Page 6 of 481

Contents
AUDIO menu ................................ 147
NAV* menu .................................. 149
Vehicle status
message memory menu ............... 149
Settings menu .............................. 151
Trip computer menu..................... 163
TEL menu* ................................... 165
Automatic transmission ..................... 168
Gear selector lever ....................... 168
Shifting procedure ....................... 169
Gear selector lever positions ....... 170
Driving tips ................................... 172
Gear ranges ................................. 173
Automatic shift program .............. 174
Gear selector lever
one-touch gearshifting................. 175
Steering wheel gearshift control
one-touch gearshifting* ............... 177
Emergency operation
(Limp-Home Mode) ...................... 178Good visibility ..................................... 179
Headlamp cleaning system* ......... 179
Rear view mirrors .......................... 179
Sun visors ..................................... 181
Rear window sunshade*
(Canada only) ................................ 182
Rear window defroster .................. 183
Climate control ................................... 184
Deactivating the
climate control system ................. 187
Operating the climate control
system in automatic mode............ 187
Setting the temperature................ 188
Adjusting air distribution............... 188
Adjusting air volume ..................... 189
Front defroster.............................. 189
Air recirculation mode .................. 190
Air conditioning............................. 192
Rear passenger compartment
adjustable air vents....................... 193
Automatic climate control .................. 194
Deactivating the automatic
climate control system ................. 197
Operating the automatic
climate control system
in automatic mode ........................ 197Setting the temperature ............... 198
Adjusting air distribution .............. 199
Adjusting air volume ..................... 200
Front defroster ............................. 200
Maximum cooling MAXCOOL ........ 201
Air recirculation mode .................. 201
Charcoal filter ............................... 203
Air conditioning ............................ 204
Residual heat and ventilation*
(Canada only)................................ 205
Rear passenger compartment
adjustable air vents ...................... 206
Audio system...................................... 207
Audio and telephone*, operation .. 207
Operating safety ........................... 207
Operating and display elements ... 208
Button and soft key operation ...... 210
Operation...................................... 210
Radio operation ............................ 214
Introduction to satellite radio*
(USA only) ..................................... 218
CD mode....................................... 223
GSM network phones ................... 230
TDMA or CDMA network phones .. 237
Emergency calls “911” ................. 243
Page 30 of 481
29 At a glance
Center console
Center console
Upper partItemPage
1Seat heater*, driver’s side
Seat ventilation*, driver’s
side124
125
2Parktronic system* deacti-
vation switch (Canada only)260
3Rear window sunshade*
switch (Canada only)182
4ESP® control switch91
5Hazard warning flasher
on/off switch135
6Central unlocking switch
Central locking switch119
119
7Switch for folding down rear
seat head restraints121
8Anti-theft alarm system
indicator lamp94
ItemPage
9Seat heater*,
passenger side
Seat ventilation*,
passenger side124
125
aFront passenger front air
bag off indicator lamp 74,
366
bAudio system,
or
COMAND* (see separate
operating instructions)147
cClimate control
Automatic climate control
Rear window defroster 184
194
183
Page 98 of 481
97 Controls in detail
Locking and unlocking
Seats
Memory function
Lighting
Instrument cluster
Control system
Automatic transmission
Good visibility
Climate control
Automatic climate control
Audio system
Power windows
Power tilt/sliding sunroof*
Driving systems
Loading
Useful features
Page 184 of 481

183 Controls in detail
Good visibility
Rear window defroster
The rear window defroster uses a large
amount of power. To keep the battery
drain to a minimum, switch off the
defroster as soon as the rear window is
clear. The defroster is automatically
deactivated after approximately
6 to 17 minutes of operation depending on
the outside temperature.
Switch on the ignition (page 36).Activating
Press buttonF or1 in the
climate control panel (
page 185) or
automatic climate control panel
(
page 195).
The indicator lamp on the button
comes on.
Deactivating
Press buttonF or1 again.
The indicator lamp on the button goes
out.
Warning!G
Any accumulation of snow and ice should be
removed from the rear window before
driving. Visibility could otherwise be
impaired, endangering you and others.
!If the rear window defroster switches off too
soon and the indicator lamp starts flashing, this
means that too many electrical consumers are
operating simultaneously and there is insuffi-
cient voltage in the battery. The system re-
sponds automatically by deactivating the rear
window defroster.
As soon as the battery has sufficient voltage, the
rear window defroster automatically switches on
again.
Page 185 of 481
184 Controls in detail
Climate control
CLK 350 standard equipped with climate control for Canada, for USA depending on vehicle production date.
Page 186 of 481
185 Controls in detail
Climate control
USA only (depending on vehicle production
date)
Canada only
Item
1Left side air vent, adjustable
2Thumbwheel for air volume control
for center air vents
3Right side air vent, adjustable
4Climate control panel
5Right center air vent, adjustable
6Thumbwheel for air volume control
for right side center air vent
7Thumbwheel for air volume control
for left side center air vent
8Left center air vent, adjustable
iFor draft-free ventilation, move the sliders
for the side air vents and center air vents to the
middle position.
Item
1Air volume control
2Left side temperature control
3Right side temperature control
4Air distribution control
5Rear window defroster
6AC cooling on/off
7Air distribution and air volume
(automatic mode)
8Air recirculation
9Front defroster
Page 187 of 481

186 Controls in detail
Climate control
The climate control is operational when-
ever the engine is running. You can oper-
ate the climate control system in either the
automatic or manual mode. The system
cools or heats the interior depending on
the selected interior temperature and the
current outside temperature.Nearly all dust particles, pollutants and
odors are filtered out before outside air en-
ters the passenger compartment through
the air distribution system.
The air conditioning will not engage (no
cooling) if the A/C mode is deactivated
(
page 192).
Warning!G
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature).
This may cause burns or frostbite on unpro-
tected skin in the immediate area of the air
vents. Always keep sufficient distance be-
tween unprotected parts of the body and the
air vents. If necessary, use the air distribu-
tion control (
page 185) to direct the air to
air vents in the vehicle interior that are not
in the immediate area of unprotected skin.
Warning!G
Follow the recommended settings for heat-
ing and cooling given on the following pag-
es. Otherwise the windows could fog up,
impairing visibility and endangering you and
others.
iSevere conditions (e.g. strong air pollution)
may require replacement of the filter before its
scheduled interval. A clogged filter will reduce
the air volume to the interior.
If the vehicle interior is hot, ventilate the interior
before driving off, see “Summer opening fea-
ture” (
page 248). The climate control will then
adjust the interior temperature to the set value
much faster.
Keep the air intake grille in front of the wind-
shield free of snow and debris.
Do not obstruct air flow by placing objects on the
air flow-through exhaust slots below the rear
window.
Page 188 of 481

187 Controls in detail
Climate control
Deactivating the climate control
system
Deactivating
Set air volume control1 (page 185)
to position0.
Reactivating
Make sure the ignition is switched on.
Set air volume control1 (page 185)
to any speed.
The previous settings are once again in
effect.Operating the climate control system
in automatic mode
Activating
Press buttonU (page 185) while
the engine is running.
The indicator lamp on the button
comes on. The air volume and air distri-
bution are adjusted automatically.
Use temperature controls2 and3
(
page 185) to separately adjust the
air temperature on each side of the
passenger compartment.
The temperature of the vehicle interior
is adjusted automatically.
Deactivating
Press buttonU (page 185) again.
The indicator lamp on the button goes
out. The automatic operation of air vol-
ume and air distribution switches off.
Warning!G
When the climate control is switched off, the
outside air supply and circulation are also
switched off. Only choose this setting for a
short time. Otherwise the windows could
fog up, impairing visibility and endangering
you and others.
iWhen operating the climate control system
in automatic mode, you will only rarely need to
adjust the temperature, air volume and air distri-
bution.
In automatic mode, the dehumidify function is
switched on when the system is cooling. If nec-
essary, this function can be switched off by
pushing the2 button.