check engine MERCEDES-BENZ B-Class 2017 W246 Owner's Manual

Pre-entry climate control at time
of departure (on-board computer
)..1 64
Pre-entry climate control via key ... 105
Pre-entry climate control via key
(on-board computer) ..................... .164
Problem with the rear window
defroster ........................................ 103
Problems with cooling with air
dehumidification ............................ 101
Refrigerant ..................................... 285
Refrigerant filling capacity ............. 286
Setting the air distribution ............. 102
Setting the air vents ..................... .106
Setting the airflow ......................... 102
Setting the temperature ................ 101
Switching air-recirculation mode
on/off ............................................ 104
Switching on/off ........................... 100
Switching the rear window
defroster on/off ............................ 103
Switching the ZONE function
on/off ............................................ 102
Cockpit
Overview .......................................... 31
COMAND
Generated electricity ..................... 120
Switching on/off ........................... 202
COMAND display
Cleaning ......................................... 238
Combination switch ............................ 88
Compass
Calibrating ..................................... 229
Calling up ....................................... 228
Magnetic field zone maps .............. 229
Setting .......................................... .229
Connecting a USB device
see also Digital Operator's Man-
ual ................................................. .201
Consumption statistics (on-board
computer) .......................................... 156
Controller .......................................... .202
Convenience closing feature .............. 77
Convenience opening feature ............ 76
Convenience opening/closing (air-
recirculation mode) ........................... 104
Coolant (engine)
Checking the level ......................... 232 Filling capacity ............................... 285
Important safety notes .................. 284
Cooling
see Climate control
Copyright ............................................. 29
Cornering light function
Changing the bulb ............................ 93
Display message ............................ 178
Function/notes ................................ 89
Cruise control
Activation conditions ..................... 137
Cruise control lever ....................... 136
Deactivating ................................... 137
Display message ............................ 184
Driving system ............................... 136
Function/notes ............................ .136
Important safety notes .................. 136
Setting a speed .............................. 137
Storing and maintaining current
speed ............................................. 137
Cup holder
Center console .............................. 216
Important safety notes .................. 216
Rear compartment ......................... 217
Customer Assistance Center
(CAC) ..................................................... 27
Customer Relations Department ....... 27 D
Data see Technical data
Daytime running lamps
Display message ............................ 180
Function/notes ................................ 87
Switching on/off (on-board com-
puter) ............................................. 166
Declarations of conformity ................. 26
Departure time
Setting (on-board computer) .......... 163
Diagnostics connection ......................26
Digital Operator's Manual
Help ................................................ .21
Introduction .....................................21
Digital speedometer .........................158
DIRECT SELECT lever
Transmission ................................. 112 Index
7

vehicle in front, for vehicle speed, for braking in
good time, and for staying in lane. Always adapt your driving style to suit the prevailing road and
weather conditions and maintain a safe distance from the vehicle in front. Drive carefully.
The driving safety systems described only work
as effectively as possible when there is ade-
quate contact between the tires and the road
surface. Please pay special attention to the
notes on tires, recommended minimum tire
tread depths, etc. (Y page 257).
In wintry driving conditions, always use winter
tires (M+S tires) and if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible. ABS (Anti-lock Braking System)
General information ABS regulates brake pressure in such a way that
the wheels do not lock when you brake. This
allows you to continue steering the vehicle when braking.
The 0025 ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out when the engine is running.
ABS works from a speed of about 5 mph
(8 km/h), regardless of road-surface conditions. ABS works on slippery surfaces, even when you
only brake gently.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 58). G
WARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further driving safety systems are deac-
tivated. There is an increased danger of skid- ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at a qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp (Y page 193) and dis-play messages which may be shown in the
instrument cluster (Y
page 168).
Braking X
If ABS intervenes: continue to depress the
brake pedal vigorously until the braking sit-
uation is over.
X To make a full brake application: depress
the brake pedal with full force.
If ABS intervenes when braking, you will feel a
pulsing in the brake pedal.
The pulsating brake pedal can be an indication
of hazardous road conditions, and functions as a reminder to take extra care while driving. BAS (Brake Assist System)
General information BAS operates in emergency braking situations.
If you depress the brake pedal quickly, BAS
automatically boosts the braking force, thus
shortening the stopping distance.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 58). G
WARNING
If BAS is malfunctioning, the braking distance
in an emergency braking situation is
increased. There is a risk of an accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
Braking X
Keep the brake pedal firmly depressed until
the emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated. Driving safety systems
59Safety Z

R
to crossing traffic
R when cornering
As a result, Adaptive Brake Assist may not
intervene in all critical conditions. There is a
risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake. G
WARNING
Adaptive Brake Assist cannot always clearly
identify objects and complex traffic situa-
tions.
In such cases, Adaptive Brake Assist might:
R intervene unnecessarily
R not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake. Terminate the
intervention in a non-critical driving situation.
Due to the nature of the system, complex but
non-critical driving conditions may also cause
Active Brake Assist to intervene.
Even if Active Brake Assist is not available due to a malfunction in the radar sensor system, the
brake system is still available with full brake
boosting effect and BAS. ESP
®
(Electronic Stability Program)
General notes i
Observe the "Important safety notes" sec-
tion (Y page 58).
ESP ®
monitors driving stability and traction, i.e.
power transmission between the tires and the
road surface.
If ESP ®
detects that the vehicle is deviating from
the direction desired by the driver, one or more
wheels are braked to stabilize the vehicle. The
engine output is also modified to keep the vehi- cle on the desired course within physical limits.
ESP ®
assists the driver when pulling away on
wet or slippery roads. ESP ®
can also stabilize
the vehicle during braking. ETS (Electronic Traction System) i
Observe the "Important safety notes" sec-
tion (Y page 58).
ETS traction control is part of ESP ®
.
Traction control brakes the drive wheels indi-
vidually if they spin. This enables you to pull
away and accelerate on slippery surfaces, for
example if the road surface is slippery on one
side. In addition, more drive torque is transfer-
red to the wheel or wheels with traction.
Traction control remains active, even if you
deactivate ESP ®
.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 58). G
WARNING
If ESP ®
is malfunctioning, ESP ®
is unable to
stabilize the vehicle. Additionally, further driv- ing safety systems are deactivated. This
increases the risk of skidding and an accident.
Drive on carefully. Have ESP ®
checked at a
qualified specialist workshop.
When towing your vehicle with the front axle
raised, observe the notes on ESP ®
(Y page 253).
When towing the vehicle with the rear axle
raised, observe the notes on ESP ®
(Y page 254).
If the 00BB ESP®
OFF warning lamp lights up
continuously, ESP ®
is deactivated.
If the 00E5 ESP®
warning lamp and the 00BB
warning lamp are lit continuously, ESP ®
is not
available due to a malfunction.
Observe the information on warning lamps
(Y page 195) and display messages which may
be shown in the instrument cluster
(Y page 168).
Only use wheels with the recommended tire
sizes. Only then will ESP ®
function properly. 62
Driving safety systemsSafety

SmartKey positions
SmartKey 005A
To remove the SmartKey
(shift the transmission to position P)
0047 Power supply for some consumers, such as
the windshield wipers
0048 Ignition (power supply for all consumers)
and drive position
0049 To start the engine
i The SmartKey can be turned in the ignition
lock even if it is not the correct SmartKey for
the vehicle. The ignition is not switched on.
The drive system cannot be started.
Start/Stop button General notes
Vehicles with KEYLESS-GO are equipped with
SmartKeys featuring the integrated KEYLESS-
GO function and a detachable Start/Stop but-
ton.
A check which periodically establishes a radio
connection between the vehicle and the Smart-
Key determines whether a valid SmartKey is in
the vehicle. This occurs, for example, when
starting the drive system.
When you insert the Start/Stop button into the
ignition lock, the system needs approximately
two seconds recognition time. You can then use the Start/Stop button.
Pressing the Start/Stop button several times in
succession corresponds to the different Smart- Key positions in the ignition lock. This is only the
case if you are not depressing the brake pedal.
If you depress the brake pedal and press the
Start/Stop button, the drive system starts
immediately. To start the vehicle without actively using the
SmartKey:
R
the Start/Stop button must be inserted in the
ignition lock.
R the SmartKey must be in the vehicle.
R the vehicle must not be locked with the
SmartKey or KEYLESS-GO (Y page 66)
Do not keep the KEYLESS-GO key:
R with electronic devices, e.g. a mobile phone
or another SmartKey.
R with metallic objects, e.g. coins or metal foil.
R inside metallic objects, e.g. a metal case
This can affect the functionality of KEYLESS-GO.
If you lock the vehicle with the SmartKey remote
control or with KEYLESS-GO, after a short time:
R you will not be able to switch on the ignition
with the Start/Stop button.
R you will no longer be able to start the drive
system with the Start/Stop button until the
vehicle is unlocked again
If you lock the vehicle centrally using the button
on the front door (Y page 72), you can continue
to start the drive system with the Start/Stop
button.
The drive system can be switched off while the
vehicle is in motion by pressing and holding the Start/Stop button for three seconds.
Key positions with the Start/Stop button 0043
Start/Stop button
0044 Ignition lock
As soon as the ignition is switched on, all the
indicator lamps in the instrument cluster light
up.
For further information on situations in which an indicator lamp either fails to go out after the
drive system is started or lights up while driving, Driving
109Driving and parking Z

The braking performance of the electric motor
using recuperative braking is, in some operating modes, either reduced or not effective:
R when the condition of charge of the high-volt-
age battery increases
R if the high-voltage battery is not yet at a nor-
mal operating temperature
R when driving close to the vehicle's maximum
design 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, counteract the reduced
regenerative braking effect by applying the
brake yourself.
Radar-based recuperation The vehicle uses the Active Brake Assist sensors
during radar-based recuperation ( DAUTO
). The
sensors detect the distance to the vehicle ahead
and its speed. The intensity of recuperation is
then automatically adjusted to the current traf-
fic situation.
The range can then be increased by storing
energy efficiently. Adjustment is infinitely vari-
able from overrun mode (no recuperation) to
maximum recuperation.
Maintain sufficient distance to the vehicle in
front. Mercedes-Benz recommends that you
activate Active Brake Assist as a visual and
acoustic aid.
Examples of radar-based recuperation:
R Approaching a slower vehicle, a decelerating
vehicle or when following a vehicle downhill.
Your vehicle decelerates slightly and increa-
ses recuperation.
R Driving when no vehicle is detected in front or
when a vehicle is detected in the far distance or an accelerating vehicle is detected. Your
vehicle switches to overrun mode at higher
speeds.
R Driving on a steep downhill slope. Accelera-
tion downhill is reduced and recuperation is
increased. This is comparable with shifting
down when driving downhill. X
To activate radar-based recuperation: pull
steering wheel paddle shifter 0043or0044
towards you and hold for about one second.
X To deactivate radar-based recuperation:
briefly pull steering wheel paddle shifter 0043
or 0044 towards you.
If you change between radar-based and manual
recuperation, the following levels are activated
depending on the selection via the steering
wheel paddle shifters: 0043
Steering wheel
paddle shifter - selects
D-
(maximum
recuperation) 0044
Steering wheel
paddle shifter + selects
D+
(overrun) 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 exam-
ple in parking garages
R a narrow vehicle is traveling in front, e.g. a
motorbike
R a vehicle is traveling in front on a different line
relative to the center of your vehicle
Following damage to the front end of the vehicle,
have the radar sensor settings and operation
checked at a qualified specialist workshop
immediately. This also applies to collisions at
slow speeds where there is no visible damage to the front of the vehicle.
If the radar sensors are not available, the system switches automatically to level Dwith moderate
recuperation. Have the radar sensors checked
at a qualified specialist workshop immediately.
Automatic adjustment of recuperation
on downhill gradients The vehicle can detect steep downhill gradients.
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 gradient.
Automatic adjustment of recuperation on down-
hill gradients is available in level DAUTO
or on 116
TransmissionDriving and parking

relevant power socket checked by an electri-
cian.
X To adjust the setting: press button0085
repeatedly until the desired setting is selec-
ted in display 0087.
R Two LEDs are flashing: minimum setting
R All LEDs are flashing: maximum setting
Information about the charging time
(Y page 286)
If, after the charging process, the charging cable
is:
R left connected to the mains socket, the set
value will be used for the next charging proc-
ess.
R removed from the power socket, the values
will be reset to the minimum setting for the
next charging process. You may then need to
reset the values of the maximum charge cur-
rent.
If the charge current values that have been set
on the charging cable and the on-board com-
puter are different, the high-voltage battery is
charged using the lower value.
If the vehicle requires more time than usual to
charge the high-voltage battery, check:
R the settings of the maximum charge current
on the controls of the charging cable
R the settings of the maximum charge current in
the menu of the on-board computer Connecting the charging cable 0043
To open the charge socket flap
0044 Tire pressure table
0087 Socket cap
0085 Fastener
0083 Reference sticker (voltage range)
0084 Vehicle socket
006B Warning sticker (charging cable)
X Shift the DIRECT SELECT lever to position P.
X Switch the ignition off.
X Press the charge socket flap in the direction
of arrow 0043.
The charge socket flap swings up.
X Slide fastener 0085to the right.
Socket cap 0087is open.
X Insert the power supply plug into the electri-
cal outlet to the stop.
X Insert the charging cable connector into vehi-
cle socket 0084to the stop.
The high-voltage battery is being charged.
The vehicle must not be moved while the charg-
ing cable is connected or during charging.
i Depending on the temperature, the engine
cooling system and battery cooling system
may audibly switch on when the charging 124
High-voltage batteryDriving and parking

The vehicle must not be moved while the charg-
ing cable is connected or during charging.
i Depending on the temperature, the engine
cooling system and battery cooling system
may audibly switch on when the charging
cable is connected or during the charging
process.
Removing the charging cable !
Before driving away, you must ensure that,
for your own safety and to avoid damage, the
charging cable has been removed from the
vehicle socket. Otherwise, you cannot shift
the transmission out of position P.
When the charge level display reaches 100%,
the battery is fully charged (Y page 153). When the battery is charged:
X Press and hold button 006Con the charging
cable connector and remove the charging
cable from vehicle socket 0084.
X Close socket cap 0087.
X Close the charge socket flap. Problems with the charging process
Problem
Possible causes/consequences and
0050 0050Solutions The charge socket flap
cannot be opened. The charge socket flap is not unlocked.
X Unlock the vehicle (Y page 66). The SmartKey batteries are discharged.
X Unlock the vehicle manually using the SmartKey (Y page 68).The charge socket flap is unlocked, but the opening mechanism is
jammed.
X Lock and unlock the vehicle.
If, after that, the opening mechanism is still jammed:
X Consult a qualified specialist workshop. The high-voltage battery
is not being charged. A malfunction has occurred during the initialization of the charging
process.
X Ensure that the charging cable is connected to the electrical outlet.
X Remove the charging cable connector from the vehicle socket and
wait 30 seconds; then re-insert it into the vehicle socket.
X If the problem persists, consult a qualified specialist workshop. The high-voltage battery
is not charged during the
charging process when
connected to a power
socket. The electrical outlet is faulty.
X Have the electrical outlet checked to test if it is functioning prop-
erly.
or X Use a different electrical outlet. 126
High-voltage batteryDriving and parking

Wet roads
If you have driven for a long time in heavy rain
without braking, there may be a delayed reac-
tion from the brakes when braking for the first
time. This may also occur after the vehicle has
been washed or driven through deep water.
You have to depress the brake pedal more
firmly. Maintain a greater distance from the
vehicle in front.
After driving on a wet road or having the vehicle
washed, brake firmly while paying attention to
the traffic conditions. This will warm up the
brake discs, thereby drying them more quickly
and protecting them against corrosion.
Limited braking performance on salt-
treated roads If you drive on salted roads, a layer of salt resi-
due may form on the brake discs and brake
pads. This can result in a significantly longer
braking distance.
R In order to prevent any salt build-up, apply the
brakes occasionally while paying attention to
the traffic conditions.
R Carefully depress the brake pedal and the
beginning and end of a journey.
R Maintain a greater distance to the vehicle
ahead.
Servicing the brakes !
The brake fluid level may be too low, if:
R if the red brake warning lamp lights up in
the instrument cluster and
R you hear a warning tone while the engine is
running
Observe additional warning messages in the
multifunction display.
The brake fluid level may be too low due to
brake pad wear or leaking brake lines.
Have the brake system checked immediately.
Consult a qualified specialist workshop to
arrange this.
! A function or performance test should only
be carried out on a 2-axle dynamometer. If
you wish to operate the vehicle on such a
dynamometer, please consult a qualified spe- cialist workshop in advance. You could oth-
erwise damage the drive train or the brake
system. !
As the ESP ®
system operates automatically,
the engine and the ignition must be switched
off (the SmartKey must be in position 0or 1in
the ignition lock) if:
R the electric parking brake is tested on a
brake dynamometer (for a maximum of
ten seconds)
R the vehicle is towed with the front axle
raised.
Braking triggered automatically by ESP ®
may
seriously damage the brake system.
All checks and maintenance work on the brake
system must be carried out at a qualified spe-
cialist workshop.
Have brake pads installed and brake fluid
replaced at a qualified specialist workshop.
If the brake system has only been subject to
moderate loads, you should test the functional- ity of your brakes at regular intervals.
You can find a description of Brake Assist (BAS)
on (Y page 59).
Mercedes-Benz recommends that you only have brake pads/linings installed on your vehicle
which have been approved for Mercedes-Benz
vehicles or which correspond to an equivalent
quality standard. Brake pads/linings which havenot been approved for Mercedes-Benz vehicles
or which are not of an equivalent quality could
affect your vehicle's operating safety.
Mercedes-Benz recommends that you only use
brake fluid that has been specially approved for
your vehicle by Mercedes-Benz, or which corre- sponds to an equivalent quality standard. Brakefluid which has not been approved for
Mercedes-Benz vehicles or which is not of an
equivalent quality could affect your vehicle's
operating safety.
Checking brake lining thickness You can measure the break pad/lining thick-
ness using a test gage. Color-coding (green or
red) on the test gage allows you to determine
whether the brake pad/lining thickness is still
sufficient. The test gage is in the vehicle docu-
ment wallet in the glove box. 134
Driving tipsDriving and parking

Front wheel
Rear wheel
X Bring the vehicle and wheels into a suitable
position so that you can attach test gage 0083.
X Secure the vehicle against rolling away
(Y page 128).
X Engage park position P.
X Switch off the drive system.
X Place test gage 0083between the wheel's
spokes on brake pad/lining 0087.X
Hold test gage 0083vertically on brake disc 0043
and slide measuring pin 0044onto brake
disc 0043.
X Check which color field 0085the arrow on
measuring pin 0044is pointing to.
Green: the brake pad/lining thickness is suf-
ficient.
Red: the brake pad/lining thickness is not
sufficient. Have the brake pads/lining
checked at a qualified specialist workshop.
To avoid an inaccurate measurement: R make sure you position the wheels suitably
R do not put the measuring pin on a recess in
the brake disc Driving on wet roads
Hydroplaning If water has accumulated to a certain depth on
the road surface, there is a danger of hydro-
planing occurring, even if:
R you drive at low speeds
R the tires have adequate tread depth
For this reason, in the event of heavy rain or in
conditions in which hydroplaning may occur,
you must drive in the following manner:
R lower your speed
R avoid ruts
R avoid sudden steering movements
R brake carefully
Driving on flooded roads !
Do not drive through flooded areas. Check
the depth of any water before driving through
it. Drive slowly through standing water. Oth-
erwise, water may enter the vehicle interior or
the engine compartment. This can damage
the electronic components in the engine or
the automatic transmission. Water can also
be drawn in by the engine's air suction nozzles and this can cause engine damage. Winter driving
G
WARNING
If you increase the recuperation level on slip- pery road surfaces, the drive wheels may lose Driving tips
135Driving and parking
Z

Display messages
Possible causes/consequences and
0050
0050Solutions 00F0
Malfunction Visit Malfunction Visit
Workshop Workshop Malfunctions are present in the drive system and/or in the cooling
system.
X Visit a qualified specialist workshop immediately. Without starting Without starting
engine again, con‐ engine again, con‐
sult workshop sult workshop The vehicle's high-voltage electrical system is malfunctioning. A warn-
ing tone also sounds.
X Do not switch off the drive system.
X Visit a qualified specialist workshop immediately. 00F0
Stop Switch Engine Stop Switch Engine
Off Off There is a serious malfunction in the drive system. A warning tone also
sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Do not tow the vehicle.
X Consult a qualified specialist workshop immediately. Driving systems
Display messages
Possible causes/consequences and
0050 0050Solutions 00AD
Attention Assist: Attention Assist:
Take a Break! Take a Break! Based on certain criteria, ATTENTION ASSIST has detected fatigue or
a lack of concentration on the part of the driver. A warning tone also
sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so you get
enough rest. 00AD
Attention Assist Attention Assist
Inoperative Inoperative ATTENTION ASSIST is inoperative.
X Visit a qualified specialist workshop. 00D9
Off Off The HOLD function is deactivated. the vehicle is skidding.
A warning tone also sounds.
X Reactivate the HOLD function later (Y page 138). The HOLD function is deactivated. When the brake pedal is firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.
X Check the activation conditions for the HOLD function
(Y page 138). 182
Display
messagesOn-board computer and displays