99 Safety and Security
Driving safety systems
The electrohydraulic brake servo assis-
tance switches off automatically
approximately 2 minutes after you
turned the SmartKey in the starter
switch to position0 or removed the
SmartKey
approximately 2 minutes after you
pressed the KEYLESS-GO* start/stop
button to turn off the engine or power
supply and opened the driver’s door
(with driver’s door open, the starter
switch is set to position 0, same as
SmartKey removed from starter
switch)
approximately 20 seconds after you
locked the vehicle from outside.Note on driving with the electrohydrau-
lic brake system
Following extended periods of only mi-
nor loads to your brake system, you
should occasionally apply the brakes
when traveling at high speeds. This im-
proves the grip of the brake pads.
After driving on wet or snow-covered
roads, you should apply your brakes
firmly before parking your vehicle. This
produces heat which serves to dry the
brake disks and help prevent corro-
sion.
On long and steep grades, shift to a
lower gear (gear range1, 2, or 3) to
prevent the brakes from overheating
and to reduce brake wear.
Warning!
G
Have brake pad replacement and other work
on the electrohydraulic brake system car-
ried out by qualified technicians only. Con-
tact an authorized Mercedes-Benz Center
for further information. The electrohydraulic
brake system must be deactivated prior to
working on the system. High pressure is in-
termittently built up in the system as part of
its automatic self-test. In addition, the sys-
tem is automatically activated when the ve-
hicle is unlocked by SmartKey, when the
driver or passenger door is opened, when
the starter switch is turned to position
1,
when the brake pedal is depressed or when
the parking brake is released. Failure to de-
activate the system prior to maintenance
will cause brake pistons to extend and brake
fluid to leak, which may result in injuries
(contusions and acid burns). Extended
brake pistons may also cause injury.
Warning!
G
Be very careful not to endanger other road
users when you apply the brakes.
100 Safety and SecurityDriving safety systems
After hard braking, it is advisable to
drive on for some time so that the air
stream will cool down the brakes fast-
er.
Only Mercedes-Benz approved compo-
nents (e.g. brake pads) should be in-
stalled on your vehicle. Brake pads not
approved by Mercedes-Benz may im-
pair the safety of your vehicle.
Four wheel electronic traction system
(4MATIC) with the ESP
®
Models with all-wheel-drive only.
The 4MATIC improves vehicle’s ability to
use available traction, e.g. during winter
operation in mountains under snowy
conditions, by applying power to all four
wheels.
Warning!
G
If you see the ESP
® warning lampv
flashing in the speedometer, proceed as fol-
lows:
While driving off, apply as little throttle
as possible
While driving, ease up on the accelera-
tor
Adapt your speed and driving style to
the prevailing road conditions
Failure to observe these guidelines could
cause the vehicle to skid.
The ESP
® cannot prevent accidents result-
ing from excessive speed.
!Do not tow with one axle raised.
Otherwise the transfer case can be
damaged, which is not covered by the
Mercedes-Benz Limited Warranty.
!Performance testing must only be con-
ducted on a two-axle dynamometer.
Otherwise the transfer case can be
damaged, which is not covered by the
Mercedes-Benz Limited Warranty.!Because of the ESP’s
® automatic oper-
ation, the engine and the ignition must
be shut off (SmartKey in starter switch
position0 or1 or KEYLESS-GO
start/stop button* in position0 or1)
when the parking brake is being tested
on a brake test dynamometer.
Active braking action through ESP
®
may otherwise seriously damage the
front or rear axle brake system.
Operational tests with the engine
running can only be conducted on a
two-axle dynamometer.
101 Safety and Security
Anti-theft systems
Anti-theft systems
Immobilizer
The immobilizer prevents unauthorized
persons from starting your vehicle.
Activating
With the SmartKey
Remove the SmartKey from the starter
switch.
With KEYLESS-GO*
Turn off the engine by means of the
start/stop button on the gear selector
lever.
Open the driver’s door.Deactivating
With the SmartKey
Switch on the ignition (
page 36).
With KEYLESS-GO*
Start the engine by means of the
start/stop button on the gear selector
lever.
Anti-theft alarm system
Once the alarm system has been armed, a
visual and audible alarm is triggered when
someone opens:
a door
the trunk
the hood
The alarm will stay on, even if the activat-
ing element (a door, for example) is imme-
diately closed.
iIn case the engine cannot be started
(yet the vehicle’s battery is charged),
the system is not operational. Contact
an authorized Mercedes-Benz Center
or call 1-800-FOR-MERCedes (in the
USA), or 1-800-387-0100 (in Canada).
102 Safety and SecurityAnti-theft systemsThe alarm system will also be triggered
when
someone attempts to raise the vehicle
the vehicle is opened using the
mechanical key
someone opens a door from the inside
someone opens the trunk with the
emergency release buttonArming the alarm system
The indicator lamp located in the central
locking switch in the center console.
1Indicator lamp
Lock the vehicle with the SmartKey or
KEYLESS-GO*.
The turn signal lamps flash three times
to indicate that the alarm system is
armed. The indicator lamp1 begins to
flash after approximately 30 seconds
after arming the alarm system.
iIf the alarm stays on for more than
30 seconds, a call to the Response
Center is initiated automatically by the
Tele Aid system* (
page 286) provid-
ed Tele Aid service was subscribed to
and properly activated, and that neces-
sary cellular service and GPS coverage
are available.
iIf the turn signal lamps do not flash
three times, one of the following ele-
ments may not be properly closed:
a door
the trunk
the hood
Close the respective element and lock
the vehicle again.
103 Safety and Security
Anti-theft systems
Disarming the alarm system
Unlock your vehicle with the SmartKey
or KEYLESS-GO*.
The turn signal lamps flash once to
indicate that the alarm system is
disarmed.
Canceling the alarm
With the SmartKey
Insert the SmartKey in the starter
switch.
or
Press button Œ or ‹ on the
SmartKey.With KEYLESS-GO*
Pull an outside door handle.
The SmartKey with KEYLESS-GO must
be within 3 ft (1 m) of the vehicle.
or
Press the KEYLESS-GO* start/stop
button (
page 37).
The SmartKey with KEYLESS-GO must
be inside the vehicle.
Tow-away alarm
Once the tow-away alarm is armed, a visual
and audible alarm will be triggered when
someone attempts to raise the vehicle.
Arming tow-away alarm
Lock the vehicle with the SmartKey or
KEYLESS-GO*.
The tow-away alarm is automatically
armed after about 30 seconds.
iThe alarm system will rearm automati-
cally after approximately 40 seconds if
neither a door nor the trunk was
opened.
iThe tow-away protection alarm is trig-
gered, for example, if the vehicle is lift-
ed on one side.
If the alarm stays on for more than
30 seconds, a call to the Response
Center is initiated automatically by the
Tele Aid system (
page 286), provided
that the Tele Aid service was sub-
scribed to and properly activated, and
that necessary cellular service and GPS
coverage are available.
104 Safety and SecurityAnti-theft systemsDisarming tow-away alarm
To prevent triggering the tow-away alarm
feature, switch off the tow-away alarm be-
fore towing the vehicle, or when parking on
a surface subject to movement, such as a
ferry or auto train.
The button is located on the overhead con-
trol panel.
1Tow-away alarm off button
Switch off the ignition and remove the
SmartKey from the starter switch.
Press button1.
The indicator lamp in the button1
comes on briefly.
Exit and lock the vehicle with the
SmartKey or (vehicles with
KEYLESS-GO*) the lock button at each
door handle.Canceling tow-away alarm
With the SmartKey
Insert the SmartKey in the starter
switch.
or
Press button Œ or ‹ on the
SmartKey.
With KEYLESS-GO*
Pull an outside door handle.
The SmartKey with KEYLESS-GO must
be within 3 ft (1 m) of the vehicle.
or
Press the KEYLESS-GO* start/stop
button (
page 38).
The SmartKey with KEYLESS-GO must
be inside the vehicle.
iYou cannot disarm the tow-away alarm
when the ignition is switched on.
iWhen you unlock the vehicle, the
tow-away protection disarms automati-
cally.
The tow-away alarm remains disarmed
until you lock the vehicle again.
144 Controls in detailLightingLocator lighting and night security illu-
mination
Locator lighting and night security illumi-
nation are described in the “Control sys-
tem” section, see (
page 171) and
(
page 172).
Fog lampsFront fog lamps
Switch on the low beam headlamps
(page 141).
Pull out the exterior lamp switch to first
stop.
The front fog lamps are switched on.
The green indicator lamp‡ in the
exterior lamp switch comes on
(page 141).
Push in the exterior lamp switch.
The front fog lamps are switched off.
The green indicator lamp‡ in the
exterior lamp switch goes out.
Warning!
G
In low ambient lighting or foggy conditions,
only switch from position U to B with
the vehicle at a standstill in a safe location.
Switching from U to B will briefly
switch off the headlamps. Doing so while
driving in low ambient lighting conditions
may result in an accident.
iFog lamps will operate with the parking
lamps and/or the low beam headlamps
on. Fog lamps should only be used in
conjunction with low beam headlamps.
Consult your State or Province Motor
Vehicle Regulations regarding permis-
sible lamp operation.iFog lamps cannot be switched on with
the exterior lamp switch in
positionU. For switching on the fog
lamps, turn the exterior lamp switch to
positionB.
172 Controls in detailControl system
Press buttonj ork repeatedly
until the message
Function Surround
lighting
appears in the multifunction
display.
The selection marker is on the current
setting.
Press buttonæ orç to switch
the locator lighting function
on or
off
.
Turn the exterior lamp switch to
positionU when exiting the vehicle.
The locator lighting feature is activat-
ed.Setting ambient lighting
Use this function to adjust the brightness
of the ambient lighting.
Move the selection marker with
buttonæ orç to the
Lighting
submenu.
Press buttonj ork repeatedly
until the message
Ambient light Lev-
el
appears in the multifunction display.
The selection marker is on the current
setting.
Press buttonæ orç to select
the desired brightness of the ambient
lighting.
The setting
1 represents the darkest
level and setting
5 the brightest level.
The ambient light is switched off at set-
ting
0.Setting night security illumination
(Headlamps delayed shut-off)
Use this function to set whether you would
like the exterior lamps to remain on for
15 seconds during darkness after exiting
the vehicle and closing all doors.
With the delayed shut-off feature activated
and the exterior lamp switch in
positionU before the engine is turned
off, the following lamps will switch on
when the engine is turned off:
Parking lamps
Tail lamps
License plate lamps
Side marker lamps
Front fog lamps
If after turning off the engine you do not
open a door or do not close an opened
door, the lamps will automatically switch
off after 60 seconds.