Page 108 of 416
108 Controls in detailSeats1Shoulder region support
2Side bolster adjustment
3Massage function (PULSE)
4Lumbar region support
Adjusting the multicontour seat in the or-
der listed above is recommended.
Make sure that the ignition is switched 
on.
All lamps in the instrument cluster light 
up.Shoulder region support
Press 
æ
 or 
ç
 on switch1.
The air cushion inflates or deflates.
Lumbar region support
Press 
k
 or 
j
 on rocker 
switch4.
This selects the air cushion you wish to 
adjust.
Press 
æ
 or 
ç
 on rocker 
switch4.
The air cushion inflates or deflates.Side bolsters adjustment
Adjust the side bolsters so that they 
provide good lateral support using 
switch 2.iWhen the engine is turned off, the last 
cushion setting is retained in memory 
and the cushion is automatically ad-
justed to this setting when the engine 
is restarted. 
     
        
        Page 110 of 416

110 Controls in detailSeatsSeat ventilation*
The switch is located on the door. Seat 
ventilation can be activated manually with 
the SmartKey in starter switch position1 
or2 (
page 31) or by the summer open-
ing feature (
page 190).
The blue indicator lamps on the switch 
show the ventilation level selected:
1Seat ventilation switch
Make sure the ignition is switched on.
All lamps in the instrument cluster light 
up.
Switching on seat ventilation
Press switch1.
Three blue indicator lamps above the 
switch light up.
Continue pressing switch until the de-
sired seat ventilation level is reached.Switching off seat ventilation
Press switch1 repeatedly until all indi-
cator lamps go out.
Level3
Three indicator lamps lit
2
Two indicator lamps lit
1
One indicator lamp lit
off
No indicator lamp lit
iThe seat ventilation is automatically set 
to the highest level if activated via sum-
mer opening feature (
page 190).
!If one or all of the lamps blink on the 
seat ventilation switch, there is insuffi-
cient voltage since too many electrical 
consumers are 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 111 of 416
111 Controls in detailSeats
Seat heating*
Vehicles without seat ventilation*
The switch is located on the door.
1Normal heating
2Rapid heating
Make sure that the ignition is switched 
on.
All the lamps in the instrument cluster 
light up.Switching on seat heating
Press switch1.
A red indicator lamp above the switch 
lights up. 
Switching off seat heating
Press switch1 again. Rapid seat heating mode
Press switch2.
Both red indicator lamps above the 
switch light up. 
iThe seat heating will be automatically 
switched off after approximately 
30 minutes. 
iThe system switches over to normal 
heating mode after approximately five 
minutes. Only the right-hand indicator 
lamp remains lit.  
     
        
        Page 112 of 416
112 Controls in detailSeatsSwitching off rapid seat heating mode
Press switch2 again. Vehicles with seat ventilation*
The switch is located on the door. The red 
indicator lamps on the switch show the 
heating level selected:
1Seat heating switch
Make sure the ignition is switched on.
All the lamps in the instrument cluster 
light up.
Switching on seat heating
Press switch1 twice.
A red indicator lamp above the switch 
lights up. 
Switching off seat heating
Press switch1 again. 
!If one or both of the lamps on the seat 
heating switch are blinking, there is in-
sufficient voltage available since too 
many electrical consumers are turned 
on. The seat heating switches off auto-
matically.
The seat heating will switch back on 
again automatically as soon as suffi-
cient voltage is available.
Level2
Two indicator lamps lit
1
One indicator lamp lit
off
No indicator lamp lit
iThe seat heating will be automatically 
switched off after approximately 
30 minutes.  
     
        
        Page 123 of 416
123 Controls in detail
Lighting
Switching on rear fog lamp
Make sure that the low beam head-
lamps are switched on.
Pull out exterior lamp switch to second 
stop.
The yellow indicator lamp
†
 in the 
lamp switch lights up.
Combination switch
The combination switch is located on the 
left side of the steering column.
1High beam
2High beam flasherSwitching on high beams
Turn exterior lamp switch to 
position
B
 (page 120).
Push the combination switch in 
direction1.
The high beam symbol is illuminated on 
the instrument cluster (
page 22).
High beam flasher
Pull the combination switch briefly in 
direction2. 
     
        
        Page 127 of 416

127 Controls in detail
Instrument cluster
Instrument cluster
A full view illustration of the instrument 
cluster can be found in the “At a glance” 
section of this manual (
page 22).
The instrument cluster is activated when 
you
open a door
turn on the ignition
press the reset button 
J
(page 22)
switch on the exterior lamps
You can change the instrument cluster set-
tings in the Instrument cluster submenu of 
the control system (
page 149).
Instrument cluster illumination
1Knob for adjusting instrument cluster 
illumination
Use knob1 to adjust the illumination 
brightness for the instrument cluster.
Press knob1. The knob will pop out.
To brighten illumination
Turn knob1 in the instrument cluster 
clockwise.
The instrument cluster illumination will 
brighten.
To dim illumination
Turn knob1 in the instrument cluster 
counterclockwise.
The instrument cluster illumination will 
dim.
iThe instrument cluster illumination is 
dimmed or brightened automatically to 
suit ambient light conditions.
The instrument cluster illumination will 
also be adjusted automatically when 
you switch on the vehicle’s exterior 
lamps. 
     
        
        Page 128 of 416

128 Controls in detailInstrument clusterCoolant temperature gaugeDuring severe operating conditions and 
stop-and-go city traffic, the coolant tem-
perature may rise close to 248° F (120°C), 
i.e. close to the red zone of the tempera-
ture gauge.
The engine should not be operated with 
the coolant temperature above 248° F 
(120°C), i.e. in the red zone of the temper-
ature gauge. Doing so may cause serious 
engine damage which is not covered by the 
Mercedes-Benz Limited Warranty.
Trip odometer
Make sure you are viewing the trip odome-
ter display.
Press the 
è
 or 
ÿ
 button on the 
multifunction steering wheel repeated-
ly until the trip odometer appears if it is 
not displayed (
page 130).
Press and hold reset button
J
 on the 
instrument cluster (
page 22) until 
the trip odometer is reset.
Warning!
G
Driving when your engine is badly over-
heated can cause some fluids which 
may have leaked into the engine com-
partment to catch fire. You could be se-
riously burned.
Steam from an overheated engine can 
cause serious burns and can occur just 
by opening the engine hood. Stay away 
from the engine if you see or hear steam 
coming from it.
Turn off the engine, get out of the vehicle 
and do not stand near the vehicle until it 
cools down.
iExcessive coolant temperatures trigger 
a warning in the multifunction display. 
     
        
        Page 129 of 416

129 Controls in detail
Instrument cluster
Tachometer
The red marking on the tachometer de-
notes excessive engine speed.
To help protect the engine, the fuel supply 
is interrupted if the engine is operated 
within the red marking.
S 55 AMG
The tachometer of the S 55 AMG does not 
have a red marking denoting excessive en-
gine speed.
To help protect the engine, the fuel supply 
is interrupted if the engine is operated at 
an excessive engine speed.
Outside temperature indicator
The temperature sensor is located in the 
front bumper area. Due to its location, the 
sensor can be affected by road or engine 
heat during idling or slow driving. There-
fore, the accuracy of the displayed temper-
a t u r e  c a n  o n l y  b e  v e r i f i e d  b y  c o m p a r i s o n  t o  
a thermometer placed next to the sensor, 
not by comparison to external displays 
(e.g. bank signs etc.).When moving the vehicle into colder ambi-
ent temperatures (e.g. when leaving your 
garage), you will notice a delay before the 
lower temperature is displayed.
A delay also occurs when ambient temper-
atures rise. This prevents inaccurate tem-
perature indications caused by heat 
radiated from the engine during idling or 
slow driving.
!Avoid driving at excessive engine 
speeds, as it may result in serious en-
gine damage that is not covered by the 
Mercedes-Benz Limited Warranty.
Warning!
G
The outside temperature indicator is not de-
s i g n e d  t o  s e r v e  a s  a n  i c e - w a r n i n g  d e v i c e  a n d  
is therefore unsuitable for that purpose.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy, 
especially in wooded areas or on bridges.