change key battery MERCEDES-BENZ B-Class ELECTRIC 2015 W246 Owner's Manual

Cargo tie down rings
.........................245
CD player/CD changer (on-board
computer) .......................................... 191
Center console
Lower section .................................. 35
Upper section .................................. 34
Central locking
Automatic locking (on-board com-
puter) ............................................. 198
Locking/unlocking (SmartKey) ....... .72
Changing bulbs
Cornering light function ................ .109
High-beam headlamps ................... 108
License plate lighting ..................... 110
Low-beam headlamps .................... 108
Parking lamps ................................ 108
Rear fog lamp ................................ 109
Reversing lamps ............................ 109
Standing lamps (front) ................... 108
Turn signals (front) ......................... 108
Charge level display .......................... 184
Charging
with RANGE PLUS .......................... 196
see Charging the high-voltage battery
Charging cable
Connecting ................................... .148
Controls ......................................... 146
Important safety notes .................. 146
Removing ....................................... 148
Storing .......................................... .146
Warming up ................................... 145
Charging the high-voltage battery
(important safety notes) ................... 140
Child
Restraint system .............................. 57
Child seat
Forward-facing restraint system ...... 61
LATCH-type (ISOFIX) child seat
anchors ............................................ 58
On the front-passenger sea t............ 60
Rearward-facing restraint system .... 60
Top Tether ....................................... 59
Child-proof locks
Important safety notes .................... 61
Rear doors ....................................... 62
Children
Special seat belt retractor ............... 57 Cigarette lighter
................................ 252
Cleaning
Mirror turn signal ........................... 275
Climate control
Automatic climate control (dual-
zone) .............................................. 117
Auxiliary climate control (on-
board computer) ............................ 196
Controlling automaticall y............... 120
Convenience opening/closing
(air-recirculation mode) ................. 123
Cooling with air dehumidification .. 118
Defrosting the window s................. 122
Defrosting the windshield .............. 121
General notes ................................ 116
Immediate pre-entry climate con-
trol ................................................. 125
Indicator lamp ................................ 120
Information about using auto-
matic climate control ..................... 117
Maximum cooling .......................... 122
Overview of systems ...................... 116
Pre-entry climate control at
departure time ............................... 125
Pre-entry climate control at time
of departure (on-board computer) .. 196 Pre-entry climate control via key ... 124
Pre-entry climate control via key
(on-board computer) ...................... 196
Problem with the rear window
defroster ........................................ 123
Problems with cooling with air
dehumidification ............................ 120
Refrigerant ..................................... 333
Refrigerant filling capacity ............. 334
Setting the air distribution ............. 120
Setting the air vents ...................... 126
Setting the airflow ......................... 121
Setting the temperature ................ 120
Switching air-recirculation mode
on/of f............................................ 123
Switching on/of f........................... 118
Switching the rear window
defroster on/of f............................ 122
Switching the ZONE function on/
off .................................................. 121
Cockpit
Overview .......................................... 30 6
Index

X
To deactivate: press the&button on
the SmartKey twice in rapid succession.
The battery check lamp of the SmartKey
(Y page 75) lights up twice briefly and
KEYLESS-GO is deactivated.
X To activate: press any button on the
SmartKey or insert the SmartKey into the
ignition lock.
KEYLESS-GO and all of its associated fea-
tures are available again. KEYLESS-GO start function
Bear in mind that the engine can be started by any of the vehicle occupants if there is a
SmartKey in the vehicle. Changing the settings of the locking
system
You can change the settings of the locking
system. This means that only the driver's door and the charge socket flap are unlocked when the vehicle is unlocked. This is useful if you
frequently travel on your own.
X To change the setting: simultaneously
press the %and& buttons for
approximately 6 seconds until the battery
check lamp (Y page 75) flashes twice.
i If the setting of the locking system is
changed within the signal range of the vehi- cle, pressing the &or% button:
R locks or
R unlocks the vehicle
The SmartKey now functions as follows:
X To unlock the driver's door: press the
% button once.
X To unlock centrally: press the%but-
ton twice.
X To lock centrally: press the&button. The KEYLESS-GO function is changed as fol-
lows:
X To unlock the driver's door: touch the
inner surface of the door handle on the
driver's door.
X To unlock centrally: touch the inner sur-
face of the door handle on the front-
passenger door or the rear door.
X To lock centrally: touch the outer sensor
surface on one of the door handles.
X To restore the factory settings: simulta-
neously press the %and& buttons
for approximately 6 seconds until the bat-
tery check lamp flashes twice
(Y page 75). Mechanical key
General notes 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 or the trunk lid, the
anti-theft alarm system will be triggered
(Y page 69).
There are several ways to turn off the alarm:
X To turn the alarm off with the SmartKey:
press the %or& button on the
SmartKey.
or X Insert the SmartKey into the ignition lock.
or
X To deactivate the alarm with KEYLESS-
GO: press the Start/Stop button in the igni-
tion lock. The SmartKey must be in the
vehicle.
or X Lock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside the
vehicle. 74
SmartKeyOpening and closing

If you unlock the vehicle using the mechanical
key, the charge socket flap will not be
unlocked automatically.
Removing the mechanical key X
Push release catch :in the direction of
the arrow and at the same time remove
mechanical key ;from the SmartKey.
For further information about:
R unlocking the driver's door (Y page 80)
R unlocking the cargo compartment
(Y page 82)
R locking the vehicle (Y page 81)
Inserting the mechanical key X
Push mechanical key ;completely into
the SmartKey until it engages and release
catch :is back in its basic position. SmartKey battery
Important safety notes G
WARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is a risk of fatal injury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention immediately.
The SmartKey batteries contain perchlorate
material, which may require special handling and regard for the environment. National
guidelines must be observed during disposal.
In California, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/
index.cfm.
Mercedes-Benz recommends that you have
the battery replaced at a qualified specialist
workshop.
Checking the battery X
Press the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
X Change the battery (Y page 75).
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the &or% button:
R locks or
R unlocks the vehicle
i You can get a battery at any qualified spe-
cialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery.
X Take the mechanical key out of the Smart-
Key (Y page 74). SmartKey
75Opening and closing Z

Problems with the seat heating
Problem
Possible causes/consequences and
M
MSolutions The seat heating has
switched off prema-
turely or cannot be
switched on. The on-board voltage is too low because too many electrical con-
sumers 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. 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, steer-
ing wheel and mirror and fasten your seat belt before starting the vehicle's drive system. 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
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.
:
Release lever
; To adjust the steering wheel height
= To adjust the steering wheel position
(fore-and-aft adjustment)
X Push release lever :down completely.
The steering column is unlocked.
X Adjust the steering wheel to the desired
position.
X Push release lever :up 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
93Seats, steering wheel and mirrors Z

Display messages
Possible causes/consequences and
M
MSolutions Hazard Warning
Hazard Warning
Flashers Malfunc‐ Flashers Malfunc‐
tioning tioning The hazard warning lamps are faulty.
X Visit a qualified specialist workshop. î
Charger Cable Con‐ Charger Cable Con‐
nected nected The charging cable is still connected to the vehicle socket.
X Remove the charging cable from vehicle socket. SmartKey
Display messages
Possible causes/consequences and
M
MSolutions Â
Key Does Not Key Does Not
Belong to Vehicle Belong to Vehicle You have put the wrong SmartKey in the ignition lock.
X Use the correct SmartKey. Â
Take Take
Your
YourKey
Keyfrom
from
Ignition
Ignition The SmartKey is in the ignition lock.
X Remove the SmartKey. Â
Obtain a New Key Obtain a New Key The SmartKey needs to be replaced.
X Visit a qualified specialist workshop. Â
Replace Replace
Key
KeyBattery
Battery The SmartKey battery is discharged.
X Change the battery (Y page 75).Â
Don't Forget Your Don't Forget Your
Key Key The display message is shown for a maximum of 60 seconds and
is only a reminder.
You open the driver's door with the drive system switched off. The SmartKey is not in the ignition lock.
X Take the SmartKey with you when you leave the vehicle. Â
Key Not Detected Key Not Detected
(red display message) The SmartKey is not in the vehicle.
A warning tone also sounds.
If the drive system is switched off, you can no longer lock the
vehicle centrally or start the drive system.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 153).
X Locate the SmartKey. 226
Display
messagesOn-board computer and displays

Installing/removing the towing eye
Installing the towing eye Example: towing eye mounting covers
X Remove the towing eye from the stowage
space.
The towing eye is located in the stowage
well under the cargo compartment floor.
Vehicles with the TIREFIT kit: the towing
eye is beneath the tire inflation compres-
sor.
X Press the mark on cover :inwards in the
direction of the arrow.
X Take cover :off the opening.
X Screw in the towing eye clockwise to the
stop.
Removing the towing eye X
Unscrew and remove the towing eye.
X Attach cover :to the bumper and press
until it engages.
X Place the towing eye in the stowage well
(Y page 280) beneath the cargo compart-
ment floor in the cargo compartment.
X Vehicles with the TIREFIT kit: put back the
tire inflation compressor. Towing a vehicle with both axles on
the ground
It is important that you observe the safety
instructions when towing away your vehicle
(Y page 292).
X On vehicles with KEYLESS-GO or the
KEYLESS-GO start function: you must
use the SmartKey instead of the Start/Stop
button (Y page 132).
The transmission automatically shifts to posi- tion Pwhen you open the driver's or front-
passenger door or when you remove the
SmartKey from the ignition lock. In order to
ensure that the transmission stays in position N when towing the vehicle, you must observe
the following points:
X Make sure that the vehicle is stationary.
X Turn the SmartKey to position 2in the igni-
tion lock.
X Depress and hold the brake pedal.
X Shift the transmission to position N.
X Release the brake pedal.
X Release the electric parking brake.
X Switch on the hazard warning lamps
(Y page 102).
X Leave the SmartKey in position 2in the
ignition lock.
If the 12 V battery indicator lamp lights up,
you must observe the following points:
X Pull over and stop the vehicle safely as soon
as possible, paying attention to road and
traffic conditions.
X Shift the transmission to position P.
X Apply the electric parking brake.
i In order to signal a change of direction
when towing the vehicle with the hazard
warning lamps switched on, use the com-
bination switch as usual. In this case, only
the indicator lamps for the direction of
travel flash. After resetting the combina-
tion switch, the hazard warning lamp starts
flashing again. 294
TowingRoadside Assistance