2016 MERCEDES-BENZ B-Class ELECTRIC warning light

Display messagesPossible causes/consequences andMSolutions
Radar Sensors
Dirty See Opera‐
tor's Manual
COLLISION PREVENTION ASSIST PLUS is temporarily restricted or
inoperative.
Possible causes are:
Rthe sensors in the radiator trim and/or in the bumpers are dirty
Rthe function of COLLISION PREVENTION ASSIST PLUS is
impaired due to heavy rain or snow.
A warning tone also sounds.
When the causes stated above no longer apply, the display mes-
sage disappears. COLLISION PREVENTION ASSIST PLUS is opera-
tional again.
If th e display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecur eth e vehicle against rolling away (Ypage 153).
XSwitc h offthe drive system.
XClean the sensors in the following location s(Ypage 277):
Rin the radiatortrim
Rin thefront bumper
Rin the rear bumper, particularly in the middle of the rear
bumper
XStart th e drive system again.
The display message disappears.
ã
Acoustic Vehicle
Indication Inoper‐
ative
The sound generator is not working. The vehicle can still be driven;
however, no vehicle sounds can be generated. As a result, your
vehicle may not be heard by other road users until it is very close
to them, or it may not be heard at all.
XDrive with particular care, allowing for the possibility that other
road users may behave unpredictably.
XVisit a qualified specialist workshop.
6
SRS Malfunction
Service Required
The restraint system is faulty. The 6warning lamp also lights
up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
Fo r further information about the restraint system, see
(
Ypage 40).
210Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
6
FrontLeftMalfunc‐
tion Service
RequiredorFront
Right Malfunction
Service Required
The restraint system has malfunctioned at the front on the left or
right. The 6warning lamp also lights up in the instrument clus-
ter.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
6
Rear Left Malfunc‐
tion Service
Requiredor Rear
Right Malfunction
Service Required
The rear left-hand or right-hand restraint system has malfunc-
tioned. The 6warning lamp also lights up in the instrument
cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
6
Rear Center Mal‐
function Service
Required
The rear center restraint system has malfunctioned. The 6
warning lamp also lights up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
6
Left Side Curtain
AirbagMalfunction
Service Required
or Right Side Cur‐
tain Airbag Mal‐
function Service
Required
There is a malfunction in the left-hand or right-hand window cur-
tain air bag. The 6warning lamp also lights up in the instrument
cluster.
GWARNING
The left or right window curtain air bag may either be triggered
unintentionally or, in the event of an accident, may not be trig-
gered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
Display messages21 1
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Front Passenger
Airbag Disabled
SeeOperator'sMan‐
ual
The front-passenger air bag is deactivated during the journey, even
though:
Ran adult
or
Ra person of the corresponding stature is on the front-passenger
seat
If additional forces are applied to the seat, the system may inter-
pret the occupant's weight as lower than it actually is.
GWARNING
The front-passenger air bag does not deploy during an accident.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecur eth e vehicle against rolling away (Ypage 153).
XSwitc hth e ignition off.
XHave the occupant get out of the vehicle.
XKeep the seat unoccupied, close the front-passenger door and
switch on the ignition.
XObserve thePASSENGER AI RBA G indicator lamps in the center
console and th e multifunction display and check the following:
Seat unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFF
and PASSENGER AI RBA G ON indicator lamps must light up
simultaneously for approximately six seconds
Rth ePASSENGER AI RBA G OFF indicator lamp must then light
up and remain lit after the self-diagnosis. If the indicator lamp
is on, OCS (Occupant Classification System) has disabled the
front-passenger front air bag (
Ypage 50)
Rth eFront Passenger Air Bag Enabled See Opera‐
tor's Manualor Front Passenger Air Bag Disabled
See Operator's Manualdisplay messages must not be
shown in the multifunction display
XWait fo raperiod of at least 60 seconds until the necessary sys-
te m checks have been completed.
XMake sure that the display messages do not appear in the mul-
tifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIRBA G OFF or ON
indicator lamp remains lit or goes out depends on how OCS clas-
sifies the occupant.
212Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
If the conditions are not fulfilled, the system is not operating cor-
rectly.
XVisit a qualified specialist workshop immediately.
Fo r further information about the Occupant Classification System,
see (
Ypage 50).
Front Passenger
AirbagEnabledSee
Operator's Manual
The front-passenger air bag is enabled during the journey, even
though:
Ra child, a small adult or an object weighing less than the sys-
tem' s weight threshold is located on the front-passenger seat
or
Rth e front-passenger seat is unoccupied
The system may detect objects or forces applying additional
weight on the seat.
GWARNING
The air bag may deploy unintentionally.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecur eth e vehicle against rolling away (Ypage 153).
XSwitc hth e ignition off.
XOpen the front-passenger door.
XRemove th e child and the child restraint system from the front-
passenger seat.
XMake sure that there are no objects on the seat adding to the
weight.
The system may otherwise detect the additional weight and
interpret the seat occupant's weight as greater than it actually
is.
XKeep the seat unoccupied, close the front-passenger door and
switch on the ignition.
XObserve thePASSENGER AI RBA G indicator lamps in the center
console and th e multifunction display and check the following:
Se at unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFF
and PASSENGER AI RBA G ON indicator lamps must light up
simultaneously for approximately six seconds
Rth ePASSENGER AI RBA G OFF indicator lamp must then light
up and remain lit after the self-diagnosis. If the indicator lamp
Display messages21 3
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
b
Active Headlamps
Inoperative
The active light function is faulty.
XVisit a qualified specialist workshop.
b
Malfunction See
Operator's Manual
The exterior lighting is defective.
XVisit a qualified specialist workshop.
b
AutoLampFunction
Inoperative
The light sensor is defective.
XVisit a qualified specialist workshop.
b
Switch Off Lights
The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
XTurn the light switch to the Ãposition.
b
SwitchOnHeadlamps
You are driving with low-beam headlamps switched off.
XTurnthe light switch to the Lorà position.
Display messages217
On-board computer and displays
Z

Driving systems
Display messagesPossible causes/consequences andMSolutions
À
Attention Assist:
TakeaBreak!
Based on certain criteria, ATTENTION ASSIST has detected fatigue
or a lack of concentration on the part of the driver .Awarningtone
also sounds.
XIf necessary, take a break.
Durin g long journeys, take regular breaks in good time so you get
enough rest.
À
Attention Assist
Inoperative
ATTENTION ASSIST is inoperative.
XVisit a qualified specialist workshop.
ë
Off
The HOLD function is deactivated. The vehicle is skidding.
A warning tone also sounds.
XReactivate the HOLD function later (Ypage 163).
The HOLD function is deactivated. When the brake pedal is firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.
XCheck the activation conditions forth eHOLD function
(
Ypage 163).
Blind Spot Assist
Currently Unavail‐
able See Opera‐
tor's Manual
Blin d Spot Assist is temporarily inoperative.
Possible causes are:
Rth e radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tion s or other sources of electromagnetic radiation.
Rthe radar sensor system is outside the operating temperature
range.
The yellow 9indicator lamps also light up in the exterior mir-
rors .
When the causes stated above no longer apply, the display mes-
sage disappears.
Blin d Spot Assist is operational again.
If th e display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecur eth e vehicle against rolling away (Ypage 153).
XStart th e drive system again.
220Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Blind Spot Assist
Inoperative
Blind Spot Assist is defective.
The yellow9indicator lamps also light up in the exterior mir-
rors.
XVisit a qualified specialist workshop.
Park Assist Can‐
celed
The driver's door is open and the driver's seat belt has not been
fastened.
XRepeat 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.
XWhile steering intervention is active, make sure that the multi-
function steering wheel is not touched unintentionally.
The vehicle has started to skid and ESP®has intervened.
XUse Active Parking Assist again later (Ypage 168).
ParkAssistInoper‐
ative
You have just carried out a large number of turning or parking
maneuvers.
Active Parking Assist will become available again after approx-
imately ten minute s(
Ypage 168).
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSwitch offthe drive system and start it again.
If th e multifunction display still shows the display message:
XVisit a qualified specialist workshop.
PARKTRONIC is defective.
XVisit a qualified specialist workshop.
Park Assist Fin‐
ished
The vehicle is parked. A warning tone also sounds.
The display message disappears automatically.
Display messages221
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Â
Key Not Detected
(white display mes-
sage)
The SmartKey is currently undetected.
XChange the location of theSmartKey in the vehicle.
If th e SmartKey still cannot be detected:
XOperate the vehicle with theSmartKey in th e ignition lock.
Â
Remove'Start'But‐
ton and Insert Key
The SmartKey is continually undetected.
KEYLESS-GO is temporarily malfunctioning or is defective. A warn-
ing tone also sounds.
XInserttheSmartKey into th e ignition lock and turn it to the
desired position.
XVisit a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
General notes
Some systems carry out a self-diagnosis when the ignition is switched on. Therefore, some
indicator and warning lamps may light up or flash temporarily. This behavior is non-critical.
These warning and indicator lamps only indicate a malfunction if they light up or flash after the
drive system is started or during a journey.
Safety
Seat belts
ProblemPossible causes/consequences and MSolutions
ü
After starting thedrive
system, the red seat
belt warning lamp lights
up for6 seconds.The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
XFasten your seat belt (Ypage 44).
ü
After starting thedrive
system, the red seat
belt warning lamp lights
up. In addition ,awarn-
ing tone sounds for up
to 6 seconds.The driver's seat belt is not fastened.
XFasten your seat belt (Ypage 44).
The warning tone ceases.
Warning and indicator lamps in the instrument cluster229
On-board computer and displays
Z