Page 374 of 498
373 Practical hints
What to do if …
Symbol messagesDisplay symbol
Display messages
Possible cause/consequence
Possible solution
#
Low voltage
Switch off
consumers
The battery has insufficient voltage.
Turn off unnecessary electrical con-
sumers.
Visit workshop
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Do not forget that the brake system
requires electrical energy and may be
operating with restricted capability.
Considerably greater brake pedal force is
required and the stopping distance is
increased.
Stop immediately in a safe location or
as soon as it is safe to do so and
check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an
inoperative water pump which may re-
sult in damage to the engine. Notify
an authorized Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest
authorized Mercedes-Benz Center.
Adjust driving to be consistent with
reduced braking responsiveness.
Page 375 of 498
374 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
#
Battery/Alternator
Stop vehicle
The battery is malfunctioning.
The electro-hydraulic brake system re-
quires electrical energy and therefore has
only limited operation. Considerably
greater brake pedal force is required and
the stopping distance is increased.
Stop the vehicle as soon as it is safe
to do so. Adjust driving to be consis-
tent with reduced braking responsive-
ness.
Notify an authorized Mercedes-Benz
Center.
Low voltage
Start engine
The battery has insufficient voltage.
Start the engine (
page 49).
2
Brake wear
Visit workshop
The brake pads have reached their wear
limit.
Have the brake pads replaced as soon
as possible.
!Brake pad thickness must be visually
inspected by a qualified technician at
the intervals specified in the
Maintenance Booklet.
Page 376 of 498
375 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
!
Release parking
brake
You are driving with the parking brake
set.
Release the parking brake
(page 51).
T
Reduced braking power
Depress brake
pedal fully
The electro-hydraulic brake system is in
emergency operation mode. Consider-
ably greater brake pedal force is required
and the stopping distance is increased.
The maximum speed is limited to 55 mph
(90 km/h).
Do not drive any further.
Stop the vehicle in a safe location and
notify an authorized Mercedes-Benz
Center.
Prevent the vehicle from rolling away
by blocking the wheels with wheel
chocks or other sizable objects.
Call for Roadside Assistance.
(USA only);(Canada only)3
Reduced braking power
Start engine
The battery has insufficient voltage and
cannot supply sufficient power to the
electro-hydraulic brake system.
Start the engine.
The message disappears when suffi-
cient voltage is available.
Page 377 of 498
376 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
(USA only);(Canada only)3
Reduced braking power
Visit workshop
The electro-hydraulic brake system is in
emergency operation mode. Consider-
able brake pedal force is required and the
stopping distance is increased.
Continue driving with added caution.
Adjust driving to be consistent with
reduced braking responsiveness.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Service brake
Visit workshop
There are malfunctions, but the
electro-hydraulic brake system is operat-
ing normally.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Brake overheated
Drive on, but with
even greater care
The brake system is overheated due to an
excessive load on the brakes.
Relieve the load on the brake system.
Drive more smoothly and think ahead
to avoid unnecessary braking.
When driving down slopes, shift into a
lower gear to use the engine’s braking
power (
page 183).
Cautiously continue driving so that
the air stream will cool down the
brakes.
Page 378 of 498
377 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
(USA only);(Canada only)3
Brake fluid
Visit workshop
There is insufficient brake fluid in the
reservoir.
Risk of accident! Stop the vehicle in a
safe location and notify an authorized
Mercedes-Benz Center. Do not add
brake fluid! This will not solve the
problem.
Warning!
G
Driving with the messages “Brake fluid Visit
workshop” displayed can result in an acci-
dent. Have your brake system checked im-
mediately.
If there is a malfunction in the
electro-hydraulic brake system, we recom-
mend that the vehicle be transported with
all wheels off the ground using flatbed or ap-
propriate wheel lift/dolly equipment.
A tow bar must be used if circumstances do
not permit the use of the recommended
towing methods and the vehicle requires
towing with all four wheels on the ground.
Towing the vehicle with all four wheels on
the ground is only permissible for distances
up to 30 miles (50 km) and at a speed not to
exceed 30 mph (50 km/h). For more infor-
mation, refer to “Towing the vehicle”
(page 437).
If the electro-hydraulic brake system enters
its emergency operation mode, the driver
must apply significantly greater brake pedal
pressure and depress the pedal much fur-
ther than normal to obtain braking effect. If
necessary, apply full pressure to the brake
pedal. Brakes may only be applied to the
front wheels. Stopping distance is in-
creased!
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.
Page 388 of 498
387 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
.
Active headlamps
currently
unavailable
The Bi-Xenon cornering lamps system is
malfunctioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Active headlamps
malfunction
Drive to workshop
The Bi-Xenon cornering lamps system is
malfunctioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Active headlamps
Substitute bulb on
The active headlamps are malfunctioning.
Another light is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Backup lamp,
left
The left reverse lamp is malfunctioning.
Replace the bulb as soon as possible.
Backup lamp,
right
The right reverse lamp is malfunctioning.
Replace the bulb as soon as possible.
Brake lamp
Drive to workshop
Brake lamp illumination is delayed or
lamp is permanently on.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Brake lamp, left
Substitute bulb on
The left brake lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Brake lamp, right
Substitute bulb on
The right brake lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
3rd brake lamp
The high mounted brake lamp is malfunc-
tioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Page 395 of 498
394 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
H
Caution
Tire defect
One or more tires are deflating.
The respective tire is shown in the
multifunction display.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
If necessary, change the wheel (
page 419).
1
Have the damaged wheel repaired or replaced
at an authorized Mercedes-Benz Center.
1Vehicles with TIREFIT*: Temporarily repair tire using TIREFIT. If tire cannot be temporarily repaired using TIREFIT, contact Roadside Assistance.
Check tires
The tire pressure in one or more tires
is already below the minimum value.
The respective tire is shown in the
multifunction display.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
Check and adjust tire pressure as required.
If necessary, change the wheel (
page 419).
1
Have the damaged wheel repaired or replaced
at an authorized Mercedes-Benz Center.
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.
Page 396 of 498
395 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
H
Please rectify
tire pressure
The pressure is too low in one or
more tires.
Check and correct tire inflation pressure as
required (
page 313).
Tire pressure
Caution, tire defect
One or more tires are deflating.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
If necessary, change the wheel (
page 419).
1
Have the damaged wheel repaired or replaced
at an authorized Mercedes-Benz Center.
1Vehicles with TIREFIT*: Temporarily repair tire using TIREFIT. If tire cannot be temporarily repaired using TIREFIT, contact Roadside Assistance.
Tire pressure
Check tires
The tire pressure in one or more tires
is already below the minimum value.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
Check and adjust tire pressure as required.
If necessary, change the wheel (
page 419).
1
Have the damaged wheel repaired or replaced
at an authorized Mercedes-Benz Center.
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.
