
28 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Locking:
Press transmit button ‹ once. All turn signal lamps 
blink three times to indicate that the vehicle is locked 
and the antitheft alarm is activated.
Notes:
If the turn signal lamps do not blink three times when 
locking the vehicle, a door, the liftgate, or the hood is 
not properly closed. Close the respective element and 
lock the vehicle again with the remote control.
If the vehicle cannot be locked or unlocked by pressing 
the transmit button, then it may be necessary to change 
the batteries in the remote control or to synchronize the 
remote control, see page 270 and page 271.
Unlocking the liftgate
Press transmit button Š to unlock the liftgate. This 
also deactivates the antitheft alarm.
Important!
A minimum height clearance of 7 ft. (2.15 m) is 
required to open the liftgate.Panic button
To activate press and hold button (1) for at least one 
second. An audible alarm and blinking turn signal 
lamps will operate for approximately 3 minutes. 
Additionally the interior lights switch on automatically 
for approximately 3 minutes.
To deactivate press button (1) again, or press transmit 
button‹, ŒorŠ on the remote control, or 
turn key in steering lock to position 1. 

33 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Notes:
If doors are unlocked with the central locking switch 
after activating the automatic central locking, and 
neither door is opened, then the doors remain unlocked 
even at vehicle speeds of approximately 9 mph 
(15 km / h) or more.
If a door is opened from the inside at speeds of 
approximately 9mph (15km/h) or less with the 
automatic central locking activated, the door will again 
be automatically locked at speeds of approximately 
9 mph (15 km / h) or more.
Important!
When towing the vehicle, or with the vehicle on a 
dynamometer test stand, please, note the following:
With the engine running, the vehicle doors will lock if 
the left front wheel spins at vehicle speeds of 
approximately 9 mph (15 km / h) or more.
To prevent vehicle door locks from locking, deactivate 
the automatic central locking.Emergency unlocking in case of accident
The doors unlock automatically a short time after an 
accident in which an airbag or emergency tensioning 
retractor deploys (this is intended to aid rescue and 
exit). However, the key must still be in the steering lock 
position 1 or 2.
Additionally the hazard warning flashers turn on 
automatically and the interior lights switch on for 
approximately 30 minutes. 

35 Antitheft alarm system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Antitheft alarm system
The indicator lamp is located in the center console.
The antitheft alarm is automatically armed or disarmed 
with the remote control by locking or unlocking the 
vehicle.
The antitheft alarm is armed within approximately 
15 seconds after locking the vehicle with the remote 
control.
A blinking lamp in the center console indicates that the 
alarm is armed.
Notes:
Use of the key in the front door locks does not arm or 
disarm the antitheft alarm system.
The alarm sounds when unlocking the driver’s door 
with the mechanical key. Cancel alarm by turning key in 
steering lock to position 1, or with the remote control by 
pressing buttonŒ.
If the vehicle battery voltage falls below 10 volts, the 
alarm is automatically canceled and the antitheft alarm 
system is disarmed. When the voltage is above this 
value again, the antitheft alarm system is armed again.Operation:
Once the alarm system has been armed, the turn signal 
lamps will flash rapidly (approximately 3 minutes) and 
the horn will sound intermittently (approximately 
30 seconds) when someone:
•opens a door,
•opens the liftgate,
•opens the hood,
•breaks a window,
•attempts to raise the vehicle.
The alarm will stay on even if the activating element (a 
door, for example) is immediately closed.
If the alarm stays on for more than 20 seconds, an 
emergency call is initiated automatically. See Tele Aid 
on page 148.
Note:
The alarm system will cycle three times when triggered.
The interior lights are automatically switched on when 
the alarm comes on and go out when canceling the 
alarm. 

72 Rear view mirrors
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Automatic (optional on ML 320):
With the key in steering lock position 2 and the 
automatic antiglare function activated, the mirror 
reflection brightness responds to changes in light 
sensitivity.
To  a ctiva te:
Press button (1). The green indicator lamp in the rear 
view mirror lights up.To deactivate:
Press button (1) again. The indicator lamp in the rear 
view mirror goes out. The mirror brightness does not 
respond to changes in light sensitivity.
Notes:
With gear selector lever in position “R”, or with the 
interior lamps (except cargo compartment lamp) 
switched on, the mirror brightness does not respond to 
changes in light sensitivity.
The automatic antiglare function does not react, if 
incoming light is not aimed directly at sensors in the 
mirror.
Wa r n i n g !
In the case of an accident liquid electrolyte may 
escape the mirror housing when the mirror glass 
breaks.Electrolyte has an irritating effect. Do not allow the 
liquid come into contact with eyes, skin, clothing, 
or respiratory system. In cases it does, immediately 
flush affected area with water, and seek medical 
help if necessary. 

102 Climate control
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Windshield fogged up on outside.
Switch on wiper motor.
Set air distribution control switch to positiond 
ora.
Dust filter
Nearly all dust particles and pollen are filtered out 
before outside air enters the passenger compartment 
through the air distribution system. 
Note:
Keep the air intake grille in front of windshield free of 
snow and debris.
Climate control – OFF
To switch the climate control off, set air volume control 
switch to position0.
Switch off air conditioning mode œ. Control lamp in 
button goes out.Air recirculation
This mode can be selected to temporarily reduce the 
entry of annoying odors or dust into the vehicle’s 
interior.
Outside air is not supplied to the vehicles’s interior.
To select, press O button. Indicator lamp in button 
lights up.
To cancel, press O button again. Indicator lamp in 
button goes out.
If the windows should fog up from the inside, switch 
from recirculated air back to fresh air. 

305 Index
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car careIndex Headlamp cleaning system  ............................................ 94
Headlights ......................................................................... 90
Heated seats  ..................................................................... 44
Hood ................................................................................. 231
Hooks ............................................................................... 133
IIdentification labels .......................................................285
Illuminated vanity mirrors ............................................113
Indicator lamps in the instrument cluster ................... 78
Infant and child restraint system
Installation ................................................................... 67
Infant and child restraint systems  ................................ 65
Inflating the space-saver tire  .......................................249
Information call
See Tele Aid  ............................................................... 148
Instrument cluster  ........................................................... 76
Activating display  ....................................................... 80
Display illumination ................................................... 80
Indicator lamps  ........................................................... 78
Malfunction and indicator lamps  ........................... 218
Instrument lamps  ............................................................ 80Instruments and controls  ............................................... 18
Interior
General notes  ............................................................. 114
Interior lighting  .............................................................. 110
JJump starting  ................................................................. 253KKeys, vehicle  .....................................................................24LLamps, exterior .............................................................. 260
Adjusting headlamp aim  ......................................... 268
Auxiliary fog lamp  ............................................. 92, 264
Fog lamps  .....................................................................93
Headlamp assembly ......................................... 261, 262
Headlamps .................................90, 261, 262, 268, 280
High mounted stop lamp ......................................... 267
License plate lamps  ................................................. 267
Low and high beam ............................................90, 263 

28 
Central locking system
Te ch n ica l 
data 
Instruments  
and controls  Operation 
Driving Instrument  
cluster display  Practical hints Car care Index 
Locking: 
Press transmit button   ‹ once. All turn signal lamps  
blink three times to indicate that the vehicle is locked 
and the antitheft alarm is activated. 
Notes: 
If the turn signal lamps do not blink three times when  
locking the vehicle, a door, the liftgate, or the hood is 
not properly closed. Close the respective element and  
lock the vehicle again with the remote control. 
If the vehicle cannot be locked or unlocked by pressing  
the transmit button, then it may be necessary to change 
the batteries in the remote control or to synchronize the 
remote control, see page 270 and page 271. 
Unlocking the liftgate 
Press transmit button   Š to unlock the liftgate. This  
also deactivates the antitheft alarm. 
Important! 
A minimum height clearance of 7 ft. (2.15 m) is  
required to open the liftgate.  Panic button 
To activate press and hold button (1) for at least one  
second. An audible alarm and blinking turn signal 
lamps will operate for approximately 3 minutes.  
Additionally the interior lights switch on automatically  
for approximately 3 minutes. 
To deactivate press button (1) again, or press transmit  
button  ‹, Œ orŠ  on the remote control, or  
turn key in steering lock to position 1. 

33 
Central locking system
Te ch n ica l 
data 
Instruments  
and controls  Operation 
Driving Instrument  
cluster display  Practical hints Car care Index 
Notes: 
If doors are unlocked with the central locking switch  
after activating the automatic central locking, and  
neither door is opened, then the doors remain unlocked  
even at vehicle speeds of approximately 9 mph 
(15 km / h) or more. 
If a door is opened from the inside at speeds of  
approximately 9mph (15km/h) or less with the 
automatic central locking activated, the door will again  
be automatically locked at speeds of approximately  
9 mph (15 km / h) or more. 
Important! 
When towing the vehicle, or with the vehicle on a  
dynamometer test stand, please, note the following: 
With the engine running, the vehicle doors will lock if  
the left front wheel spins at vehicle speeds of 
approximately 9 mph (15 km / h) or more. 
To prevent vehicle door locks from locking, deactivate  
the automatic central locking.  Emergency unlocking in case of accident 
The doors unlock automatically a short time after an  
accident in which an airbag or emergency tensioning 
retractor deploys (this is intended to aid rescue and  
exit). However, the key must still be in the steering lock  
position 1 or 2. 
Additionally the hazard warning flashers turn on  
automatically and the interior lights switch on for 
approximately 30 minutes.