Mercedes-Benz 2009 GL320 BlueTEC Operator's Manual page 194

Controls in detail
Driving systems
appropriate for the speed at which you are
currently driving.
If you maintain or reduce your speed, you will
see, for example, the following message in
the multifunction display while the vehicle is
lowering
The vehicle is lowered to off-road level 2.
Once off-road level 2 is reached, you will see,
for example, the following message in the
multifunction display:
While driving, the vehicle is lowered
automatically as follows:
At vehicle speeds above 55 mph
R
(88 km/h) or if the vehicle speed stays
192
between 40 mph (64 km/h) and 55 mph
(88 km/h) for approximately 20 seconds,
the off-road level 2 setting is canceled and
the vehicle is lowered to the off-road
level 1.
You will see, for example, the following
message in the multifunction display:
At speeds above 60 mph (96 km/h) the off-
R
road level 1 setting is canceled and the
vehicle is lowered to the highway level.
You will see, for example, the following
message in the multifunction display:
Depending on the ADS setting
R
( Y page 185), the vehicle will be lowered to
the highspeed level when traveling at
higher speeds. At speeds below 25 mph
(40 km/h) at the latest, it will be returned
to the highway level.
i The setting is stored when you turn off the
engine.
Highway level
! Keep in mind that on rough or uneven
roads, adjusting the vehicle to a lower level
may cause the vehicle underbody to come
in contact with the road and result in
damage to the vehicle underbody. Always
make sure the vehicle has sufficient ground
clearance before adjusting it to a lower
level.
X
Start the engine.
When one or more indicator lamps
X
Turn outer adjustment ring
indicator lamps flash.
3
The vehicle adjusts to the highway level.
The following message appears in the
multifunction display while the level is
being set:
are on:
3
until all lit
1