Page 180 of 514

179 Controls in detail
Automatic transmission
Activating manual shift program
Press program mode selector
switch1 repeatedly until the
M for
manual program modeM appears in
the multifunction display.
The transmission switches to the
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.Upshifting
Briefly press the gear selector lever to
the right in theD+direction.
or
Briefly press button2 on the right
side of the steering wheel
(page 176).
The transmission shifts to the next
higher gear.
If, instead of the manual program mode
symbolM, thepsymbol appears in the
multifunction display (
page 167), shift to
the next higher gear. The fuel supply will
otherwise be interrupted to prevent the
engine from overrevving.
iFor information on automatic program
modesC orS, see “Automatic shift
program” (
page 172), “Gear selector
lever one-touch gearshifting”
(
page 173), and “Steering wheel
gearshift control one-touch gearshift-
ing” (page 174).
iThe manual program modeM will not
be stored. When the engine is turned
off with the manual program modeM
selected, the transmission will go to
the automatic program mode (CorS)
when the engine is restarted.!In the manual program modeM, the
transmission will not upshift, even if
the engine has reached its overrevving
range. Shift up to the next gear before
the engine has reached its overrevving
range. Make absolutely certain that the
engine speed does not reach the red
marking on the tachometer
(page 24). Otherwise the engine
could be damaged which is not covered
by the Mercedes-Benz Limited
Warranty.
Page 181 of 514

180 Controls in detailAutomatic transmissionDownshifting
Briefly press the gear selector lever to
the left in theD-direction.
or
Briefly press button1 on the left side
of the steering wheel (
page 176).
The transmission shifts to the next
lower gear.Kickdown
Using the kickdown when driving in the
manual program modeM is not possible.
Deactivating manual shift program
Press the program mode selector
switch (
page 178) repeatedly
until
Cor
S appears in the multifunction
display.
or
Restart the engine.
The transmission will go to the
automatic program mode (C orS).
The manual program modeM is not
stored.Emergency operation (Limp Home
Mode)
If vehicle acceleration worsens or the
transmission no longer shifts, the trans-
mission is most likely operating in limp
home (emergency operation) mode. In this
mode only second gear and reverse gear
can be activated.
Stop the vehicle.
Move gear selector lever toP.
Turn off the engine.
Wait at least ten seconds before
restarting.
Restart the engine.
Move gear selector lever to positionD
(for second gear) orR.
Have the transmission checked at an
authorized Mercedes-Benz Center as
soon as possible.
Warning!
G
On slippery road surfaces, never downshift
in order to obtain braking action. This could
result in drive wheel slip and reduced
vehicle control. Your vehicle’s ABS will not
prevent this type of loss of control.iWhen you brake or stop, the transmis-
sion shifts down to a gear from which
you can easily accelerate or take off.
Page 198 of 514

197 Controls in detail
Automatic climate control (CLK 500/CLK 55 AMG)
Canada only
USA only
Item
1
Left side air vent, adjustable
2
Thumbwheel for air volume control
for center air vents
3
Right side air vent, adjustable
4
Automatic climate control panel
5
Right center air vent, adjustable
6
Thumbwheel for air volume control
for right side center air vent
7
Thumbwheel for air volume control
for left side center air vent
8
Left center air vent, adjustableiFor draft-free ventilation, move the slid-
ers for the center air vents1, 3, 5,
8 to the middle position.
Item
1
Left side air distribution control
2
Front defroster
3
Temperature control, left, raising
4
Display
5
Air volume control, raising
6
Temperature control, right, raising
7
Rear window defroster
8
Right side air distribution control
9
Charcoal filter
a
AC cooling on/offResidual heat/ventilation
(Canada only)
b
Temperature control, right, lowering
c
Air volume control, lowering
d
Temperature control, left, lowering
e
Air recirculation
f
Automatic climate control on/off
(complete system)
g
Air distribution and air volume
(automatic mode)Item
Page 203 of 514

202 Controls in detailAutomatic climate control (CLK 500/CLK 55 AMG)The air conditioning switches
automatically to the following functions:
cooling on the dehumidify
maximum blowing and heating
power
air flows onto the windshield and
the front side windows
the air recirculation mode is
switched off
Deactivating
Press buttonP or0
(page 197) again.
The indicator lamp on the button goes
out.
The previous settings are once again in
effect.Windshield fogged on the outside
Switch the windshield wipers on
(page 54).
If the automatic mode of the automatic cli-
mate control is switched off:
Turn air distribution control1 or8
toa orY (
page 197).
Maximum cooling MAXCOOL
If the left and right air distribution controls
as well as the airflow volume control are
set toU (
page 197) and there is a
high need for cooling, the display
“MAXCOOL” appears.
This provides the fastest possible cooling
of the vehicle interior (when side windows
and soft top are closed).
iThe cooling remains switched on.
iKeep this setting selected only until the
windshield is clear again.
Page 211 of 514
210 Controls in detailAudio systemOperating and display elements
Page 212 of 514
211 Controls in detail
Audio system
Item
Page
1
CD changer mode selector
AUX mode selector
227
216
2
Single CD mode selector
228
3
Radio mode selector
4
Mute function (radio)
220
Pause (CD)
233
5
Volume distribution
215
6
Sound settings
213
7
Display
8
Alphanumeric keypad
Item
Page
9
Speed dialing memory (tele-
phone) in descending order
a
Accepting a call
(telephone)
238
b
Telephone mode selector
233
c
Speed dialing memory (tele-
phone) in ascending order
235
d
Terminating a call
(telephone)
239
e
CD slot
f
CD ejection
229
Item
Page
g
Soft keys
212
h
Volume
213
j
Switching on/off
212
k
Manual tuning / seek
tuning (radio)
218
Track search, reverse (CD)
232
l
Manual tuning / seek
tuning (radio)
218
Track search,
fast forward (CD)
232
Page 213 of 514

212 Controls in detailAudio systemButton and soft key operation
In these instructions, the alphanumeric
keypad (right side of radio panel) and the
function buttons (left side of radio panel)
are referred to as “buttons”. The four keys
below the display panel are referred to as
“soft keys”.
Operation
Switching the unit on/off
Switching on
Turn the SmartKey in the starter switch
to position 1 or 2.
If the audio system was on as you
removed the SmartKey from the starter
switch, the audio system will
automatically come back on as you
turn the SmartKey to position 1 or 2.
or
Press M button.Switching off
Remove SmartKey from starter switch.
or
Press M button.
!Do not press directly in the display
face. Otherwise, the display will be
damaged.
iIf the radio is switched on without the
key in the starter switch, it will
automatically switch off again after
approx. 30 minutes.
If your vehicle is equipped with a
telephone, the display may prompt you
to enter your PIN (GSM network) or
code (TDMA or CDMA network).iShould excessively high temperatures
occur while the audio system is being
operated, the display will dim. If tem-
peratures continue to rise,
HIGH TEMP
will appear in the display, after which
the audio system will be switched off
for a cooling-down period.
Page 214 of 514

213 Controls in detail
Audio system
Adjusting the volume
Turn rotary control of N button.
The volume will increase or decrease
depending on the direction turned.
Adjusting sound functions
The bass and treble functions are called up
by pressing the O button.
Settings for bass and treble are stored
separately for the AM and FM wavebands,
weather band, CD mode and telephone
mode.Bass
Press O button repeatedly until BASS
appears in the display.
Press
+ or
– soft key to increase or de-
crease tone level accordingly.
or
Press
RES
soft key briefly to reset bass
tones to their center level.
The radio switches back to the stan-
dard radio menu eight seconds after
the last soft key is pressed.Adjusting treble
Press O button repeatedly until TREBLE
appears in the display.
Press
+ or
– soft key to increase or de-
crease tone level accordingly.
or
Press
RES
soft key briefly to reset treble
tones to their center level.
The radio switches back to the stan-
dard radio menu eight seconds after
the last soft key is pressed.
iIf your vehicle equipment includes a
Mercedes-Benz specified mobile
telephone*, you can adjust its volume
separately from the volume of the
audio system while the telephone is
being used.