
No warning vibration occurs if:
R
you clearly and actively steer, brake or
accelerate.
R you cut the corner on a sharp bend.
R a driving safety system intervenes, e.g.
ABS, BAS or ESP ®
.
R you
switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time.
Lane-correcting brake application
If you leave your lane under certain
circumstances the vehicle will brake briefly
on one side. This is meant to assist you in
bringing the vehicle back to the original lane.
This function is available in the range between
40 mph and 120 mph (60 km/h to
200 km/h).
A lane-correcting brake application can only
be made after driving over a solid,
recognizable lane marking. Before this, a
warning must be given by means of
intermittent vibration in the steering wheel.
In addition, a lane with lane markings on both
sides must be recognized. The brake
application also slightly reduces vehicle
speed.
If a lane-correcting brake application occurs,
the following, for example, appears in the
multifunction display: i
A further lane-correcting brake
application can only occur after your
vehicle has returned to the original lane. G
WARNING
Active Lane Keeping Assist does not keep
your vehicle in its lane. It is only an aid
designed
to assist driving. It is not a substitute
for attentive driving. In some cases, the lane- correcting brake application is not sufficient
to
bring your vehicle back to the original lane.
In such cases, you must steer the vehicle
yourself to ensure that it does not leave the
lane.
Active Lane Keeping Assist does not detect
road and traffic conditions. Always make sure
that there is sufficient distance to the side for
other traffic or obstacles. In rare cases,
unclear markings or particular structures on
the roadway can be recognized as solid lane
markings. An inappropriate brake application,
e.g. after intentionally driving over a solid lane
marking, may be interrupted at any time by
steering slightly in the opposite direction.
Active Lane Keeping Assist cannot take
weather conditions into account.
You are responsible for the driving at
appropriate speeds, braking in good time, and
steering correctly. Always adapt your driving
style to suit the prevailing road and weather
conditions. Always pay attention to traffic
conditions and your surroundings. Otherwise,
you may fail to recognize dangers in time,
cause an accident and injure yourself and
others.
No lane-correcting brake application occurs
if:
R you clearly and actively steer, brake or
accelerate.
R you cut the corner on a sharp bend.
R you switch on the turn signals.
R a driving safety system intervenes, e.g.
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist.
R you have adopted a sporty driving style with
high cornering speeds or high rates of
acceleration.
R ESP ®
is switched off.
R the transmission is not in position D.
R a loss of tire pressure or a defective tire has
been detected and displayed.368
Driving systems
Driving and parking

Active Lane Keeping Assist does not detect
traffic situations or road users. An
inappropriate brake application may be
interrupted at any time if you:
R
steer slightly in the opposite direction.
R use a turn signal.
R clearly brake or accelerate.
A lane-correcting brake application is
interrupted automatically if:
R a driving safety system intervenes, e.g.
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist.
R lane
markings can no longer be recognized.
Switching on Active Lane Keeping Assist X
Switch on Active Lane Keeping Assist using
the on-board computer (Y page 385).
Symbol : appears in the instrument
cluster.
If your speed exceeds 40 mph (
60 km/h)
and lane markings are detected,
symbol : is shown in green. Active Lane
Keeping Assist is ready for use. Driving systems
369
Driving and parking Z

Safety systems
Display messages Possible causes/consequences and
M Solutions!÷
Currently
Unavailable See
Oper. Manual G
Risk of accident
ABS (Anti-lock Braking System), ESP ®
(Electronic Stability
Program), BAS (Brake Assist), PRE-SAFE ®
, the HOLD function and
hill start assist are temporarily unavailable.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
In addition, the ÷, å and ! warning lamps light up in
the instrument cluster.
The self-diagnosis function might not be complete, for example.
ATTENTION ASSIST 20
is deactivated.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Carefully drive a suitable distance 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 display message continues to be displayed:
X Drive on carefully.
X Visit a qualified specialist workshop. G
Risk of accident
ABS, ESP ®
, BAS, PRE-SAFE ®
, the HOLD function and hill start
assist are temporarily unavailable.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
In addition, the ÷, å and ! warning lamps light up in
the instrument cluster.
For example, the on-board voltage may be insufficient.
ATTENTION ASSIST 20
is deactivated.
The
brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Drive on carefully.
If the display message disappears, the functions mentioned
above are available again. 20
Not available on hybrid vehicles. Display messages
389
On-board computer and displays Z

Display messages Possible causes/consequences and
M SolutionsIf the display message continues to be displayed:
X
Drive on carefully.
X Visit a qualified specialist workshop. !÷
Inoperative See
Oper. Manual G
Risk of accident
ABS, ESP ®
, BAS, PRE-SAFE ®
, the HOLD function and hill start
assist are unavailable due to a malfunction.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
The $ (USA only)/ J (Canada only), ÷, å
and ! warning lamps in the instrument cluster also light up.
The
brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
ATTENTION ASSIST 20
is deactivated.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. ÷
Currently
Unavailable See
Oper. Manual G
Risk of accident
ESP ®
,
BAS, PRE-SAFE ®
, the HOLD function and hill start assist are
temporarily unavailable.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
In addition, the ÷ and å warning lamps light up in the
instrument cluster.
The self-diagnosis function might not be complete, for example.
ATTENTION ASSIST 20
is deactivated.
The brake system continues to function normally, but without the
functions listed above.
X Carefully drive a suitable distance 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 display message continues to be displayed:
X Drive on carefully.
X Visit a qualified specialist workshop. 20
Not available on hybrid vehicles.390
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M SolutionsG
Risk of accident
If the display message is shown and the ÷ warning lamp flashes
at the same time, the Electronic Traction System is deactivated.
Otherwise, the brakes on the drive wheels could overheat.
X Let the brakes cool down until the display message disappears
and the ÷ warning lamp goes out.
The Electronic Traction System is activated again. ÷
Inoperative See
Oper. Manual G
Risk of accident
ESP ®
,
BAS, PRE-SAFE ®
, the HOLD function and hill start assist are
unavailable due to a malfunction.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
In addition, the ÷ and å warning lamps light up in the
instrument cluster.
ATTENTION ASSIST 20
is deactivated.
The brake system continues to function normally, but without the
functions listed above.
X Drive on carefully.
X Visit a qualified specialist workshop. å
System Inoperative G
Risk of accident
ESP ®
,
BAS, PRE-SAFE ®
, the HOLD function and hill start assist are
unavailable due to a malfunction. BAS PLUS and PRE-SAFE ®
Brake
may also have failed. In addition, the ÷ and å warning
lamps light up in the instrument cluster.
ATTENTION ASSIST 20
is deactivated.
X Drive on carefully.
X Visit a qualified specialist workshop. 20
Not available on hybrid vehicles. Display messages
391
On-board computer and displays Z

Display messages Possible causes/consequences and
M SolutionsT!
÷
Inoperative See
Oper. Manual G
Risk of accident
EBD (electronic brake force distribution), ABS, ESP ®
, BAS, PRE-
SAFE ®
,
the HOLD function and hill start assist are unavailable due
to a malfunction.
BAS PLUS and PRE-SAFE ®
Brake may also have failed.
In addition, the ÷, å and ! warning lamps light up in
the instrument cluster and a warning tone sounds.
ATTENTION ASSIST 20
is deactivated.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. #
Check Brake Pad
Wear The brake pads/linings have reached their wear limit.
X
Visit a qualified specialist workshop. F(USA
only)!(Canada
only)
Please Release
Parking Brake The red
F (USA only)/ ! (Canada only) indicator lamp
flashes and a warning tone sounds.
You are driving with the electric parking brake applied.
X Release the electric parking brake.
or
X Pull away carefully ( Y page 324). The red
F (USA only)/ ! (Canada only) indicator lamp
flashes and a warning tone sounds.
You are making an emergency stop using the electric parking
brake ( Y page 324).
X After the emergency stop: release the electric parking brake
lever. 20
Not available on hybrid vehicles.392
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M SolutionsThe red
F (USA only)/ ! (Canada only) indicator lamp
flashes, the yellow F (USA only)/ ! (Canada only) warning
lamp lights up and a warning tone sounds.
The electric parking brake is malfunctioning and the braking effect
is restricted.
While the vehicle is in motion:
X Release the electric parking brake handle.
While the vehicle is stationary:
X Switch off the ignition and turn it back on.
X Release the electric parking brake.
If the display message continues to be displayed:
X Shift the transmission to P.
X Use the folding wheel chock (Y
page 474) from the vehicle tool
kit to secure the vehicle against rolling away.
X Consult a qualified specialist workshop. F(USA
only)!(Canada
only)
Parking Brake See
Oper. Manual The yellow
F (USA only)/ ! (Canada only) warning lamp
lights up. Additionally, the red F (USA only)/ ! (Canada
only) indicator lamp may light up.
The electric parking brake is malfunctioning.
To release:
X Pull the electric parking brake handle.
or
X Pull away carefully.
X Visit a qualified specialist workshop.
To apply:
X Switch off the ignition.
X Pull the electric parking brake lever for at least ten seconds,
until the display message disappears.
If the display message continues to be displayed:
X Shift the transmission to P.
X Use the folding wheel chock (Y
page 474) from the vehicle tool
kit to secure the vehicle against rolling away.
X Consult a qualified specialist workshop. Display messages
393
On-board computer and displays Z

Display messages Possible causes/consequences and
M SolutionsThe red
F (USA only)/ ! (Canada only) indicator lamp lights
up.
The power supply for the electric parking brake was interrupted.
X Pull the electric parking brake handle.
or
X Pull away carefully.
or
X Pull the electric parking brake handle until the display message
disappears. The red
F (USA only)/ ! (Canada only) indicator lamp
flashes and the yellow F (USA only)/ ! (Canada only)
warning lamp lights up.
The electric parking brake is malfunctioning.
X Switch off the ignition and turn it back on.
X Engage or release the electric parking brake.
or
X Pull away carefully.
X Visit a qualified specialist workshop. The yellow
F (USA only)/ ! (Canada only) warning lamp
lights
up. The red F (USA only)/ ! (Canada only) indicator
lamp flashes for approximately 10 seconds 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
overvoltage or undervoltage.
X Pull away carefully.
X Visit a qualified specialist workshop.
If there is overvoltage or undervoltage:
X Remove the cause for the overvoltage or undervoltage, e.g. by
charging the battery or restarting the engine.
X Switch the ignition off and on, and then engage or release the
electric parking brake.
If this does not release the electric parking brake:
X Do not drive on.
X Consult a qualified specialist workshop.394
Display messages
On-board computer and displays