2016 MERCEDES-BENZ B-Class ELECTRIC ECU

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
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

Drive system
Display messagesPossible causes/consequences andMSolutions
+
Check Coolant See
Operator's Manual
The coolant level is too low.
!Avoid making long journeys withtoo little coolant in the cooling
system. The drive system will otherwise be damaged.
XIf th e coolant needs topping up more often than usual, have the
cooling system checked at a qualified specialist workshop.
#
SeeOperator'sMan‐
ual
The 12 V battery is no longer being charged.
XStop th e vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the drive system.
XSecur eth e vehicle against rolling away (Ypage 153).
XDo no t drive on.
XDo notto w the vehicle.
XConsult a qualified specialist workshop.
#
Stop Vehicle See
Operator's Manual
The 12 V battery is no longer being charged and the battery charge
level is too low.
A warning tone also sounds.
XStop th e vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the drive system.
XSecur eth e vehicle against rolling away (Ypage 153).
XDo no t drive on.
XDo notto w the vehicle.
XConsult a qualified specialist workshop.
218Display messages
On-board computer and displays

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

Tires
Display messagesPossible causes/consequences andMSolutions
Please Correct
Tire Pressure
The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
XCheck the tire pressures at the next opportunity (Ypage 309).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 311).
Check TiresThe tire pressure in one or more tires has dropped significantly.
The wheel position appears in the multifunction display.
A warning tone also sounds.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed
increase.
Rthey may wear excessively and/or unevenly, which may greatly
impair tire traction.
Rthe driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 153).
XCheck the tires and, if necessary, follow the instructions for a
flat tire (
Ypage 282).
XCheck the tire pressure (Ypage 309).
XIf necessary, correct the tire pressure.
Display messages22 3
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Warning Tire Mal‐
function
The tire pressure in one or more tires has dropped suddenly. The
wheel position appears in the multifunction display.
GWARNING
Driving withaflat tire poses a risk of the following hazards:
Raflat tire affects th e ability to steer or brake the vehicle.
Ryou could lose control of the vehicle.
Rcontinued driving withaflat tire will cause excessive heat build-
up and possibl yafire.
There is a risk of an accident.
XStop th e vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
XSecur eth e vehicle against rolling away (Ypage 153).
XCheck thetires and , if necessary, follow the instructions fora
flat tire (
Ypage 282).
Tire Press. Moni‐
tor Currently
Unavailable
Because there is interferenc efrom a strong source of radio waves,
no signals from the tire pressure sensors are detected. The tire
pressure monitor is temporarily malfunctioning.
XDrive on.
The tire pressure monitor restarts automatically as soon as the
problem has been resolved.
TirePress. Sen‐
sor(s) Missing
There is no signal from the tire pressure sensor of one or several
wheels. The pressure of the affected tire does not appear in the
multifunction display.
XHave the faulty tire pressure sensor replaced at a qualified spe-
cialist workshop.
Tire Pressure Mon‐
itor Inoperative
No Wheel Sensors
The wheels mounted do not haveasuitable tire pressure sensor.
The tire pressure monitor is deactivated.
XMount wheels with suitable tire pressure sensors.
The tire pressure monitor is activated automatically after driving
fo rafew minutes.
Tire Press. Moni‐
tor Inoperative
The tire pressure monitor is faulty.
XVisit a qualified specialist workshop.
224Display messages
On-board computer and displays

Vehicle
Display messagesPossible causes/consequences andMSolutions
Depress Brake to
Start Engine
You have attempted to start the drive system with the transmis-
sion in positionNwithout depressing the brake pedal.
XDepress the brake pedal.
To Deselect P or
N, Depress Brake
and Start Engine
You have attempted to shift the transmission to position Ror D
without starting the drive system.
XStart the drive system.
XDepress the brake pedal.
iIt is only possible to shift the transmission from position Pto
the desired position if you depress the brake pedal. Only then
can the parking lock be deactivated. If you do not depress the
brake pedal, the DIRECT SELECT lever can still be moved but the parking lock remains engaged.
iAt transmission fluid temperatures below Ò4‡( Ò20 †) you can
only shift out of position Pinto another transmission position
when the engine is running.
Apply Brake to
Shift from 'P'
You have attempted to shift the transmission to position R,Nor D
without depressing the brake pedal.
XDepress the brake pedal.
Transmission Not
in P Risk of Vehi‐
cle Rolling Away
The driver's door is open or not fully closed and the transmission
is in position R,Nor D.
A warning tone also sounds.
GWARNING
The vehicle may roll away.
There is a risk of an accident.
XShift the transmission to position P.
XSecure the vehicle against rolling away (Ypage 153).
XClose the driver's door completely.
Display messages225
On-board computer and displays
Z