Page 422 of 585
421 Practical hints
What to do if …
Problem
Possible cause/consequence
Suggested solution
<
The red seat belt telltale comes
on for a maximum of 6 seconds
after starting the engine.
The seat belt telltale reminds you and your
passengers to fasten your seat belts before
driving off.
Fasten your seat belts.
Regardless of whether the seat belts
are fastened or not, the seat belt tell-
tale always comes on and remains lit
for 6 seconds after starting the
engine.
<
You hear a warning chime for a
maximum of 6 seconds after
starting the engine.
You have forgotten to fasten your seat belt.
Fasten your seat belts.
The warning chime stops sounding.
Page 423 of 585
422 Practical hintsWhat to do if …Problem
Possible cause/consequence
Suggested solution
<
The red seat belt telltale comes
on while the vehicle is standing
still and the engine is running or
during driving.
You and/or your front passenger have
forgotten to fasten your seat belts.
Fasten your seat belts.
The seat belt telltale goes out.
There are items placed on the front passen-
ger seat and therefore the system senses the
front passenger seat as being occupied.
Remove the items from the front pas-
senger seat and put them in a safe
place.
The seat belt telltale goes out.
<
During driving the red seat belt
telltale flashes and you addition-
ally hear an intermittent warning
chime with increasing intensity.
The vehicle’s speed once exceeded 15 mph
(25 km/h) and you and/or your front pas-
senger have forgotten to fasten your seat
belts.
Fasten your seat belts.
The seat belt telltale goes out and the
warning chime stops sounding.
There are items placed on the front passen-
ger seat and therefore the system senses the
front passenger seat as being occupied.
Remove the items from the front pas-
senger seat and put them in a safe
place.
The seat belt telltale goes out and the
warning chime stops sounding.
i
After 60 seconds with an unfastened seat
belt the warning chime stops sounding and the
seat belt telltale illuminates continuously. The seat belt telltale will only go out if both, the
driver’s and front passenger’s seat belt are
fastened, or the vehicle is standing still and a
front door is opened.
Page 427 of 585
426 Practical hintsWhat to do if …Lamp in center consoleProblem
Possible cause/consequence
Suggested solution
59
The front passenger
front air bag off indicator
lamp illuminates and re-
mains illuminated with
the weight of a typical
adult or someone larger
than a small individual on
the front passenger seat.
The system is malfunctioning.
Have the system checked as soon as
possible by an authorized
Mercedes-Benz Light Truck Center.
Also read and observe messages in
the multifunction display and follow
corrective steps (
page 440).
Warning!
G
If the59indicator lamp
illuminates and remains illuminated with the
weight of a typical adult or someone larger
than a small individual on the front passen-
ger seat, do not have any passenger use the
front passenger seat until the system has
been repaired.
Page 428 of 585
427 Practical hints
What to do if …
Problem
Possible cause/conse-
quence
Suggested solution
59
The front passenger
front air bag off indicator
lamp does not illuminate
and/or does not remain
illuminated with the
weight of a typical
12-month-old child in a
standard child restraint or
less on the front passen-
ger seat.
The system is malfunction-
ing.
Make sure there is nothing between seat cushion and
child seat and check installation of the child seat.
Make sure no objects applying supplemental weight
onto the seat are present.
Make sure no objects which apply forces to the seat are
present (e.g. objects such as books, briefcases etc.
lodged behind or around the seat, head restraints push-
ing against roof etc.). The system may recognize such
forces as supplemental weight.
If the front passenger front air bag off indicator lamp re-
mains out, have the system checked as soon as possible
by an authorized Mercedes-Benz Light Truck Center. Do
not transport a child on the front passenger seat until
the system has been repaired.
Also note any messages in the multifunction display and
follow corrective steps (
page 440).
Warning!
G
If the59indicator lamp does
not illuminate or remains out with the
weight of a typical 12-month-old child in a
standard child restraint or less on the front
passenger seat, do not transport a child on
the front passenger seat until the system
has been repaired.
Page 441 of 585
440 Practical hintsWhat to do if …Display message
Possible
cause/consequence
Possible solution
Front passenger airbag
enabled
See Operator’s Manual
Front passenger front air bag
is activated while driving even
though a child, small
individual, or object below
the system’s weight thresh-
old is on the front passenger
seat, or the front passenger
seat is empty. Objects on the
seat or forces acting on the
seat may make the system
sense supplemental weight.
Stop the vehicle in a safe location as soon as possible and check the front
passenger seat for the following:
Apply the parking brake (
page 65).
Switch off the ignition (
page 40).
Remove child and child restraint from front passenger seat and properly
secure the child in rear seat employing the child restraint if necessary.
Remove any other items from on and around the front passenger seat
and make sure the storage bag on the back of the front passenger seat
is empty.
Make sure that no objects which apply forces to the seat are present
(e.g. objects such as books, briefcases etc. lodged behind or around the
seat, head restraints pushing against roof etc.). The system may recog-
nize such forces as supplemental weight and sense that an occupant on
the front passenger seat is of a greater weight than actually present.
Keep the seat unoccupied, close the front passenger door and switch
on the ignition (
page 40).
(Continued on next page)
Page 442 of 585
441 Practical hints
What to do if …
Display message
Possible
cause/conse-
quence
Possible solutionMonitor the 59indicator lamp on the center console (
page 89) and
the multifunction display in the instrument cluster (
page 26) for the following:
With the seat unoccupied and the ignition turned on,
the 59indicator lamp on the center console should illuminate and
remain illuminated, indicating that the OCS (
page 85) has deactivated the air
bag.
the message
Front passenger airbag enabled See Operator’s Manual
or the
message
Front passenger airbag disabled See Operator’s Manual
should not
appear in the multifunction display at any time the seat is unoccupied. Wait at last
60 seconds for the system to complete the necessary check cycles and to make
sure neither message appears in the multifunction display.
If above conditions are met, you can occupy the front passenger seat again.
Depending on the front passenger classification sensed by the OCS (
page 85),
the59indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the system
checked as soon as possible by an authorized Mercedes-Benz Light Truck Center.
Warning!
G
If the 59indicator lamp
remains out even after performing the above
corrective steps, do not have any children
12 years old and under and other small
individuals use the front passenger seat
until the system has been repaired.
Page 443 of 585
442 Practical hintsWhat to do if …Display message
Possible cause/conse-
quence
Possible solution
Front passenger airbag
disabled
See Operator’s Manual
Front passenger front air bag is
deactivated while driving even
though an adult or someone
larger than a small individual is
occupying the front passenger
seat. Forces acting on the seat
may make the system sense a
decrease in weight.
Stop the vehicle in a safe location as soon as possible and check the front
passenger seat for the following:
Apply the parking brake (
page 65).
Switch off the ignition (
page 40).
Have the front passenger vacate the seat and exit the vehicle.
Adjust the seat in a height position (
page 44).
Make sure that no objects which apply forces to the seat are present
(e.g. objects such as books, briefcases etc. lodged underneath, behind
or around the seat). Such forces may cause the system to sense that
an occupant of a lesser weight than actually present is on the front
passenger seat.
Keep the seat unoccupied, close the front passenger door and switch
on the ignition (
page 40).
(Continued on next page)
Page 444 of 585
443 Practical hints
What to do if …
Display message
Possible
cause/conse-
quence
Possible solutionMonitor the 59indicator lamp on the center console (
page 89) and
the multifunction display in the instrument cluster (
page 26) for the following:
With the seat unoccupied and the ignition turned on,
the 59indicator lamp on the center console should illuminate and
remain illuminated, indicating that the OCS (
page 85) has deactivated the air
bag.
the message
Front passenger airbag enabled See Operator’s Manual
or the
message
Front passenger airbag disabled See Operator’s Manual
should not
appear in the multifunction display at any time the seat is unoccupied. Wait at last
60 seconds for the system to complete the necessary check cycles and to make
sure neither message appears in the multifunction display.
If above conditions are met, you can occupy the front passenger seat again.
Depending on the front passenger classification sensed by the OCS (
page 85),
the59indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the system
checked as soon as possible by an authorized Mercedes-Benz Light Truck Center.
Warning!
G
If the 59indicator lamp
remains illuminated with an adult occupant
on the front passenger seat even after per-
forming the above corrective steps, do not
have any passenger use the front passenger
seat until the system has been repaired.
