2015 MERCEDES-BENZ B-Class ELECTRIC ECU

Problem
Possible causes/consequences and
M
MSolutions You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist work-
shop.
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. 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 transmission out of park position P
R start the vehicle's drive system.
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.
You should preferably place luggage or loads
in the cargo compartment. Observe the load- ing guidelines (Y page 240). Unlocking and opening doors from
the inside
X
To unlock and open a front door: pull
door handle ;.
If the door is locked, locking knob :pops
up. The door is unlocked and opens.
X To unlock a rear door: pull up locking
knob :.
The door is unlocked and can be opened.
X To open a rear door: pull door handle;.
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 62).
If the vehicle has previously been locked with
the SmartKey from the outside, opening a
door from the inside will trigger the anti-theft alarm system. Switch off the alarm
(Y page 69). Doors
79Opening and closing Z

Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from the inside. This can be useful if you wish to lock the vehicle before pulling away, for
example. X
To unlock: press button :.
X To lock: press button ;.
If all the doors and the tailgate are closed,
the vehicle locks.
This does not lock or unlock the charge
socket flap.
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 door from inside the vehicle
even if it has been locked. You can open the
rear doors from inside the vehicle unless they
are secured by the child-proof lock
(Y page 62).
If the vehicle has previously been locked with
the SmartKey from the outside, opening a
door from the inside will trigger the anti-theft alarm system. Switch off the alarm
(Y page 69).
If a locked door is opened from the inside, the previous unlock status of the vehicle will be
taken into consideration if:
R the vehicle was locked using the locking
button for the central locking, or
R if the vehicle was locked automatically
The vehicle will be fully unlocked if it had pre- viously been fully unlocked. If only the driver's
door had been previously unlocked, only the door which has been opened from the inside
is unlocked. Automatic locking feature
X
To deactivate: press and hold button :
for about five seconds until a tone sounds.
X To activate: press and hold button ;for
about five seconds until a tone sounds.
i If you press one of the two buttons and do
not hear a tone, the relevant setting has
already been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are
turning.
You could therefore lock yourself out if:
R the vehicle is being pushed.
R the vehicle is being towed.
R the vehicle is on a roller dynamometer.
You can also switch the automatic locking
function on and off using the on-board com-
puter (Y page 198). Unlocking the driver's door (mechan-
ical key)
If the vehicle can no longer be locked or
unlocked with the SmartKey or KEYLESS-GO, use the mechanical key.
If you use the mechanical key to unlock and
open the driver's door, the anti-theft alarm
system will be triggered (Y page 69).80
DoorsOpening and closing

X
Take the mechanical key out of the Smart-
Key (Y page 74).
X Insert the mechanical key into the lock of
the driver's door as far as it will go. X
Turn the mechanical key counter-clockwise
as far as it will go to position 1.
The door is unlocked.
X Turn the mechanical key back and remove
it.
X Insert mechanical key into the SmartKey
(Y page 75). Locking the vehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey or KEYLESS-GO, use the mechani-
cal key.
X Open the driver's door.
X Close the front-passenger door, the rear
doors and the tailgate.
X Press the locking button on the driver’s
door (Y page 80).
X Check whether the locking knobs on the
front-passenger door and the rear doors
are still visible. Press down the locking
knobs by hand, if necessary.
X Close the driver's door.
X Take the mechanical key out of the Smart-
Key (Y page 74).
X Insert the mechanical key into the lock of
the driver's door as far as it will go. X
Turn the emergency key element clockwise
as far as it will go to position 1.
X Turn the mechanical key back and remove
it.
X Make sure that the doors and the tailgate
are locked.
X Insert mechanical key into the SmartKey
(Y page 75).
i If you lock the vehicle as described above,
the charge socket flap is not locked. The
anti-theft alarm system is not armed. Cargo compartment
Important safety notes
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. Cargo compartment
81Opening and closing
Z

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 The opening dimensions of the tailgate
can be found in the "Vehicle data" section
(Y page 334).
You should preferably place luggage or loads in the cargo compartment. Observe the load-
ing guidelines (Y page 240).
Do not leave the SmartKey in the cargo com- partment. You could otherwise lock yourself
out.
The tailgate can be:
R opened and closed manually from outside
R released with the emergency release from
the inside Opening/closing from outside
Opening X
Press the %button on the SmartKey.
X Pull handle :.
X Raise the tailgate. Closing
X
Pull the tailgate down using handle :.
X Allow the tailgate to drop into the lock.
X If necessary, lock the vehicle with the &
button on the SmartKey or with KEYLESS-
GO. Tailgate emergency release
General notes !
The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and behind the tailgate.
i The opening dimensions of the tailgate
can be found in the "Vehicle data" section
(Y page 334).
If the tailgate can no longer be unlocked:
R using the SmartKey, or
R using the remote operating switch in the
door control panel:
Use the emergency release on the inside of
the tailgate.
You can reach the emergency release via the cargo compartment. 82
Cargo compartmentOpening and closing

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 25). Notes on breaking-in a new vehicle
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. 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. G
WARNING
Unsuitable footwear can hinder correct usage of the pedals, e.g.:
R shoes with thick soles
R shoes with high heels
R slippers
There is a risk of an accident.
Wear suitable footwear to ensure correct
usage of the pedals. G
WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk of an accident.
Do not switch off the ignition while driving. G
WARNING
If the parking brake has not been fully
released when driving, the parking brake can:
R overheat and cause a fire
R lose its hold function.
There is a risk of fire and an accident. Release
the parking brake fully before driving off.
! Before driving away, you must ensure
that, for your own safety and to avoid dam-
age, the charging cable has been removed
from the vehicle socket. Otherwise, you
cannot shift the transmission out of posi-
tion P.
The braking performance of the electric
motor using recuperative braking is, in some
operating modes, either reduced or not effec-
tive:
R when the condition of charge of the high-
voltage battery increases
R if the high-voltage battery is not yet at a
normal operating temperature
R when driving close to the maximum speed
R when the vehicle is almost stationary 130
DrivingDriving and parking

Drive program
Sis characterized by the fol-
lowing:
R the vehicle exhibits sporty driving charac-
teristics.
R the entire power output can be utilized by
depressing the accelerator pedal.
Drive program E+is characterized by the fol-
lowing:
R reduced torque and significantly reduced
power. This supports an especially efficient
and even driving style and results in a
reduction in speed to approximately
70 mph (110 km/h).
R the vehicle pulling away more gently in
forward gear unless the accelerator pedal
is depressed fully.
R the wheels are less likely to spin.
R particularly efficient overrun.
R full power output by using kickdown.
R the performance of air-conditioning system
and heating are reduced. Steering wheel paddle shifters
Manually adjustable recuperation :
Left-hand steering wheel paddle shifter -
; Right-hand steering wheel paddle shifter
+
You can increase or reduce recuperation in
overrun mode using the steering wheel pad-
dle shifters. When you remove your foot from
the accelerator pedal, recuperation occurs.
The electric motor is then used as a alternator and energy is recovered while driving. The
recuperated electrical energy is stored in the
high-voltage battery. A higher energy recu-
peration level means that the vehicle is
braked more powerfully.
If necessary, counteract the reduced regen-
erative braking effect by applying the brake
yourself.
Information on the Recuperative Braking Sys-
tem (Y page 68).
X To decrease recuperation: pull right-hand
steering wheel paddle shifter ;.
X To increase recuperation: pull left-hand
steering wheel paddle shifter :.
The various recuperation levels are shown in
the transmission position display once Dhas
been selected (Y page 134).
The following recuperation levels are availa-
ble in overrun mode:
R no recuperation (D +
, coasting mode)
R moderate recuperation (D)
R high recuperation (D -
)
R recuperation depending on the traffic sit-
uation (D AUTO
, radar-based)
You can see the intensity of recuperation in
overrun mode by reading the recuperation
performance value shown in the power dis-
play (Y page 183).
Every time drive position Dis selected, the
transmission switches into recuperation level
D AUTO
automatically.
The various different levels are to be used
under the following conditions: D
+ Driving without much braking
and without the presence of
obstacles or sharp bends
The vehicle retains the maxi-
mum possible amount of kinetic
energy. D
Normal driving138
TransmissionDriving an
d parking

D
- Sporty driving or driving on a
downhill gradient
The brake pedal does not need
to be used as often because the
extent of the deceleration is
greater than in D.
Energy use when decelerating is
considerably higher than when
the vehicle is braked with the
brake pedal. D
AUTO
(radar-
based) The intensity of recuperation is
automatically adjusted to the
current traffic situation.
Default setting
In levels
Dand D-
, deceleration can be con-
trolled in an infinitely variable manner using
the accelerator pedal.
The braking performance of the electric
motor using recuperative braking is, in some
operating modes, either reduced or not effec-
tive:
R when the condition of charge of the high-
voltage battery increases
R if the high-voltage battery is not yet at a
normal operating temperature
R when driving close to the maximum speed
R when the vehicle is almost stationary
R in transmission position N
R during and after ESP stability control
If you do not make an additional effort to
apply the brake yourself, the braking effect
may not be sufficient. If necessary, counter-
act the reduced regenerative braking effect
by applying the brake yourself.
Radar-based recuperation The vehicle uses the sensors of COLLISION
PREVENTION ASSIST PLUS during radar-
based recuperation (D
AUTO
). The sensors
detect the distance to the vehicle ahead and
its speed. The intensity of recuperation is then automatically adjusted to the current
traffic situation.
The range can then be increased by storing
energy efficiently. Adjustment is infinitely var-
iable from overrun mode (no recuperation) to maximum recuperation.
Maintain sufficient distance to the vehicle in
front. Mercedes-Benz recommends that you
activate COLLISION PREVENTION ASSIST
PLUS as a visual and acoustic aid.
Examples of radar-based recuperation:
R Approaching a slower vehicle, a decelerat-
ing vehicle or when following a vehicle
downhill. Your vehicle decelerates slightly
and increases recuperation.
R Driving when no vehicle is detected in front
or when a vehicle is detected in the far dis- tance or an accelerating vehicle is detec-
ted. Your vehicle switches to overrun mode
at higher speeds.
R Driving on a steep downhill slope. Acceler-
ation downhill is reduced and recuperation is increased. This is comparable with shift-
ing down when driving downhill.
X To activate radar-based recuperation:
pull steering wheel paddle shifter :or;
towards you and hold for about one second.
X To deactivate radar-based recupera-
tion: briefly pull steering wheel paddle
shifter :or; towards you.
If you change between radar-based and man- ual recuperation, the following levels are acti-
vated depending on the selection via the
steering wheel paddle shifters: ;
Steering
wheel paddle
shifter + selects
D+
(overrun) :
Steering
wheel paddle
shifter - selects
D-
(maximum
recuperation) Transmission
139Driving and parking Z

In particular, the function of the radar sensors
can be impaired in the case of:
R there is dirt on the sensors or anything else
covering the sensors
R there is snow or heavy rain
R there is interference by other radar sources
R there are strong radar reflections, for
example in parking garages
R a narrow vehicle traveling in front, e.g. a
motorbike
R a vehicle traveling in front on a different line
relative to the center of your vehicle
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensors checked at a qualified spe-
cialist workshop. This also applies to colli-
sions at slow speeds where there is no visible
damage to the front of the vehicle.
If the radar sensors are not available, the sys-
tem switches automatically to level Dwith
moderate recuperation. Have the radar sen-
sors checked at a qualified specialist work-
shop.
Automatic adjustment of recuperation
on downhill gradients The vehicle can detect steep downhill gradi-
ents. To reduce acceleration downhill and to
charge the high-voltage battery, recuperation is increased steplessly. This is comparable to
the engine brake in a combustion engine
when you downshift a gear on a downhill gra- dient.
Automatic adjustment of recuperation on
downhill gradients is available in level DAUTO
or on vehicles without steering wheel paddle
shifters in level D.
Intelligent recuperation The vehicle uses the map and camera data of
Traffic Sign Assist in addition to the sensors
of COLLISION PREVENTION ASSIST PLUS
during radar-based recuperation (D AUTO
). The
rate of recuperation is then automatically adjusted to the current traffic situation, tak-
ing the current and future maximum speed
into account. High-voltage battery
Important safety notes
G
DANGER
The vehicle's high voltage electrical system is under high voltage. If you modify components
in the vehicle's high-voltage electrical system or touch damaged components, you may be
electrocuted. The components in the vehi-
cle's high-voltage electrical system may be
damaged in an accident, although the damage
is not visible. There is a risk of fatal injury.
Following an accident, do not touch any high- voltage components and never modify the
vehicle's high-voltage electrical system. Have
the vehicle towed away after an accident and the vehicle's high-voltage electrical system
checked by a qualified specialist workshop. G
WARNING
In the event of a vehicle fire, the internal pres- sure of the high-voltage battery can exceed a
critical value. In this case flammable gas
escapes through a ventilation valve on the
underbody. The gas can ignite. There is a risk of injury.
Leave the danger zone immediately. Secure
the danger area at a suitable distance, whilst
observing legal requirements. G
DANGER
If you use incorrectly installed mains sockets or adapters, extension cables or similar to
connect the charging cable to a mains socket,
this could lead to fires or an electric shock.
There is a risk of fatal injury. 140
High-voltage batteryDriving and parking