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135 Audio system
Technical
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Cassette mode 
Note:
Vehicles equipped with the COMAND system do not 
come with a factory installed cassette mechanism. 
A standard 1/8” stereo phono plug for auxiliary audio 
input (located in glove box) is provided for connection of 
a portable battery operated cassette player or any other 
portable device which uses a headphone output. Please 
refer to the COMAND operating manual for information 
concerning the activation of the audio input.
Playing cassettes
Press the “TAPE” button. When the eject (EJ) key is 
pressed, the display folds down and the cassette slot 
becomes visible. Push the cassette into the slot until it 
engages. The cassette will be pulled in automatically.Note:
Do not press directly on the radio display face.
Return the display panel to its normal position by 
folding it back up and pressing gently on the display 
frame to lock in place. 
When playing mono recorded tapes (e.g. books) through 
a stereo system the sound from one track might bleed to 
the other track, despite setting the balance to the full 
left or full right speakers.
Important!
If the display is in the down position for more than 
20 seconds, 2 successive beeps will be heard. This will 
continue at 5 second intervals until the display is 
returned to its normal position.
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140 Audio system
Technical
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
CD changer installed
1CD changer
1 
2CD magazine
3CD tray
4CD
If a CD changer1 is installed, it can be operated from the 
front control panel of the radio. A loaded magazine must 
be installed for CD playing.
1 Optional equipment
Loading/emptying the CD magazine
Slide the changer door to the right and press the eject 
button  . The magazine will be ejected. Remove the 
magazine. Pull out the CD tray until its stop is reached 
and place the CDs in the recess of the tray, label side up. 
Push the tray into the magazine in the direction shown 
by the arrow. Insert the loaded magazine into the 
changer.
Important!
Close the door after the magazine has been inserted.
Playing CDs
Press the “CD” button. The CD most recently played will 
start at the point where it was last switched off. CDs 
stored in the magazine can be selected by using the 
station preset buttons 1-6.
The magazine slot number of 
the selected CD will then be 
displayed after “CD”. The 
number of the track being 
played will be displayed after 
“TRACK”.
3
2
2
1
4
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        Page 174 of 346
171 Wind screen
Technical
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Important! 
The open end of the hooks must point toward the 
vehicle’s front. 3. Insert end section in right opening (3) on quarter 
panel first. Then push left end section toward 
vehicle center (arrow 4) until it meets the left 
opening. Insert end section in left opening (5). 
Push down on wind screen (6) until it locks in place. 
P65.00-2039-26
3
4
56
Wa r n i n g !  
Check for secure locking by pulling up on the 
wind screen. 
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204 Parking brake
Technical
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Parking brakeTo engage, firmly depress parking brake pedal. When 
the electronic key is in steering lock position 2, the 
brake warning lamp in the instrument cluster should 
come on brightly.
To release the parking brake, pull handle on instrument 
panel. The brake warning lamp in the instrument 
cluster should go out.
A warning sounds, if you start to drive without having 
released the parking brake.
Also see brake warning lamp on page 229.
Wa r n i n g !
When leaving the vehicle always remove the 
electronic key from the steering lock, and lock the 
vehicle. Do not leave children unattended in the 
vehicle, or with access to an unlocked vehicle. 
Children could release the parking brake, which 
could result in an accident or serious injury.
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255 Engine compartment
Technical
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar care Index To o pen :
To unlock the hood, pull release lever (1) under the 
driver’s side of the instrument panel. At the same time a 
handle will extend out of the radiator grill (it may be 
necessary to lift the hood up slightly).
Caution!
To avoid damage to the windshield wiper or hood, open 
the hood only with wiper in the parked position.Pull handle (2) to its stop out of radiator grill and open 
hood (do not pull up on handle).
To   c l o s e :
Lower hood and let it drop into lock from a height of 
approx. 1 ft. (30 cm), assisting with hands placed flat on 
edges of hood (3).
To avoid hood damage, please make sure that hood is 
fully closed. If not, repeat closing procedure. Do not 
push down on hood to attempt to fully close it.
P88.40-2025-26
1
P88.40-2017-26
3
2
3
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277 Towing
Technical
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar care Index The rear towing eye is located at the right, below the 
bumper. The front towing eye is located on the 
passenger side behind a cover in the bumper panel.
CLK 320 (except Sport Package):
Cover removal: 
Insert finger in recess of cover and pull cover out.
Cover installation: 
Engage cover at bottom and press in top securely.CLK 320 with Sport Package, CLK 430, CLK 55 AMG:
Cover removal: 
Hold left and right end of grille and pull out.
Cover installation: 
Engage left and right end of grille and press in securely.
P88.20-2026-26
P88.20-2027-26
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299 Manual release for fuel filler flap
Technical
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar care Index Manual release for fuel filler flap
The manual release knob is located behind the right 
side trunk panel.
In case the central locking system does not release the 
fuel filler flap, pull the manual release knob while 
simultaneously opening the fuel filler flap.Replacing wiper blade insert
For safety reasons, remove electronic key from steering 
lock before replacing the wiper blade, otherwise the 
motor can suddenly turn on and cause injury.
Notes:
Do not open engine hood with wiper arm folded forward.
Do not allow the wiper arm to contact the windshield 
glass without a wiper blade inserted. The glass may be 
scratched or broken.
Make certain that the wiper blade is properly installed. 
An improperly installed wiper blade may cause 
windshield damage.
P80.20-2051-26
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333 Index
Technical
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car careIndex Mirror, exterior, rear view  .............................................. 79
Mirror, inside, rear view  ................................................. 78
Multicontour seat  ............................................................ 55
Multifunction display  ...................................................... 88
Engine oil level indicator  ........................................... 92
FSS (Flexible service system)  ................................... 92
Setting the audio volume ......................................... 108
Trip and main odometer  ............................................ 92
Vehicle speed ............................................................... 92
Multifunction steering wheel  ........................................ 88
NNavigation system - Multifunction display  ................ 101
Night security illumination  ..........................................115OOn-board diagnostic system  .........................................228
Operator’s Manual  ............................................................. 8
Outside temperature indicator  ...................................... 86
Overhead control panel ................................................... 21
PPanic button  ......................................................................32
Parcel net in front passenger footwell  ........................ 156
Parking  ........................................................................... 208
Parking brake  .....................154, 194, 204, 208, 229, 266
PARKING BRAKE - malfunction and warning messages 
239
Power assistance  ........................................................... 206
Power seats, front ............................................................. 45
Backrest  ........................................................................ 54
Power windows  ............................................................... 146
Express opening and closing  .................................. 147
Opening and closing  ................................................... 31
Operated with soft top switch  ................................. 148
Synchronizing  ........................................................... 147
Problems with your vehicle ............................................ 14
Product information  .......................................................... 7RRadio
See Audio .................................................................... 133
Radio transmitters  ......................................................... 178
Rain sensor  ..................................................................... 118
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