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.