2017 MERCEDES-BENZ B-Class Owner's Manual

Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00E9
0051
The red seat belt warning lamp lights up after the drive system starts, as soon
as the driver's or the front-passenger door is closed.
The driver or front passenger has not fastened their seat belt.
X Fasten your seat belt (Y page 42).
The warning lamp goes out.
There are objects on the front-passenger seat.
X Remove the objects from the front-passenger seat and stow them in a secure
place.
The warning lamp goes out. 00E9
0051
The red seat belt warning lamp flashes and an intermittent audible warning
sounds.
The driver or front passenger has not fastened their seat belt. The vehicle is being driven faster than 15 mph (25 km/h) or has briefly been driven faster than 15 mph
(25 km/h).
X Fasten your seat belt (Y page 42).
The warning lamp goes out and the intermittent warning tone ceases.
There are objects on the front-passenger seat. The vehicle is being driven faster
than 15 mph (25 km/h) or has briefly been driven faster than 15 mph (25 km/h). X Remove the objects from the front-passenger seat and stow them in a secure
place.
The warning lamp goes out and the intermittent warning tone ceases. Warning and indicator lamps in the instrument cluster
191On-board computer and displays Z

Safety systems
Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00C6004D
0051
The yellow brake system warning lamp is lit while the drive system is running.
00C6 (USA only) 004D(Canada only): the yellow RBS/brake system warning lamp
is lit while the drive system is running.
The brake system is malfunctioning.
G WARNING
The braking characteristics may be affected.
There is a risk of an accident.
X Drive on taking extra care.
X Visit a qualified specialist workshop immediately. 00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow RBS/brake system warning
lamp is lit while the drive system is running.
RBS (Recuperative Brake System) is unavailable due to a malfunction.
G WARNING
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 regenerative braking effect by applying the brake yourself.
The brake system continues to function normally, but without the function listed
above.
The braking effect may be impaired.
X Drive on taking extra care.
X Visit a qualified specialist workshop immediately. 0027004D
0051
0027 (USA only), 004D(Canada only): the red brake system warning lamp is lit
while the drive system is running. A warning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is a risk of an accident.
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 Secure the vehicle against rolling away (Y page 128).
X Consult a qualified specialist workshop.
X Observe the additional display messages in the multifunction display. 192
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 0027004D
0051
0027 (USA only), 004D(Canada only): the red brake system warning lamp is lit
while the drive system is running. A warning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
G WARNING
The braking effect may be impaired.
There is a risk of an accident.
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 Secure the vehicle against rolling away (Y page 128).
X Do not add brake fluid. Adding more will not correct the malfunction.
X Consult a qualified specialist workshop.
X Observe the additional display messages in the multifunction display. 0025
00E500BB
00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow ABS, ESP ®
, ESP ®
OFF and
RBS/brake system warning lamps are lit while the drive system is running.
ABS (Anti-lock Braking System) is deactivated due to a malfunction. BAS (Brake
Assist), Active Brake Assist, ESP ®
(Electronic Stability Program), RBS, the HOLD
function and hill start assist are also deactivated, for example.
ATTENTION ASSIST is deactivated.
G WARNING
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 regenerative 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 affected. 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.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately.
If the ABS control unit is malfunctioning, other systems may also not be available, e.g. the navigation system. Warning and indicator lamps in the instrument cluster
193On-board computer and displays Z

Warning/
indicator
lamp
0051
0051 Signal type
Possible causes/consequences and 0050 0050Solutions 0025
00E500BB
00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow ABS, ESP ®
, ESP ®
OFF and
RBS/brake system warning lamps are lit while the drive system is running.
ABS is temporarily unavailable. BAS, Active Brake Assist, ESP ®
, EBD (Electronic
Brake-force Distribution), the HOLD function and hill start assist are also deacti-
vated, for example.
Possible causes are:
R Self-diagnosis is not yet complete.
R The on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
G WARNING
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 regenerative 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 exam- ple.
The steerability and braking characteristics may be severely affected. The braking
distance in an emergency braking situation can increase.
If ESP ®
is not operational, ESP ®
is unable to stabilize the vehicle.
There is a risk of an accident.
X Carefully drive a suitable distance, making slight steering movements at a speed
above 12 mph (20 km/h).
The functions mentioned above are available again when the warning lamp goes
out.
If the warning lamp is still on: X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 194
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 0025
00E500BB
00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow ABS, ESP ®
, ESP ®
OFF and
RBS/brake system warning lamps are lit while the drive system is running.
EBD is malfunctioning. Therefore, ABS, BAS, Active Brake Assist, ESP ®
, RBS, the
HOLD function and hill start assist, for example, are also unavailable.
ATTENTION ASSIST is deactivated.
G WARNING
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 regenerative 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 exam- ple.
The steerability and braking characteristics may be severely affected. 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.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 0025
00E500BB
0027004D
0051
0027 (USA only), 004D(Canada only): the red brake system warning lamp and
the yellow ABS, ESP ®
and ESP ®
OFF warning lamps are lit while the drive system
is running.
ABS and ESP ®
are malfunctioning. BAS, RBS, Active Brake Assist, EBD, the HOLD
function and hill start assist, for example, are also unavailable.
ATTENTION ASSIST is deactivated.
G WARNING
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 regenerative 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 exam- ple.
The steerability and braking characteristics may be severely affected. 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.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. Warning and indicator lamps in the instrument cluster
195On-board computer and displays Z

Warning/
indicator
lamp
0051
0051 Signal type
Possible causes/consequences and 0050 0050Solutions 00E5
0051
The yellow ESP ®
warning lamp flashes while the vehicle is in motion.
ESP ®
or traction control has intervened because there is a risk of skidding or at
least one wheel has started to spin.
Cruise control is deactivated.
X When pulling away, only depress the accelerator pedal as far as necessary.
X Ease off the accelerator pedal while the vehicle is in motion.
X Adapt your driving style to suit the road and weather conditions.
X Do not deactivate ESP ®
.
In rare cases (Y page 63) , it may be best to deactivate ESP ®
.
Observe the important safety notes on ESP ®
(Y page 62). 00BB
0051
The yellow ESP ®
OFF warning lamp is lit while the drive system is running.
ESP ®
is deactivated. ESP ®
will not stabilize the vehicle if it starts to skid or if a
wheel starts to spin.
G WARNING
If ESP ®
is switched off, ESP ®
is unable to stabilize the vehicle.
Further driving systems or driving safety systems are thus restricted.
There is an increased risk of skidding and an accident.
X Reactivate ESP ®
.
In rare cases (Y page 63) , it may be best to deactivate ESP ®
.
Observe the important safety notes on ESP ®
(Y page 62).
X Adapt your driving style to suit the road and weather conditions.
If ESP ®
cannot be activated:
X Drive on carefully.
X Contact a qualified specialist workshop and have ESP ®
checked. 196
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00E500BB
00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow ESP ®
, ESP ®
OFF and RBS/
brake system warning lamps are lit while the drive system is running.
ESP ®
, RBS, BAS, Active Brake Assist, the HOLD function and hill start assist are
unavailable due to a malfunction.
ATTENTION ASSIST is deactivated.
G WARNING
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 regenerative 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 ESP ®
is not operational, ESP ®
is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. Warning and indicator lamps in the instrument cluster
197On-board computer and displays Z

Warning/
indicator
lamp
0051
0051 Signal type
Possible causes/consequences and 0050 0050Solutions 00E500BB
00C6004D
0051
00C6 (USA only), 004D(Canada only): the yellow ESP ®
, ESP ®
OFF and RBS/
brake system warning lamps are lit while the drive system is running.
ESP ®
, BAS, the HOLD function and hill start assist are temporarily unavailable.
Adaptive Brake Assist may also have failed.
ATTENTION ASSIST is deactivated.
Self-diagnosis is not yet complete.
G WARNING
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 regenerative 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 ESP ®
is not operational, ESP ®
is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Carefully drive a suitable distance, making slight steering movements at a speed
above 12 mph (20 km/h).
The functions mentioned above are available again when the warning lamp goes
out.
If the warning lamp is still on: X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 00240049
0051
0049 (USA only), 0024(Canada only): the red indicator lamp for the electric
parking brake flashes or lights up and/or the yellow warning lamp for the electric
parking brake lights up.
X Observe the additional display messages in the multifunction display. 0075
0051
The red restraint system warning lamp is lit while the drive system is running.
The restraint system is malfunctioning.
G WARNING
The air bags or Emergency Tensioning Devices may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Contact a qualified specialist workshop and have the restraint system checked.
For further information about the restraint system, see (Y page 38).198
Warning and indicator lamps in the instrument clusterOn-board computer and displays