Page 25 of 290
22 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Ve h i c l e k e y s
Included with your vehicle are 2 remote controls with
folding master keys.Remote control with folding master key
The remote control operates all locks on the vehicle.
To release the key, press button (1). The key unfolds
from the holder by itself.
The transmitter for the remote control is located in the
key holder.
Wa r n i n g !
When leaving the vehicle always remove the key
from the steering lock, and lock your vehicle. Do
not leave children unattended in the vehicle, or
with access to an unlocked vehicle. Unsupervised
use of vehicle equipment may cause serious
personal injury.
1
Page 41 of 290

38 Seats
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Power seats
To operate the power seat adjustment switches, turn key
in steering lock to position 1 or 2 (with a door open, the
power seats can also be operated with the key removed
or in steering lock position 0).
Wa r n i n g !
Do not adjust the driver’s seat while driving.
Adjusting the seat while driving could cause the
driver to lose control of the vehicle.Never place hands under seat or near any moving
parts while a seat is being adjusted.For your protection, drive only with properly
positioned head restraints.Adjust head restraint to support the back of the
head approximately at ear level.
Do not drive the vehicle without the seat head
restraints. Head restraints are intended to help
reduce injuries during an accident.When leaving the vehicle always remove the key
from the steering lock, and lock your vehicle.The power seats can also be operated with driver’s
or passenger door open. Do not leave children
unattended in the vehicle, or with access to an
unlocked vehicle. Unsupervised use of vehicle
equipment may cause serious personal injury.
Page 67 of 290

64 Restraint systems
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
USA Models only:
Since 1986 all U.S. child restraints comply with U.S.
regulations without the use of a tether strap.
Wa r n i n g !
Children 12 years old and under must never ride in
this vehicle, except in a Mercedes-Benz authorized
BabySmart
TM compatible child seat, which operates
with the BabySmart
TM system installed in the
vehicle to deactivate the passenger front airbag
when it is properly installed. Otherwise they will
be struck by the airbag when it inflates in a crash.
If this happens, serious or fatal injury can result.
Infants and small children must be seated in an
appropriate infant or child restraint system, which
is properly secured with the vehicle’s seat belt,
fully in accordance with the child seat
manufacturer’s instructions.Infants and small children should never share a
seat belt with another occupant. During an
accident, they could be crushed between the
occupant and seat belt.
Children too big for child restraint systems should
use regular seat belts. Position the shoulder belt
across chest and shoulder, not face or neck. A
booster seat may be necessary to achieve proper
belt positioning for children from 41 lbs. to the
point where a lap / shoulder belt fits properly
without one.When the child restraint is not in use, remove it
from the vehicle or secure it with the seat belt to
prevent the child restraint from becoming a
projectile in the event of an accident.Do not leave children unattended in the vehicle;
even if the children are secured in a child restraint
system. Unsupervised children in a child restraint
system may use vehicle equipment and may cause
serious personal injury.
Page 114 of 290

111 Interior equipment
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Power windows
Power window switches located on center console
Turn key in steering lock to position 1 or 2.
Press switch in to resistance point:
kto open
jto close
Release switch when window is in desired position.Express opening of door windows
Press switch k past resistance point and release –
window lowers to fully open position. To interrupt
procedure, briefly press j or k.
Note:
The power windows can also be operated with the
hardtop switch. To do so, push hardtop switch twice and
hold, see page 123.
P54.25-2031-26
Wa r n i n g !
When closing the windows, be sure that there is no
danger of anyone being harmed by the closing
procedure.The closing procedures can be immediately
reversed by either pressing the switch k,
turning the key to the unlocking position, or
pressing button Œ on the remote control, and
holding it.When leaving the vehicle, always remove the key
from the steering lock, and lock the vehicle. Do not
leave children unattended in the vehicle, or with
access to an unlocked vehicle. Unsupervised use of
vehicle equipment can cause serious personal
injury.
Page 120 of 290
117 Interior equipment
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index LighterSlide cover (arrow) open. Turn key in steering lock to
position 1 or 2.
Push in lighter (1); it will pop out automatically when
hot.
Note:
The lighter socket can be used to accommodate
electrical accessories up to maximum 85 W.
1
P68.20-2170-27
Wa r n i n g !
Never touch the heating element or sides of the
lighter, they are extremely hot, hold at knob only.When leaving the vehicle always remove the key
from the steering lock. Do not leave children
unattended in the vehicle, or with access to an
unlocked vehicle. Unsupervised use of vehicle
equipment may cause serious personal injury.
Page 145 of 290

142 Steering lock
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Steering lock
0The key can be withdrawn in this position only. The
steering is locked when the key is removed from the
steering lock. If necessary, move steering wheel
slightly to allow the locking mechanism to engage.
In vehicles equipped with automatic transmission,
the key can only be removed with the selector lever
in position “P”. After removing the key or with the
key in steering lock position 0, the selector lever is
locked in position “P”.1Steering is unlocked.
(If necessary, move steering wheel slightly to allow
the key to be turned clockwise to position 1.)
Most electrical consumers can be operated. For
detailed information see respective subjects.
2Driving position.
3Starting position.
See page 144 for instructions on starting and turning off
the engine.
2
3
0
1
Wa r n i n g !
When leaving the vehicle always remove the key
from the steering lock, and lock the vehicle. Do not
leave children unattended in the vehicle, or with
access to an unlocked vehicle. Unsupervised use of
vehicle equipment may cause serious personal
injury.
Page 260 of 290
257 Technical data
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index Layout of poly-V-belt drive
SLK 230 Kompressor
routing, belt I
The engine is equipped with two poly-V-belts.
1Crankshaft
2Air conditioner compressor
3Power steering pump
4Coolant pumpSLK 230 Kompressor
routing, belt II
For dimensions of the poly-V-belts, see page 260.
5Idler pulley
6Generator (alternator)
7Idler pulley
8Idler pulley
9Supercharger
P13.20-2007-26
9
6
8
7
4
1
5
32
5
32
9
6
8
4
1
7
P13.20-2008-26
Page 261 of 290
258 Technical data
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index
SLK 230 Kompressor
routing combined, belts I and II1Crankshaft
2Air conditioner compressor
3Power steering pump
4Coolant pump
5Idler pulley
6Generator (alternator)
7Idler pulley
8Idler pulley
9Supercharger
9
6
8
7
4
1
5
32P13.20-2009-26