83 Trip computer
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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 
86 Trip computer
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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.