2016 MERCEDES-BENZ B-Class ELECTRIC ECU

Safety systems
Display messagesPossible causes/consequences andMSolutions
!÷
Currently Unavail‐
able See Opera‐
tor's Manual
ABS (Anti-lock Braking System), BAS (Brake Assist), ESP®(Elec-
tronic Stability Program), the HOLD function, RBS (Recuperative
Brake System) and hill start assist are temporarily unavailable.
COLLISION PREVENTION ASSIST PLUS may also have failed.
The !, ÷,åandé (USA only) or J(Canada only)
warning lamps in the instrument cluster may also light up.
ATTENTION ASSIST is deactivated.
Possible causes are:
RSelf-diagnosis is not yet complete.
RThe on-board voltage may be insufficient.
GWARNING
The braking performance of the electric motor using recuperative
braking may be either reduced or not effective. 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 regen-
erative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP
®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XCarefully drive a short distance on a suitable stretch of road,
making slight steering movements at a speed above 12 mph
(20 km/ h).
If the display message disappears, the functions mentioned
above are available again.
If the multifunction display still shows the display message:
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
!÷
Inoperative See
Operator's Manual
ABS, BAS, ESP®, the HOLD function, RBS and hill start assist are
not available due to a malfunction.
COLLISION PREVENTION ASSIST PLUS may also have failed.
The !, ÷,å, é(USA only) or J(Canada only) and
$ (USA only) or J(Canada only) warning lamps in the
instrument cluster may also light up.
Display messages201
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
ATTENTION ASSIST is deactivated.
GWARNING
The braking performance of the electric motor using recuperative
braking may be either reduced or not effective. If you do not make
an additional effort to apply the brake yourself, the braking effect
may no t be sufficient. If necessary, counteract the reduced regen-
erative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ES P
®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
202Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
÷
Currently Unavail‐
able See Opera‐
tor's Manual
ESP®,BAS, th eHOLD function, RBS and hill start assist are tem-
porarily unavailable.
COLLISION PREVENTION ASSIST PLUS may also have failed.
The , ÷, åandé (USA only) or J(Canada only)
warning lamps in the instrument cluster may also light up.
ATTENTION ASSIST is deactivated.
The self-diagnosis function might not be complete, for example.
GWARNING
The braking performance of the electric motor using recuperative
braking may be either reduced or not effective. If you do not make
an additional effort to apply the brake yourself, the braking effect
may no t be sufficient. If necessary, counteract the reduced regen-
erative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
increase.
If ES P
®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XCarefully drivea suitable distance, making slight steering move-
ments at a speed above 12 mph (20 km/h).
If th e display message disappears, the functions mentioned
above are available again.
If th emu ltifunction display still shows the display message:
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
Display messages203
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
÷
Inoperative See
Operator's Manual
ESP®,BAS, th eHOLD function, RBS and hill start assist are not
available due to a malfunction.
COLLISION PREVENTION ASSIST PLUS may also have failed.
The , ÷, åandé (USA only) or J(Canada only)
warning lamps in the instrument cluster may also light up.
ATTENTION ASSIST is deactivated.
GWARNING
The braking performance of the electric motor using recuperative
braking may be either reduced or not effective. If you do not make
an additional effort to apply the brake yourself, the braking effect
may no t be sufficient. If necessary, counteract the reduced regen-
erative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
increase.
If ES P
®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
204Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
T!
÷
Inoperative See
Operator's Manual
EBD (electronic brake force distribution), ABS, BAS, ESP®,th e
HOLD function , RBS and hill start assist are not available due to a
malfunction.
COLLISION PREVENTION ASSIST PLUS may also have failed.
A warning tone sounds.
The ÷, å,!andé (USA only) or J(Canada only)
warning lamps in the instrument cluster may also light up.
GWARNING
The braking performance of the electric motor using recuperative
braking may be either reduced or not effective. If you do not make
an additional effort to apply the brake yourself, the braking effect
may no t be sufficient. If necessary, counteract the reduced regen-
erative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ES P
®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
F(USA
only)
!(Canada
only)
Turn On the Igni‐
tion to Release
the Parking Brake
The red F(USA only) or !(Canada only) indicator lamp
lights up.
You attempted to release the electric parking brake while the igni-
tion was switched off.
XSmartKey: turnthe SmartKey to position 1in the ignition lock.
XKEYLESS-GO: switch on the ignition.
F(USA
only)
!(Canada
only)
Please Release
Parking Brake
The red F(USA only) or !(Canada only) indicator lamp
flashes and a warning tone sounds. A condition for automatic
release of the electric parking brake is not fulfilled (
Ypage 155).
You are driving with the electric parking brake applied.
XRelease the electric parking brake manually.
The red F(USA only) or !(Canada only) indicator lamp
flashes and a warning tone sounds.
You are using the electric parking brake foremergenc y braking
(
Ypage 155).
Display messages20 5
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
F(USA
only)
!(Canada
only)
Parking Brake See
Operator's Manual
The yellow !warning lamp lights up.
The electric parking brake is malfunctioning.
To apply:
XSwitc hth e ignition off.
XPress the electric parking brake handle for at least ten seconds.
XShift th e transmission to position P.
XConsult a qualified specialist workshop.
The yellow!warning lamp and the red F(USA only)
or ! (Canada only) indicator lamp light up.
The electric parking brake is malfunctioning.
To release:
XSwitc h offthe ignition and turn it back on.
XRelease the electric parking brake manually.
or
XRelease the electric parking brake automatically (Ypage 155).
If th e electric parking brake still cannot be released:
XDo no t drive on.
XConsult a qualified specialist workshop.
The red F(USA only) or !(Canada only) indicator lamp
flashes and the yellow !warning lamp lights up.
The electric parking brake is malfunctioning.
To release:
XSwitc h offthe ignition and turn it back on.
XRelease the electric parking brake manually.
To apply:
XSwitc h offthe ignition and turn it back on.
XApply the electric parking brake manually.
If th e red F (USA only) or !(Canada only) indicator lamp
continues to flash:
XDo no t drive on.
XSecureth e vehicle against rolling away (Ypage 324).
XShift th e transmission to position P.
XTurnthefron t wheels towards the curb.
XConsult a qualified specialist workshop.
206Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
F(USA
only)
!(Canada
only)
Parking
BrakeInop‐
erative
The yellow !warning lamp lights up. The red F(USA only)
or ! (Canada only) indicator lamp flashes for about ten sec-
onds after the electric parking brake has been applied or released.
It then goes out or remains lit.
The electric parking brake is malfunctioning, e.g. because of over-
voltage or undervoltage.
XRectify the cause of the overvoltage or undervoltage, e.g. by
chargin gth ebattery or restarting the drive system.
XEngage or release the electric parking brake.
If it remains impossible to apply or release the electric parking
brake:
XSwitc h offthe ignition and turn it back on.
XEngage or release the electric parking brake.
If th e electric parking brake still cannot be released:
XConsult a qualified specialist workshop.
If th e electric parking brake still cannot be applied:
XVisit a qualified specialist workshop.
The yellow !warning lamp lights up and the red F(USA
only) or !(Canada only) indicator lamp flashes.
It is no t possible to apply the electric parking brake manually.
XShift th e transmission to position P.
XVisit a qualified specialist workshop.
$(USA
only)
J(Canada
only)
Check Brake Fluid
Level
There is not enough brake fluid in the brake fluid reservoir.
A warning tone sounds. The $(USA only) or J(Canada
only) warning lamps in the instrument cluster may also light up.
GWARNING
The braking effect may be impaired.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
XSecur eth e vehicle against rolling away (Ypage 153).
XConsult a qualified specialist workshop.
XDo no t add brake fluid. This does not correctth e malfunction.
208Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
#
Check Brake Pad
Wear
The brake pads/linings have reached their wear limit.
XVisit a qualified specialist workshop.
G
Inoperative
One or more main features of the mbrace system are malfunc-
tioning.
XVisit a qualified specialist workshop.
Collision Preven‐
tion Assist Plus
Currently Unavail‐
able See Opera‐
tor's Manual
COLLISION PREVENTION ASSIST PLUS is temporarily not opera-
tional.
Possible causes are:
Rthe 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 system is outside the operating temperature range.
Rthe on-board voltage is too low.
When the causes stated above no longer apply, the display mes-
sage disappears.
COLLISION PREVENTION ASSIST PLUS 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.
Collision Preven‐
tion Assist Plus
Inoperative
COLLISION PREVENTION ASSIST PLUS is temporarily inoperative
due to a malfunction. Adaptive Brake Assist may also have failed.
XVisit a qualified specialist workshop immediately.
Display messages20 9
On-board computer and displays
Z