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288 Driving mode
If malfunctions or faults occur during coupling/
uncoupling, the on-board computer will display a
red event window (
/
page 147).
Indicator lamps on the instrument cluster and
their meaning:
Lamp
Meaning
The semitrailer is not coupled up. The
£
monitored semitrailer coupling is not
Red
engaged.
The semitrailer is not correctly cou‐
¤
pled up. The monitored semitrailer
Red
coupling is engaged; however, no
semitrailer can be detected.
The semitrailer is correctly coupled
¤
up. Check that the monitored semi‐
Green
trailer coupling is in good condition
and engaged correctly.
The sensor on the fifth-wheel cou‐
î
pling is malfunctioning. Observe the
Red
additional information in the red
event window of the on-board com‐
puter.
Coupling up the tractor/semitrailer combina‐
tion
& WARNING Risk of accident due to exces‐
sive play between fifth-wheel kingpin and
coupling plate
If there is too much play on the tractor/semi-
trailer combination between the fifth-wheel
kingpin and the coupling plate, the semi-
trailer may break away from the coupling
plate.
You could lose the semi-trailer as a result.
Follow the fifth-wheel coupling manu‐
#
facturer's instructions.
For vehicles with a monitored semitrailer cou‐
pling, observe the information on the coupling/
uncoupling procedures in the manufacturer's
operating instructions.
Before coupling up:
Use chocks to secure the semitrailer against
#
rolling away.
Open the fifth-wheel coupling
#
2; see the manufacturer's operating instruc‐
tions.
Semitrailer trucks with air suspension: raise
#
or lower the chassis (
/
the semitrailer plate is 50 mm lower than the
fifth-wheel coupling 1.
Vehicles with steel suspension: use the sad‐
#
dle supports to set the height of the semi‐
trailer such that the semitrailer plate is
50 mm lower than the fifth-wheel coupling
1.
Removing the mudguard centre parts
Remove the mudguard centre parts
the following cases:
if the semitrailer makes the use of mudguard
R
centre parts
4
impossible
if the semitrailer's body covers the wheels
R
When using the mudguard centre parts 4,
observe the legal requirements for the coun‐
try you are currently in.
Release the rubber retainers
#
guard centre parts
4
on the left- and right-
hand sides of the vehicle.
Remove the mudguard centre parts 4.
#
Coupling up vehicles with a monitored semi‐
trailer coupling:
Drive slowly under the semitrailer plate.
#
1
with lever
page 262) so that
4
only in
3
of the mud‐
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