
1 Contents
IntroductionProduct information  .......................... 7
Roadside assistance ......................... 10
Where to find it  ................................ 14
Reporting Safety Defects  ................ 16Instruments and controlsInstruments and controls  ............... 18
Center console  .............................. 20
Overhead control panel  ............... 21OperationVehicle keys  ...................................... 24
Start lock-out  .................................... 25
General notes on the
central locking system  ............... 26
Central locking system  ................... 26
Radio frequency
remote control  .............................. 26
Unlocking the liftgate  .................. 28
Panic button  .................................. 28
Mechanical keys  ........................... 29Doors ................................................. 30
Central locking switch .................... 32
Automatic central locking  .......... 32
Emergency unlocking in case
of accident  ................................... 33
Liftgate .............................................. 34
Antitheft alarm system ................... 35
Tow-away alarm and
glass breakage sensor  ............... 36
Seats, front  ....................................... 37
Manual seats  ................................ 39
Power seats ................................... 40
Head restraint  ...............................41
Heated seats  ..................................... 44
Seat belts and integrated 
restraint system  .......................... 46
Seat belts  .......................................... 46
Seat belt nonusage 
warning system ............................ 47
BabySmart
TM airbag
deactivation system  ................... 53
Self-test BabySmart
TM 
without special child
seat installed  ................................ 53Supplemental restraint 
system (SRS)  ................................ 54
Emergency tensioning 
retractor (ETR) ............................. 55
Airbags .............................................. 56
Safety guidelines for the 
seat belt, emergency 
tensioning retractor
and airbag  ..................................... 63
Infant and child 
restraint systems .......................... 65
Adjustable steering wheel  .............. 70
Inside rear view mirror  .................. 71
Antiglare night position .............. 71
Exterior rear view mirrors  ............. 73
Exterior rear view mirror, 
electrically folding  ....................... 75
Instrument cluster  ........................... 76
Indicator lamps in the 
instrument cluster  ...................... 78
Trip computer  ................................... 83
Flexible service system (FSS)  ........ 87
Engine oil level indicator ................ 89
Exterior lamp switch  ....................... 90 

22 Contents - Operation
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
OperationVehicle keys  ...................................... 24
Start lock-out  .................................... 25
General notes on the
central locking system  ............... 26
Central locking system  ................... 26
Radio frequency
remote control  .............................. 26
Unlocking the liftgate  .................. 28
Panic button  .................................. 28
Mechanical keys  ........................... 29
Doors .................................................. 30
Central locking switch  .................... 32
Automatic central locking  .......... 32
Emergency unlocking in case
of accident  .................................... 33
Liftgate ............................................... 34
Antitheft alarm system  ................... 35
Tow - aw ay  a lar m  a n d
glass breakage sensor  ................ 36
Seats, front ........................................ 37
Manual seats ................................. 39
Power seats  ................................... 40Head restraint  ...............................41
Heated seats  ..................................... 44
Seat belts and integrated 
restraint system  .......................... 46
Seat belts  .......................................... 46
Seat belt nonusage 
warning system ............................ 47
BabySmart
TM airbag
deactivation system  ................... 53
Self-test BabySmart
TM 
without special child
seat installed  ................................ 53
Supplemental restraint 
system (SRS)  ............................... 54
Emergency tensioning 
retractor (ETR)  ............................ 55
Airbags .............................................. 56
Safety guidelines for the 
seat belt, emergency 
tensioning retractor
and airbag ..................................... 63
Infant and child 
restraint systems  ......................... 65
Adjustable steering wheel .............. 70
Inside rear view mirror  ...................71Antiglare night position .............. 71
Exterior rear view mirrors  ............. 73
Exterior rear view mirror, 
electrically folding  ....................... 75
Instrument cluster  ........................... 76
Indicator lamps in the 
instrument cluster  ...................... 78
Trip computer  ................................... 83
Flexible service system (FSS)  ........ 87
Engine oil level indicator ................ 89
Exterior lamp switch  ....................... 90
Fo g la mp sw itch 
(except Canada)  .......................... 92
Fo g la mp sw itch 
(Canada only)  .............................. 93
Hazard warning flasher 
switch ............................................ 94
Headlamp cleaning system  ............ 94
Windshield wiper/washer 
switch ............................................ 95
Rear window wiper/washer  ........... 96
Climate control ................................. 98
Basic setting – Heater  ............... 100 

36 Tow-away protection
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Tow-away alarm and glass breakage sensor
The switch is located in the overhead console.
The tow-away alarm and glass breakage sensor are part 
of the antitheft alarm system.
Once the alarm system has been armed, the turn signal 
lamps will flash rapidly and the horn will sound when 
someone attempts to raise the vehicle, or breaks a 
window and reaches into the passenger compartment.The alarm will last approximately 3 minutes in the form 
of rapidly flashing turn signal lamps. At the same time 
the horn will sound for approximately 30 seconds. The 
alarm will stay on even if the vehicle is immediately 
lowered.
If the alarm stays on for more than 20 seconds, an 
emergency call is initiated automatically. See Tele Aid 
on page 148.
To prevent triggering the tow-away alarm feature, switch 
off the tow-away alarm and glass breakage sensor before 
towing the vehicle, or when parking on a surface subject 
to movement, such as a ferry or auto train.
To do so, turn key in steering lock to position 1, then 
return it to position 0 and remove key from steering 
lock.
Within 30 seconds, push left or right button. (On 
vehicles equipped with optional trip computer, push 
RESET or MODE button, display shows OFF.)
Exit vehicle, and lock vehicle with remote control.
The tow-away alarm and glass breakage sensor remain 
switched off until the key is inserted in steering lock 
and turned to position 1. 

83 Trip computer
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Trip computer (standard; optional on model ML 320)
The trip computer is located in the overhead console.
Function keys are:
•RESET
•MODE
Note:
With engine not running, the display switches off 
automatically 30 seconds after the last entry.To select a mode:
With key in steering lock position 1 or 2, press MODE 
key repeatedly to illuminate the display and scroll 
through menu for one of the following options:
1. Date, see page 84.
2. Compass, see page 84.
3. Stop watch, see page 86.
4. Present fuel consumption – displays miles per 
gallon or liters pe r 100 km.
5. Average fuel consumption – displays miles per 
gallon or liters per 100 km, see page 86.
6. Distance remaining with fuel presently in tank.
Note:
The display f lashes when fuel supply drops to the 
reserve level. The distance remaining is no longer 
shown.
7. Language – Press RESET key until the desired 
language is displayed. Depending on language 
selected, information is displayed in that country’s 
customary system. See page 86.
8. Trip computer switched off.
MODE 

84 Trip computer
Te ch n ica l
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and controlsOperationDrivingInstrument 
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To change an entry, select mode to be changed:
•Date –
Press RESET key, the month shown blinks. Now 
press MODE key to advance to selected month.
Press RESET key again, the day shown blinks. Now 
press MODE key to advance to selected day.
Press RESET key again, the year shown blinks. Now 
press MODE key to advance to selected year.
Press RESET key again, the display stops blinking 
and the date is set.
•Compass –
The compass displays the direction the vehicle is 
traveling, such as N, NE, E, SE, S, SW, W or NW.
Note:
The presence of buildings, bridges, power lines and 
large antenna masts can influence the displayed 
values. Metallic or magnetic objects in or on the 
vehicle can influence the accuracy of the compass.To change the compass zones:
Determine the geographical point of the vehicle with the 
aid of the zone maps below:
1. Turn key in steering lock to position 2.
2. Press MODE key repeatedly until the compass 
display appears in the trip computer display.
3. Press RESET key to select the compass zone mode. 
The zone selected last is shown in the display.
4. Press RESET key repeatedly until the correct 
compass zone, as determined from the zone map, is 
shown in the display.
5. Press MODE key twice to activate the new compass 
zone and change back to compass display. 

85 Trip computer
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Zone map North America Zone map South America 

86 Trip computer
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
To calibrate the compass:
If the vehicle was exposed to a significant magnetic 
zone, such as high voltage power lines, the compass 
may have to be calibrated.
Calibration of the compass should be done in an area 
free of steel superstructures and power lines. All 
electrical consumers (e.g. exterior lamps, climate 
control, etc.) should be switched off, doors and liftgate 
closed. Do not open or close the roof. An open door or 
liftgate triggers the display “–––”.
1. Start and run the engine.
2. Press MODE key repeatedly until the compass 
display appears in the trip computer display.
3. Press RESET key to select the compass zone display.
4. Press RESET repeatedly until the correct zone, as 
determined from the zone map (see page 85), is 
shown in the display.
5. Press MODE key, “CAL–” appears in the display.
6. Press and hold RESET for a minimum of 2 seconds.7. Without interruption drive two or more full circles 
at a speed between 3 mph (5 km / h) and 7 mph 
(10 km / h) during which the message “CAL” is 
replaced with a compass bearing (e.g. N, SW etc.), 
immediately followed by three full circles at the 
same speed, with only the rear window defroster 
switched on. The defroster can be switched off 
again. The calibration of the compass is now 
complete.
•Stop watch  – 
Press RESET key to start the count. Press again to 
stop the count. Press and hold RESET key to reset 
sto p watch.
•Average fuel consumption –
 Press RESET key to delete present reading.
•Language –
Press RESET key to set the language used in the 
display. 

252 Battery
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar care Index
Therefore, we strongly recommend that you have the 
battery charge checked frequently, and corrected if 
necessary, especially if you use the vehicle less than 
approximately 200 miles (300 km) per month, 
mostly for short distance trips, or if it is not used for 
long periods of time.
Only charge a battery with a battery charger after the 
battery has been disconnected from the vehicle’s 
electrical circuit.
Always disconnect the battery negative lead first and 
connect last.
When removing and connecting the battery, always 
make sure that all electrical consumers are off and the 
key is in steering lock position 0. The battery must 
always be securely installed when the vehicle is in 
operation. During removal and installation always 
protect the disconnected battery positive (+) terminal 
with the cover attached to the battery.
While the engine is running the battery terminal clamps 
must not be loosened or detached, otherwise the 
generator and other electronic components would be 
damaged.Note:
After reconnecting the battery also set the clock in 
instrument cluster (see page 80), set date in trip 
computer (see page 83), resynchronize the sliding / pop-
up roof (see page 272), the Skyview Top (see page 273) 
and the electronic stability program (ESP) (see 
page 206).
Battery recycling
Batteries contain material that can harm the 
environment with improper disposal.
Large 12 Volt storage batteries contain lead.
Recycling of batteries is the preferred method of 
disposal.
Many states require sellers of batteries to accept old 
batteries for recycling.