2017 MERCEDES-BENZ CLA Owners Manual

Display messages
Possible causes/consequences and P Solutions

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 indicator and warning lamps only indicate a malfunction if they light up or flash after starting
the engine or whilst driving.
Safety
Seat belts Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions

Safety systems Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
'M
Q ' (USA only), M (Canada only): the red brake system warning lamp is lit
while the engine 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 140).X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction display.
'M
Q ' (USA only), M (Canada only): the red brake system warning lamp is lit
while the engine 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 140).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.Warning and indicator lamps in the instrument cluster 217
On-board computer and displays Z

Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is deactivated due to a malfunction. BAS (Brake
Assist), Active Brake Assist, ESP ®
(Electronic Stability Program), the HOLD func-
tion and hill start assist are also deactivated, for example.
ATTENTION ASSIST is deactivated.
G WARNING
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 faulty, there is also a possibility that other systems, such
as the navigation system or the automatic transmission, will not be available.
%
Q The yellow ABS warning lamp is lit while the engine 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 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.218
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running. A warning tone
also sounds.
EBD is malfunctioning. ABS, BAS, Active Brake Assist, ESP ®
, the HOLD function
and hill start assist, for example, are also unavailable.
ATTENTION ASSIST is deactivated.
G WARNING
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/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions

Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions

Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
$I
Q I (USA only), $ (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.
u
Q The red restraint system warning lamp is lit while the engine 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 39).
Engine Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions