety of the vehicle is
jeopardized. There is a risk of an accident.
Make sure that all objects in the vehicle are
stowed correctly, and that they cannot enter
the driver's footwell. Install the floormats
securely and as specified in order to ensure
sufficient clearance for the pedals. Do not use loose floormats and do not place floormats on
top of one another. 156
DrivingDriving and parking

ECO start/stop function (all vehicles
except the ML 250 BlueTEC 4MATIC)
Introduction This section describes the ECO start/stop
function for all vehicles except the ML 250
BlueTEC 4MATIC. Information about the ECO
start/stop function on the ML 250 BlueTEC
4MATIC (Y page 164).
The ECO start/stop function switches the
engine off automatically if the vehicle is stop- ped under certain conditions.
The engine starts automatically when the
driver wants to pull away again. The ECO
start/stop function thereby helps you to
reduce the fuel consumption and emissions
of your vehicle.
Important safety notes G
WARNING
If the engine is switched off automatically and you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving. There is a risk of accident and injury.
If you wish to exit the vehicle, always turn off
the ignition and secure the vehicle against
rolling away.
General notes 0043
ECO start/stop display
If the 00A7 symbol is shown in green in the
multifunction display, the ECO start/stop
function switches the engine off automati-
cally if the vehicle stops moving.
Every time you switch on the engine using the SmartKey or the Start/Stop button, the ECO
start/stop function is activated. If the ECO start/stop function has been man-
ually deactivated (Y page 163) or a malfunc-
tion has caused the system to be deactivated, the 00A7 symbol is not displayed.
AMG vehicles: the ECO start/stop function
is only available in drive program C.
For further information on automatic engine
switch-off (Y page 162) and automatic
engine start (Y page 163).
Automatic engine switch-off If the vehicle is braked to a standstill in
Dor N,
the ECO start/stop function switches off the engine automatically.
The ECO start/stop function is operational
and the 00A7symbol is displayed in green in
the multifunction display, if:
R the indicator lamp in the ECO button is lit
green.
R no off-road program has been selected.
R the outside temperature is within the range
that is suitable for the system.
R the engine is at normal operating temper-
ature.
R the set temperature for the vehicle interior
has been reached.
R the battery is sufficiently charged.
R the system detects that the windshield is
not fogged up when the air-conditioning
system is switched on.
R the hood is closed.
R the driver's door is closed and the driver's
seat belt is fastened.
If conditions for automatic engine switch-off
have not been fulfilled, the 00A7symbol will
be shown in yellow.
i All of the vehicle's systems remain active
when the engine has been stopped auto-
matically.
i The HOLD function can be activated if the
engine has been switched off automati-
cally. It is then not necessary to continue
applying the brakes during the automatic 162
DrivingDriving and parking

stop phase. When you depress the accel-
erator pedal, the engine starts automati-
cally and the braking effect of the HOLD
function is deactivated.
i All vehicles (apart from AMG vehicles):
automatic engine switch-off can take place a maximum of four times consecutively (ini-
tial stop then repeated three times). The
00A7 symbol is shown in yellow in the mul-
tifunction display after the engine has been started automatically for the fourth time.
When the 00A7symbol is shown in green in
the multifunction display, automatic engine switch-off is again possible.
i AMG vehicles:
times which the engine
can be automatically switched off.
Automatic engine start The engine starts automatically if:
R you switch off the ECO start/stop function
by pressing the ECO button.
R in transmission position Dor Nthe brake
pedal is released and the HOLD function is not active.
R you depress the accelerator pedal.
R you engage reverse gear R.
R you move the transmission out of position
P.
R you switch to drive program Sor M(AMG
vehicles).
R you switch to an off-road program (except
for AMG vehicles).
R you unfasten your seat belt or open the
driver's door.
R the vehicle starts to roll.
R the brake system requires this.
R the temperature in the vehicle interior devi-
ates from the set range.
R the system detects moisture on the wind-
shield when the air-conditioning system is
switched on.
R the battery's condition of charge is too low. i
Shifting the transmission to position
P
does not start the engine.
i If you shift the transmission from
Rto D,
the ECO start/stop function is available
again once the 00A7symbol reappears in
green in the multifunction display.
Deactivating/activating the ECO start/
stop function All vehicles (except AMG vehicles)
X
To deactivate: press ECO button 0043.
Indicator lamp 0044and the 00A7ECO sym-
bol in the multifunction display go out.
X To activate: press ECO button 0043.
Indicator lamp 0044lights up. If all conditions
for automatic engine switch-off
(Y page 162) are fulfilled, the 00A7symbol
is shown in green in the multifunction dis-
play.
If not all conditions for automatic engine
switch-off (Y page 162) are fulfilled, the
00A7 symbol is shown in yellow in the mul-
tifunction display. If this is the case, the
ECO start/stop function is not available.
i If indicator lamp
0044is off, the ECO start/
stop function has been deactivated man-
ually or as the result of a malfunction. The
engine will then not be switched off auto-
matically when the vehicle stops. Driving
163Driving and parking Z

AMG vehicles
X
To switch off: in drive program C, press
ECO button 0043.
or X Switch to drive program Sor M
(Y page 172).
Indicator lamp 0044and the 00A7ECO sym-
bol in the multifunction display go out.
X To activate: press ECO button 0043.
Indicator lamp 0044lights up. If drive pro-
gram Sor Mis active, the automatic trans-
mission switches to drive program C.
If all conditions for automatic engine
switch-off (Y page 162) are fulfilled, the
00A7 symbol is shown in green in the mul-
tifunction display.
If the conditions for automatic engine
switch-off are not all fulfilled (Y page 162),
the 00A7 symbol is lit yellow. If this is the
case, the ECO start/stop function is not
available.
i If indicator lamp
0044is off, the ECO start/
stop function has been deactivated man-
ually or as the result of a malfunction. The
engine will then not be switched off auto-
matically when the vehicle stops. ECO start/stop function (ML 250
BlueTEC 4MATIC)
Introduction The ECO start/stop function switches the
engine off automatically if the vehicle is stop-
ped under certain conditions.
The engine starts automatically when the
driver wants to pull away again. The ECO
start/stop function thereby helps you to
reduce the fuel consumption and emissions
of your vehicle.
Important safety notes G
WARNING
If the engine is switched off automatically and you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving. There is a risk of accident and injury.
If you wish to exit the vehicle, always turn off
the ignition and secure the vehicle against
rolling away.
General notes 0043
ECO start/stop display
If the engine has been switched off automat-
ically by the ECO start/stop function, the
00A7 symbol is shown in the multifunction
display.
Every time you switch on the engine using the SmartKey or the Start/Stop button, the ECO
start/stop function is activated.
For further information on automatic engine
switch-off (Y page 165) and automatic
engine start (Y page 165).164
DrivingDriving and pa
rking

R
If the electric parking brake is engaged,
release it.
R Switch off the ignition and leave the Smart-
Key in the ignition lock.
Using KEYLESS-GO:
R Make sure that the ignition is switched on.
R When the vehicle is stationary, depress the
brake pedal and keep it depressed.
R Engage park position P.
R Release the brake pedal.
R Remove the Start/Stop button from the
ignition lock.
R Insert the SmartKey into the ignition lock.
R Switch on the ignition.
R Depress the brake pedal and keep it
depressed.
R Shift to neutral N.
R Release the brake pedal.
R If the electric parking brake is engaged,
release it.
R Switch off the ignition and leave the Smart-
Key in the ignition lock.
Engaging drive position D X
If the transmission is in position Ror N:
push the DIRECT SELECT lever down past
the first point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT
SELECT lever down past the first point of
resistance. Transmission positions
0045 Park position
Do not shift the transmission into
position
P(Y page 182) unless the
vehicle is stationary. The parking
lock should not be used as a brake when parking. Always apply the
electronic parking brake in addi-
tion to the parking lock in order to
secure the vehicle.
If the vehicle electronics are mal-
functioning, the transmission may
be locked in position P. Have the
vehicle electronics checked imme-
diately at a qualified specialist
workshop.
The automatic transmission shifts
to Pautomatically if you:
R remove the SmartKey
R switch off the engine when in R
or Dand open one of the front
doors 0046 Reverse gear
Only shift the transmission to
R
when the vehicle is stationary. 170
Automatic transmissionDriving and parking