Page 72 of 464

72 Safety and SecurityOccupant safetySelf-test BabySmart
TM1
 without special 
child seat installed
After turning the SmartKey in the starter 
switch to position1 or2 or pressing the 
KEYLESS-GO* start/stop button once or 
twice, the PASS. AIRBAG OFF indicator 
lamp1 located in the center console 
comes on for approximately six seconds 
and then goes out.
If the indicator lamp should not come on or 
is continuously lit, the system is not func-
tioning. You must see an authorized 
Mercedes-Benz Center before seating any 
child on the passenger seat.
More information can be found in the 
“Practical hints” section (page 319).
1BabySmart 
TM is a trademark of Siemens 
Automotive Corp.
Warning!
G
The BabySmart
TM airbag deactivation sys-
tem will ONLY work with a special child seat 
designed to operate with it. It will not work 
with child seats which are not BabySmart
TM 
compatible.
Never place anything between seat cushion 
and child seat (e.g. pillow), since it reduces 
the effectiveness of the deactivation sys-
tem. The bottom of the child seat must 
make full contact with the passenger seat 
cushion. An incorrectly mounted child seat 
could cause injuries to the child in case of an 
accident, instead of protecting the child.
Follow the manufacturer’s instructions for 
installation of special child seats.
Warning!
G
When using a BabySmart
TM compatible 
child seat on the front passenger seat, the 
passenger front airbag will not deploy only if 
the PASS. AIRBAG OFF indicator lamp re-
mains illuminated. 
Please make sure to check the indicator ev-
ery time you use the special system child 
seat. Should the light go out while the re-
straint is installed, please check installation. 
If the light remains out, do not use the 
BabySmart
TM restraint to transport children 
on the front passenger seat until the system 
has been repaired. 
     
        
        Page 108 of 464

108 Controls in detailLocking and unlockingLocking and unlocking from the inside
You can lock or unlock the doors and the 
trunk from inside using the central locking 
switch. This can be useful, for example, if 
you want to lock the vehicle before starting 
to drive.
The fuel filler flap will not be locked or un-
locked with the central locking switch.The switch is located in the center console.
Central locking switch1Locking
2Unlocking
Locking
Press upper half1 of the central lock-
ing switch.
If both doors are closed, the vehicle 
locks.Unlocking
Press lower half2 of the central lock-
ing switch.
The vehicle unlocks.
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, take the 
SmartKey with KEYLESS-GO* with you and 
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an 
unlocked vehicle. Unsupervised use of vehi-
cle equipment may cause an accident 
and/or serious personal injury.
iYou can open a locked door from the 
inside. Open door only when conditions 
are safe to do so.
If the vehicle was previously centrally 
locked with the SmartKey or the 
SmartKey with KEYLESS-GO*, it will 
not unlock using the central locking 
switch.
If the vehicle was previously locked 
with the central locking switch
while in the global remote control 
mode, the vehicle is completely un-
locked when a door is opened from 
the inside.
while in the selective remote con-
trol mode, only the door opened 
from inside is unlocked. 
     
        
        Page 113 of 464

113 Controls in detailSeats
Seat ventilation*
Both switches for the front seats are locat-
ed in the center console.
1Seat ventilation
The blue indicator lamps on the switch 
show which ventilation level you have 
selected: 
Make sure the ignition is switched on.
All lamps in the instrument cluster 
come on.
Switching on seat ventilation
Press lower switch position1.
Two blue indicator lamps on the switch 
come on. 
Continue pressing switch1 until the 
desired seat ventilation level is 
reached.
Switching off seat ventilation
Press lower switch position1 repeat-
edly until all blue indicator lamps go 
out.
Level2
Two indicator lamps on
1
One indicator lamp on
off
No indicator lamp on
!If one or all of the lamps flash on the 
seat ventilation switch, there is insuffi-
cient voltage due to too many electrical 
consumers being switched on. The seat 
ventilation switches off automatically.
The seat ventilation will switch back on 
again automatically as soon as suffi-
cient voltage is available. 
     
        
        Page 114 of 464

114 Controls in detailSeatsSeat heating*
Vehicles without seat ventilation*
Both switches for the front seats are locat-
ed in the center console.
1Normal heating
2Rapid heating
Make sure the ignition is switched on.
All the lamps in the instrument cluster 
come on.Switching on seat heating
Press upper switch position1.
A red indicator lamp on the switch 
comes on.
Switching off seat heating
Press upper switch position1 again. 
Switching on rapid seat heating
Press lower switch position2.
Both red indicator lamps on the switch 
come on.Switching off rapid seat heating
Press lower switch position2.
iThe seat heating will be automatically 
switched off after approximately 
20 minutes. iThe system switches over to normal 
heating mode after approximately ten 
minutes. Only one indicator lamp re-
mains lit. 
!If one or both of the lamps on the seat 
heater switch are flashing, there is in-
sufficient voltage available since too 
many electrical consumers are turned 
on. The seat heater switches off auto-
matically.
The seat heater will switch back on 
again automatically as soon as suffi-
cient voltage is available. 
     
        
        Page 115 of 464

115 Controls in detailSeats
Vehicles with seat ventilation*
Both switches for the front seats are locat-
ed in the center console.
1Seat heating
The red indicator lamps on the switch 
show the heating level you have selected: 
Make sure the ignition is switched on.
All the lamps in the instrument cluster 
come on.
Switching on seat heating
Press upper switch position1 twice.
A red indicator lamp on the switch 
comes on. 
Switching off seat heating
Press upper switch position1 again. 
Switching on rapid seat heating
Press upper switch position1 once.
Both red indicator lamps on the switch 
come on. Switching off rapid seat heating mode
Press switch position1 twice. 
Level2
Two indicator lamps on
1
One indicator lamp on
off
No indicator lamp on
iThe seat heating will be automatically 
switched off after approximately 
20 minutes. 
iThe system switches over to normal 
heating mode after approximately ten 
minutes. Only one indicator lamp re-
mains lit. !If one or both of the lamps on the seat 
heating switch are flashing, there is in-
sufficient voltage due to too many elec-
trical consumers are turned on. The 
seat heating switches off 
automatically.
The seat heating will switch back on 
again automatically as soon as suffi-
cient voltage is available. 
     
        
        Page 163 of 464

163 Controls in detail
Automatic transmission
Program mode selector switch
The program mode selector switch is 
located on the lower part of the center 
console.
1Program mode selector switch
S Sport For standard driving
C Comfort For comfort driving
Press the program mode selector 
switch 1 repeatedly until the letter of 
the desired shift program appears in 
the multifunction display (
page 129).
SelectCfor comfort driving:
The vehicle starts out in second 
gear (both forward and reverse) for 
gentler starts. This does not apply if 
full throttle is applied or gear 
range1 is selected.
Traction and driving stability are 
improved on icy roads.
Upshifts occur earlier even when 
you give more gas. The engine then 
operates at lower rpms and the 
wheels are less likely to spin.
The power transmission ratio for 
gear selector lever positionR 
changes depending on the program 
mode selected (SorC).
Accelerator position
Your driving style influences the 
transmission’s shifting behavior:
Less throttle Earlier upshifting
More throttle  Later upshifting
Kickdown 
Use kickdown when you want maximum 
acceleration.
Press the accelerator past the point of 
resistance.
The transmission shifts into a lower 
gear.
Ease on the accelerator when you have 
reached the desired speed. 
The transmission shifts up again.
!Never change the program mode when 
the gear selector lever is out of 
positionP. This could result in a 
change of driving characteristics for 
which you may not be prepared. 
     
        
        Page 164 of 464

164 Controls in detailAutomatic transmissionManual shift program CLK 55 AMG
In the manual shift program mode you can 
change the gears manually on the steering 
wheel (
page 161) or by using the gear 
selector lever (
page 158).
Allow engine to warm up under low load 
use. Do not place full load on the engine 
until the operating temperature has been 
reached. Shift into reverse gear only when 
the vehicle is stopped.Program mode selector switch
The program mode selector switch is 
located on the lower part of the center 
console.
1Program mode selector switch
S Sport For standard driving
C Comfort For comfort driving
M Manual For manual gear shifting
The selected shift program (
C/S/M) is 
indicated in the multifunction display 
(
page 129).Activating manual shift program
Press program mode selector 
switch1 repeatedly until the
M for 
manual shift program appears in the 
multifunction display.
The program mode switches to manual 
program modeM. Automatic shifting is 
switched off. The gear range is not 
limited.
You can change the gears manually when 
the gear selector lever is in positionD. You 
can upshift or downshift through the gears 
in succession.
The current gear selector lever position 
and the selected shift program (
C/S/M) is 
indicated in the multifunction display 
(
page 129).
!Avoid spinning of a drive wheel for an 
extended period when driving off on 
slippery road surfaces. This may cause 
serious damage to the drive train which 
is not covered by the Mercedes-Benz 
Limited Warranty. 
     
        
        Page 212 of 464
212 Controls in detailPower windows
Stopping windows
Press or pull respective switch again.Opening and closing the windows with 
the soft top switch
The soft top switch is located in the center 
console.
1Soft top switch
In addition to the power window switches, 
the windows can also be opened or closed 
with the soft top switch1.
!If the upward movement of a door win-
dow is blocked during the closing pro-
cedure, the door window will stop and 
open slightly.
Remove the obstruction, pull the 
switch again past the resistance point 
and release.
If the door window still does not close 
when there is no obstruction, then pull 
the switch and hold it. The door window 
will then close without the obstruction 
sensor function.
Warning!
G
Driver's door only:
If within five seconds you again pull the 
switch past the resistance point and re-
lease, the automatic reversal will not func-
tion.