Page 323 of 474

322 OperationTires and wheelsGeneral:
Depending on the design standards used,
the tire size molded into the sidewall may
have no letter or a letter preceding the tire
size designation.
No letter preceding the size designation
(as illustrated above): Passenger car tire
based on European design standards.
Letter “P” preceding the size designation:
Passenger car tire based on U.S. design
standards.
Letter “LT” preceding the size designation:
Light Truck tire based on U.S. design
standards.
Letter “T” preceding the size designation:
Temporary spare tires which are high
pressure compact spares designed for
temporary emergency use only. Tire width
The tire width1 (
page 321) indicates
the nominal tire width in mm.
Aspect ratio
The aspect ratio2 (page 321) is the
dimensional relationship between tire
section height and section width and is
expressed in percentage. The aspect ratio
is arrived at by dividing section height by
section width.
Tire code
The tire code3 (
page 321) indicates
the tire construction type. The “R” stands
for radial tire type. Letter “D” means diag-
onal or bias ply construction; letter “B”
means belted-bias ply construction.
At the tire manufacturer’s option, any tire
with a speed capability above 149 mph
(240 km/h) can include a “ZR” in the size
designation (for example: 245/40 ZR 18).
For additional information, see “Tire speed
rating” (
page 323).Rim diameter
The rim diameter4 (
page 321) is the
diameter of the bead seat, not the
diameter of the rim edge. Rim diameter is
indicated in inches (in).
Tire load rating
The tire load rating5 (page 321) is a
numerical code associated with the
maximum load a tire can support.
For example, a load rating of 91 corre-
sponds to a maximum load of 1 356 lbs
(615 kg) the tire is designed to support.
See also “Maximum tire load”
(
page 327) where the maximum load as-
sociated with the load index is indicated in
kilograms and lbs.
Page 332 of 474

331 Operation
Tires and wheels
Tire and loading terminology
Accessory weight
The combined weight (in excess of those
standard items which may be replaced) of
automatic transmission, power steering,
power brakes, power windows, power
seats, radio, and heater, to the extent that
these items are available as
factory-installed equipment (whether
installed or not).
Air pressure
The amount of air inside the tire pressing
outward on each square inch of the tire.
Air pressure is expressed in pounds per
square inch (psi), or kilopascal (kPa) or
bars.Aspect ratio
Dimensional relationship between tire
section height and section width
expressed in percentage.
Bar
Another metric unit for air pressure. There
are 14.5038 pounds per square inch (psi)
to 1 bar; there are 100 kilopascals (kPa)
to 1 bar.
Bead
The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the
rim.
Cold tire inflation pressure
Tire inflation pressure when your vehicle
has been sitting for at least three hours or
driven no more than one mile (1.6 km). Curb weight
The weight of a motor vehicle with stan-
dard equipment including the maximum
capacity of fuel, oil, and coolant, and, if so
equipped, air conditioning and additional
optional equipment, but without passen-
gers and cargo.
DOT (D
epartment o
f T
ransportation)
A tire branding symbol which denotes the
tire meets requirements of the
U.S. Department of Transportation.
GAWR (G
ross A
xle W
eight R
ating)
The GAWR is the maximum permissible
axle weight. The gross vehicle weight on
each axle must never exceed the GAWR for
the front and rear axle indicated on the
certification label located on the driver’s
door B-pillar.
Page 391 of 474

390 Practical hintsUnlocking/locking in an emergencyUnlocking and opening the trunk
A minimum height clearance of 5.71 ft
(1.74 m) is required to open the trunk lid.
The trunk lid lock is located next to the
handle above the rear license plate recess.
1Unlocking in an emergency
2Handle
Insert the mechanical key into the
trunk lid lock until it stops.
Turn the mechanical key
counterclockwise to position1.
The trunk lid unlocks.
Pull on handle2.
The trunk opens.
Turn the mechanical key back and
remove it from the trunk lid lock.
Locking the vehicle
If you can not lock the vehicle with the
SmartKey, do the following:
Close the passenger door, the rear
doors and the trunk.
Press the central locking switch in the
center console (
page 107).
Check to see whether the locking
knobs on the doors have moved down.
If necessary push them down manually.
Remove the mechanical key out of the
SmartKey (
page 389).
Check whether the trunk is locked.
If necessary, lock the trunk with the
mechanical key (
page 106).
Except for the driver’s door, the vehicle
should now be locked.
!The trunk lid swings open upwards
automatically. Always make sure there
is sufficient overhead clearance.
Page 439 of 474
438 Technical dataMain dimensionsModel
C230
C230Sport
C 280
C 350
C2804MATIC
C3504MATIC
C 350 Sport
Overall vehicle length
178.4 in (4 532 mm)
178.4 in (4 532 mm)
178.4 in (4 532 mm)
178.4 in (4 532 mm)
Overall vehicle width (exte-
rior rear view mirrors fold-
ed out)
77.8 in (1977 mm)
77.8 in (1977 mm)
77.8 in (1977 mm)
77.8 in (1977 mm)
Overall vehicle height
55.6 in (1 413 mm)
56.1 in (1 426 mm)
56.3 in (1 429 mm)
55.5 in (1 410 mm)
Wheelbase
106.9 in (2 715 mm)
106.9 in (2 715 mm)
106.9 in (2 715 mm)
106.9 in (2 715 mm)
Track, front
59.3 in (1 505 mm)
59.3 in (1 505 mm)
59.3 in (1 505 mm)
59.3 in (1 505 mm)
Track, rear
58.1 in (1 476 mm)
58.1 in (1 476 mm)
58.1 in (1 476 mm)
58.1 in (1 476 mm)
Page 468 of 474

467 Index
R
Radio
Operation 202, 207
Selecting stations (Control
system) 136
Radio transmitters 291
Range (distance to empty) 156
Reading lamp 125
Rear bench seat, foldable* 253
Rear door window
Blocking operation 85
Rear fog lamp see Fog lamps
Rear lamps see Tail lamps
Rear outer seats
Adjusting head restraint height 110
Rear passenger compartment
Adjustable air vents 184, 197
Rear seat ashtray see Ashtray
Rear seat head restraints see Head
restraints
Rear view mirrors see Mirrors
Rear window defroster 175
Rear window sunshade* 174
Recommended tire inflation
pressure 333Recovery services, Stolen vehicle
(Tele Aid*) 273
Refrigerant, Air conditioning 442
Refueling 294
Regular checks 295
Remote control, SmartKey 98
Remote door unlock (Tele Aid*) 272
Replacing bulbs
Additional turn signal lamps 403
Backup lamp 404
Brake lamps 404
Corner-illuminating front fog
lamps* 398
Fog lamps 404
Headlamps 398, 400, 402
High beam headlamps 398, 400
License plate lamps 404
Low beam headlamps 400
Parking lamps 401, 403, 404
Side marker lamps 403
Standing lamps 401, 403
Tail lamps 399, 404
Turn signal lamps 401, 403, 404
Reporting safety defects 18
Research Octane Number see RONReset button, In the instrument
cluster 127, 141
Reset tool
Location 394
Residual heat utilization 197
Residual ventilation 197
Restraint system
see Children in the vehicle
see Infant and child restraint systems
see SRS
Restraint system see Infant and child
restraint systems
Reverse gear position, Automatic
transmission* 49
Reverse gear position, Manual
transmission 48
Rims 333, 432
Roadside Assistance 12
RON 453
Roof rack* 250
Rubber parts, Cleaning 346
Run Flat Indicator* (Canada only) 317
Page 469 of 474

468 IndexS
Safety
Driving safety systems 87
Occupant 62
Reporting defects 18
Safety belts see Seat belts
Satellite radio* 211
Seat belt force limiter 72
Seat belts 69
Children in the vehicle 74
Cleaning 347
Fastening 45
Height adjustment 47
Message in display 381
Proper use of 47, 70
Safety guidelines 66
Telltale 25, 381
Seat heating* 114
Seating capacity 309
Seats, 35, 109
Heating* 113, 114
Lumbar support* 112
Manual 36, 109
Memory function*
(Power seats*) 115Multicontour seat*
(Canada only) 113
Power* 38, 109
Rear bench seat* 253
Securing cargo 256
Selector lever see gear selector lever
Self-test
OCS 81
Tele Aid* 266
Service and Warranty Booklet
Loss of 427
Service and warranty information 10
Service intervals see Maintenance service
indicator 338
Service life (tires) 305
Service see Maintenance Service system
see FSS (Canada vehicles) or Mainte-
nance System (U.S. vehicles) 338
Service System see FSS
Service, Parts 426
Settings
Control system menus and
submenus 133, 134
Date 147, 148
Factory, SmartKey 100Individual, SmartKey 100
Individual, Vehicle 140
Lighting (control system) 149
Memory function* 115
Menus and submenus 132
Resetting all (control system) 140
Selective, SmartKey 100
Time 145, 146
Shelf below rear window, cleaning 347
Shift lever position indicator 130, 163
Shift lock 453
Shift program mode, Automatic
transmission* 130
Shifting
Automatic transmission* 49, 162
Into optimal gear range
(automatic transmission*) 169
Into reverse (manual
transmission) 161
Manual transmission 48, 161
Side impact air bags (front and rear*) 68
Side marker lamps
Cleaning lenses 344
Messages in display 377
Replacing bulbs 403
Side windows see Power windows
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