Mercedes-Benz 2011 GL-Class Operator's Manual page 246

Display messages
244
Driving systems
Display messages
°
Level Selection
Not Permitted
°
Compressor Cooling
Down
°
Malfunction
°
Rising
Max.12 MPH
°
Max.12 MPH
Æ
Being lowered
Max.12 MPH
Possible causes/consequences and M Solutions
You cannot change the vehicle level, because:
you are exceeding the permissible speed for the selected
R
vehicle level.
you are towing a trailer.
R
the trailer-coupling socket is being used, e.g. for a bicycle rack.
R
X
Drive more slowly and then select the desired vehicle level again
( Y page 194).
X
Observe the notes on towing a trailer (
You have selected a higher vehicle level. The compressor first
needs to cool down because of frequent level changes.
X
Drive in a manner appropriate for the current vehicle level.
X
Make sure that there is sufficient ground clearance.
X
Allow the compressor to cool down.
When the compressor has cooled down, the display message
disappears. The vehicle then continues rising to the selected
level.
Level control is faulty.
X
Do not drive faster than 50 mph(80 km/h).
X
Make sure that there is sufficient ground clearance.
X
Have the vehicle checked at a qualified specialist workshop.
The vehicle is being adjusted to off-road level 3. The display
message informs you of the maximum speed permissible for off-
road level 3.
X
Do not drive faster than 12 mph(20 km/h).
You are driving in off-road level 3. The display message informs
you of the maximum speed permissible for off-road level 3.
X
Do not drive faster than 12 mph(20 km/h).
The vehicle is being lowered from off-road level 3 to off-road level
2. The display message informs you of the maximum speed
permissible for off-road level 3.
X
Do not driver faster than 12 mph(20 km/h) until off-road level
2 is reached.
Y page 209).