Page 406 of 522

405 Practical hints
What to do if …
Display message
Possible cause/consequence
Possible solution
(USA only)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.
Switch off the ignition (
page 38).
Have the front passenger vacate the seat and exit the vehicle.
Adjust the seat in a height position (
page 43).
Make sure that no objects which apply forces to the seat are present
(e.g. objects such as books, briefcases etc. lodged underneath, be-
hind 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 turn on
the ignition (
page 38).
(Continued on next page)
Page 407 of 522

406 Practical hintsWhat to do if …Display message
Possible cause/conse-
quence
Possible solutionMonitor the 75 indicator lamp on the center console (
page 29) and
the multifunction display in the instrument cluster (
page 26) for the following:
With the seat unoccupied and the ignition turned on,
the 75 indicator lamp on the center console should illuminate and
remain illuminated, indicating that the OCS (
page 80) has deactivated the
front passenger front 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 least 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. De-
pending on the front passenger classification sensed by the OCS (
page 80), the
75 indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the sys-
tem checked as soon as possible by an authorized Mercedes-Benz Center.
Warning!
G
If the 75 indicator 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.
Page 415 of 522

414 Practical hintsWhat to do if …Display symbol
Display message
Possible cause/consequence
Possible solution
ú
(USA only)
±
(Canada only)
Visit workshop
There may be a malfunction in the:
fuel injection system
ignition system
exhaust system
fuel system
Have the measuring system
checked by an authorized
Mercedes-Benz Center.
H
Top up coolant
See Operator’s Manual
The coolant level is too low.
Add coolant (
page 330).
If you have to add coolant frequent-
ly, have the cooling system checked
by an authorized Mercedes-Benz
Center.
Warning!
G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You could be seriously burned.
!
Do not ignore the low engine coolant level
warning. Extended driving with the message and
symbol displayed may cause serious engine
damage not covered by the Mercedes-Benz
Limited Warranty.
Do not drive without sufficient amount of coolant
in the cooling system. The engine will overheat
causing major engine damage.
Page 418 of 522

417 Practical hints
What to do if …
Display symbol
Display message
Possible cause/consequence
Possible solution
•
The cooling fan for the coolant is malfunc-
tioning.
Observe the coolant temperature indicator
in the instrument cluster (
page 27).
If the coolant temperature is under 248°F
(120°C), you may continue driving to an au-
thorized Mercedes-Benz Center.
Avoid placing heavy loads on the engine
(e.g. by driving uphill) as well as
stop-and-go traffic.
Have the fan replaced as soon as possible.
±
Display malfunction
Visit workshop
Certain electronic systems are unable to
relay information to the control system.
The following systems may have failed:
Coolant temperature display
Tachometer
Cruise control display
Have the electronic systems checked by an
authorized Mercedes-Benz Center.
Engine
Service
There may be a malfunction in:
the fuel injection system
the ignition system
the exhaust system
Have the engine checked as soon as possi-
ble by an authorized Mercedes-Benz Cen-
ter.
Page 509 of 522

508 IndexHead restraints 129
Comfort head restraint, Adjusting 44
Folding back 130
Front seat, Adjusting 43
Rear seat, Removing and
installing 130
Headlamp cleaning system* 198
Headlamp shut-off delay see Delayed
shut-off, Exterior lamps
Headlamps
Active Bi-Xenon headlamps* 137
Automatic headlamp mode 138
Bi-Xenon* 137
Cleaning lenses 372
Cleaning system* 198
Halogen 446
High beam see High beam flasher
High beam see High beam headlamps
Low beam see Low beam headlamps
Manual headlamp mode 138
Replacing bulbs 446
Switch 56
Headliner and shelf below rear window,
Cleaning and care of 376
Heated seats* 132Heated steering wheel
(Canada only) 289
Height adjustment
Vehicle level control 266
High beam flasher 57, 142
High beam headlamps 57, 137, 444
Indicator lamp 27, 142
Replacing bulbs 444
Switching on 142
High mounted brake lamp 445
High-performance brake system
(E 63 AMG only) 312
Hood 325
Message in display 430
Horn 25
HVAC see Climate control system
Hydroplaning 314
I
Identification labels 476
Identification Number, Vehicle (VIN) 477
Ignition 38
Immobilizer 106
Indicator lamps see Lamps, indicator and
warning
Infant and child restraint systems see Chil-
dren in the vehicleInflation pressure see Tires, Inflation pres-
sure
Inside door handle 119
Instrument cluster 26, 148
Illumination brightness 148
Lamps 380
Multifunction display 151
Instrument lighting see Instrument cluster,
Illumination brightness
Instrument panel see Instrument cluster
Instruments and controls see Cockpit
Interior lighting
Delayed shut-off 176
Interior rear view mirror 47
Auto-dimming mirrors 198
Interior storage spaces see Storage com-
partments
J
Jack 432
Jump starting 464
K
Key, Mechanical 436
Loss of 119
Valet locking 126