light sensor MERCEDES-BENZ B-Class 2017 W246 User Guide

Range
0043
Detection range of front sensors
0044 Detection range of rear sensors
Front sensors Center Approx. 40 in (approx.
100 cm) Corners Approx. 24 in (approx.
60 cm) Rear sensors
Center Approx. 48 in (approx.
120 cm)
Corners Approx. 32 in (approx.
80 cm)
Minimum distance
Center Approx. 8 in (approx. 20 cm)
Corners Approx. 6 in (approx. 15 cm)
If there is an obstacle within this range, the rel-
evant warning displays light up and a warning
tone sounds. If the distance falls below the min- imum, the distance may no longer be shown. Warning displays
0043
Segments on the left-hand side of the vehi-
cle
0044 Segments on the right-hand side of the vehi-
cle
0087 Segments showing operational readiness
The warning displays show the distance
between the sensors and the obstacle. The
warning display for the front area is located on
the dashboard above the center air vents. The
warning display for the rear area is located on
the headliner in the rear compartment.
The warning display for each side of the vehicle
is divided into five yellow and two red segments.
Parking Assist PARKTRONIC is operational if yel-
low segments showing operational readiness 0087
light up.
The transmission position of the automatic
transmission and the direction in which the vehi-
cle is rolling determine which warning display is active when the engine is running. Transmission posi-
tion Warning display
D
Front area activated
R,
Nor the vehicle is
rolling backwards Rear and front areas
activated
P
No areas activated
One or more segments light up as the vehicle
approaches an obstacle, depending on the vehi-
cle's distance from the obstacle.
From the:
R sixth segment onwards, you will hear an inter-
mittent warning tone for approximately two
seconds.
R seventh segment onwards, you will hear a
warning tone for approximately two seconds. 140
Driving systemsDriving and parking

This indicates that you have now reached the
minimum distance.
Deactivating or activating Parking
Assist PARKTRONIC 0043
Indicator lamp
0044 Deactivates or activates Parking Assist
PARKTRONIC If indicator lamp
0043is lit, Parking Assist
PARKTRONIC is deactivated.
i Parking Assist PARKTRONIC is automati-
cally activated when you turn the SmartKey to
position 2in the ignition lock.
Problems with Parking Assist PARKTRONIC Problem
Possible causes/consequences and
0050 0050Solutions Only the red segments in
the Parking Assist
PARKTRONIC warning
displays are lit. You also
hear a warning tone for
approximately two sec-
onds.
Parking Assist
PARKTRONIC is then
deactivated and the indi-
cator lamp on the
PARKTRONIC button
lights up. Parking Assist PARKTRONIC has malfunctioned and has been deacti-
vated.
X If problems persist, have Parking Assist PARKTRONIC checked at a
qualified specialist workshop. Only the red segments in
the Parking Assist
PARKTRONIC warning
displays are lit. Parking
Assist PARKTRONIC is
then deactivated. The Parking Assist PARKTRONIC sensors are dirty or there is inter-
ference.
X Clean the Parking Assist PARKTRONIC sensors (Y page 237).
X Switch the ignition back on. The problem may be caused by an external source of radio or ultra-
sound waves.
X Check to see if Parking Assist PARKTRONIC works at a different
location. Driving systems
141Driving and parking Z

Important safety notes
G
WARNING
If you operate information systems and com-
munication equipment integrated in the vehi- cle while driving, you will be distracted from
traffic conditions. You could also lose control of the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
You must observe the legal requirements for the country in which you are currently driving whenoperating the on-board computer. G
WARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety. The operating safety of your vehicle may be
impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer only shows messages or
warnings from certain systems in the multifunc- tion display. You should therefore make sure
your vehicle is operating safely at all times.
If the operating safety of your vehicle is
impaired, pull over as soon as it is safe to do so. Contact a qualified specialist workshop.
For an overview, see the instrument panel illus-
tration (Y page 32). Displays and operation
Instrument cluster lighting
The light sensor in the instrument cluster auto-
matically controls the brightness of the multi-
function display. In daylight, the displays in the
instrument cluster are not illuminated.
The lighting in the instrument cluster, in the dis-
plays and the controls in the vehicle interior can be adjusted using the brightness control knob. The brightness control knob is located on the
bottom left of the instrument cluster
(Y
page 32).
X Turn the brightness control knob clockwise or
counter-clockwise.
If the light switch is set to the 0058,0060or
0058 position, the brightness is dependent
upon the brightness of the ambient light. READY indicator
When the drive system is started and the vehicle
is ready to drive, READY indicator 0043appears in
the multifunction display. This indicates that the vehicle is operational. Outside temperature display
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Bear in mind that the outside temperature dis-
play indicates the temperature measured and
does not record the road temperature.
The outside temperature display is in the multi-
function display (Y page 155).
There is a short delay before a change in outside
temperature appears in the multifunction dis-
play. E-CELL display
G
WARNING
There is a risk of an accident if you accelerate or overtake when the power output of the
drive system is reduced.
You should therefore adapt your driving style
and drive particularly carefully. Charge the
high-voltage battery at a charge station imme- diately. 152
Displays and operationOn-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions 0049
Check Rear Left Check Rear Left
Sidemarker Lamp Sidemarker Lamp
or
Check Rear Right
Check Rear Right
Sidemarker Lamp Sidemarker Lamp The rear left-hand or rear right-hand side marker lamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 90).
or
X Visit a qualified specialist workshop. 0049
Check Left Daytime Check Left Daytime
Running Light Running Light
or
Check
Check Right
RightDaytime
Daytime
Running Light
Running Light The left or right-hand daytime running lamp is faulty.
X Visit a qualified specialist workshop. 0049
Active Headlamps Active Headlamps
Inoperative Inoperative The active light function is faulty.
X Visit a qualified specialist workshop. 0049
Malfunction See Malfunction See
Operator's Manual Operator's Manual The exterior lighting is malfunctioning.
X Visit a qualified specialist workshop. 0049
Auto Lamp Function Auto Lamp Function
Inoperative Inoperative The light sensor is defective.
X Visit a qualified specialist workshop. 0049
Switch Off Lights Switch Off Lights The lights are still switched on when you leave the vehicle. A warning
tone also sounds.
X Turn the light switch to the 0058position. 0049
Switch On Headlamps Switch On Headlamps You are driving with low-beam headlamps switched off.
X Turn the light switch to the 0058or0058 position. 180
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions Blind Spot Assist
Blind Spot Assist
Currently Unavaila‐ Currently Unavaila‐
ble See Operator's ble See Operator's
Manual Manual Blind Spot Assist is temporarily inoperative.
Possible causes are:
R the radar sensor system is temporarily inoperative, e.g. due to elec-
tromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation
R the radar sensor system is outside the operating temperature range
The yellow 0063indicator lamps also light up in the exterior mirrors.
When the causes stated above no longer apply, the display message
disappears.
Blind Spot Assist is operational again.
If the display message does not disappear:
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 128).
X Start the drive system again. Blind Spot Assist Blind Spot Assist
Inoperative Inoperative Blind Spot Assist is faulty.
The yellow
0063indicator lamps also light up in the exterior mirrors.
X Visit a qualified specialist workshop. Parking Pilot Can‐ Parking Pilot Can‐
celed celed The driver's door is open and the driver's seat belt has not been fas-
tened.
X Repeat the parking process with the seat belt fastened and the
driver's door closed. You have inadvertently touched the multifunction steering wheel while
steering intervention was active.
X While steering intervention is active, make sure that the multifunc-
tion steering wheel is not touched unintentionally. The vehicle has started to skid and ESP
®
has intervened.
X Use Parking Pilot again later (Y page 142).Parking Pilot Inop‐
Parking Pilot Inop‐
erative erative You have just carried out a large number of turning or parking maneu-
vers.
Parking Pilot will become available again after approximately ten
minutes (Y page 142).
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Switch off the drive system and start it again.
If the multifunction display still shows the display message: X Visit a qualified specialist workshop. Parking Assist PARKTRONIC is malfunctioning.
X Visit a qualified specialist workshop. Display
messages
183On-board computer and displays Z

Always switch off the windshield wipers and
the ignition before cleaning the windshield or wiper blades.
! Only fold the windshield wipers away from
the windshield when vertical. Otherwise, you
will damage the hood.
! Do not use dry cloths, abrasive products,
solvents or cleaning agents containing sol-
vents to clean the inside of the windows. Do
not touch the insides of the windows with
hard objects, e.g. an ice scraper or ring. There is otherwise a risk of damaging the windows.
! Clean the water drainage channels of the
windshield and the rear window at regular
intervals. Deposits such as leaves, petals and
pollen may under certain circumstances pre-
vent water from draining away. This can lead
to corrosion damage and damage to elec-
tronic components.
X Clean the inside and outside of the windows
with a damp cloth and a cleaning product that is recommended and approved by Mercedes-
Benz.
Cleaning wiper blades G
WARNING
You could become trapped by the windshield wipers if they start moving while cleaning the
windshield or wiper blades. There is a risk of
injury.
Always switch off the windshield wipers and
the ignition before cleaning the windshield or
wiper blades.
! Only fold the windshield wipers away from
the windshield when vertical. Otherwise, you
will damage the hood.
! Do not pull the wiper blade. Otherwise, the
wiper blade could be damaged.
! Do not clean wiper blades too often and do
not rub them too hard. Otherwise, the graph- ite coating could be damaged. This could
cause wiper noise.
! Hold the wiper arm securely when folding
back. The windshield could be damaged if the wiper arm smacks against it suddenly. X
Fold the windshield wiper arms away from the
windshield.
X Carefully clean the wiper blades with a damp
cloth.
X Fold the windshield wiper arms back again
before switching on the ignition.
Cleaning the exterior lighting !
Only use cleaning agents or cleaning cloths
which are suitable for plastic light lenses.
Unsuitable cleaning agents or cleaning cloths
could scratch or damage the plastic light len- ses.
X Clean the plastic lenses of the exterior lights
with a wet sponge and a mild cleaning agent,
e.g. Mercedes-Benz car shampoo or cleaning
cloths.
Cleaning the mirror turn signals !
Only use cleaning agents or cleaning cloths
that are suitable for plastic lenses. Unsuitable
cleaning agents or cleaning cloths could
scratch or damage the plastic lenses of the
mirror turn signals.
X Clean the plastic lenses of the mirror turn sig-
nals in the exterior mirror housing using a wet sponge and mild cleaning agent, e.g.
Mercedes-Benz car shampoo or cleaning
cloths.
Cleaning the sensors !
If you clean the sensors with a power
washer, make sure that you keep a distance
of at least 11.8 in (30 cm) between the vehicle
and the power washer nozzle. Information
about the correct distance is available from
the equipment manufacturer. Care
237Maintenance and care Z

the information on display messages
(Y page 185).
It may take up to ten minutes for a malfunction of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after a few minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at a gas station with a pressure gauge. The
tire pressures shown by the on-board computer refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a
pressure gauge are higher than those shown by the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interference from radio transmit-
ting equipment (e.g. radio headphones, two-way radios) that may be being operated in or near the vehicle.
Checking the tire pressure electroni-
cally X
Make sure that the SmartKey is in position 2
in the ignition lock (Y page 109).
X Press 0059or0065 on the steering wheel to
select the Serv. Serv.menu.
X Press the 0063or0064 button to select
Tire Pressure
Tire Pressure.
X Press the 0076button.
The current tire pressure of each tire is shown
in the multifunction display.
If the vehicle was parked for longer than
20 minute s,the Tire pressure will be Tire pressure will be
displayed after driving a few minutes
displayed after driving a few minutes
message is shown.
After a teach-in process, the tire pressure mon- itor automatically detects new wheels or new
sensors. As long as a clear allocation of the tire
pressure value to the individual wheels is not
possible, the Tire TirePressure
Pressure Monitor
Monitor Active
Active
message is shown instead of the tire pressure
display. The tire pressures are already being
monitored. Tire pressure monitor warning mes-
sages If the tire pressure monitor detects a pressure
loss in one or more tires, a warning message is
shown in the multifunction display. The yellow
tire pressure warning lamp then lights up.
R If the Please Correct Tire Pressure Please Correct Tire Pressure
message appears in the multifunction display, the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunity arises.
R If the Check Tire Pressure
Check Tire Pressure message
appears in the multifunction display, the tire
pressure in one or more tires has dropped
significantly. The tires must be checked.
R If the Tire Tire Pressure
Pressure Warning
WarningTire
TireFail‐
Fail‐
ure
ure message appears, the tire pressure in one
or more tires has dropped suddenly. The tires
must be checked.
Observe the instructions and safety notes in the display messages in the "Tires" section
(Y page 185).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displayed for the
wrong positions for a short time. This is rectified after a few minutes of driving, and the tire pres-
sures are displayed for the correct positions.
Restarting the tire pressure monitor When you restart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the cur-
rently set tire pressures as the reference values for monitoring. In most cases, the tire pressure
monitor will automatically detect the new refer-
ence values after you have changed the tire
pressure. However, you can also set reference
values manually as described here. The tire
pressure monitor then monitors the new tire
pressure values.
X Set the tire pressure to the value recommen-
ded for the corresponding driving situation on
the Tire and Loading Information placard on
the driver's side B-pillar (Y page 260).
Additional tire pressure for various operating
conditions can be found in the tire pressure
table in the charge socket flap (Y page 124).
X Make sure that the tire pressure is correct on
all four wheels.
X Make sure that the SmartKey is in position 2
in the ignition lock (Y page 109). Tire pressure
265Wheels and tires Z