2008 MERCEDES-BENZ CLK550 key

377 Practical hints
What to do if …?
Where will I find...?
Unlocking/locking in an emergency
Opening/closing in an emergency
(Cabriolet)
Resetting activated head restraints
Replacing SmartKey batteries
Replacing bulbs
Replacing wiper blades
Flat tire
Battery
Jump starting
Towing the vehicle
Fuses

400 Practical hints
What to do if …?
Display messagePossible cause/consequencePossible solution
PSelector Lever
In ParkYou have turned off the engine with the
KEYLESS-GO* start/stop button in gear
selector lever positionN and opened the
driver’s door.
or
You have attempted to switch off the en-
gine with the KEYLESS-GO* start/stop
button while the gear selector lever was in
positionR orD.Place the gear selector lever in
positionP.
Please Shift To
N or PYou have attempted to start the engine
with the KEYLESS-GO* start/stop button
while the gear selector lever was in
positionR orD.Place the gear selector lever in
positionP or N.
Run Flat Indicator
InoperativeRun Flat Indicator is malfunctioning.Have the Run Flat Indicator checked
at an authorized Mercedes-Benz
Center.
Check tires,
then restart
Run Flat Indicator.There was a warning message about a
loss in the tire inflation pressure and the
Run Flat Indicator has not been reactivat-
ed yet.Make sure the correct tire inflation
pressure is set for each tire.
Then restart the Run Flat Indicator.

404 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
2Brake WearThe brake pads have reached their
wear limit.Have the brake pads replaced as soon as
possible.
;(USA only)
!(Canada only)
Release
Parking BrakeYou are driving with the parking brake
set.Release the parking brake (page 53).
;(USA only)
3 (Canada only)
Check
Brake Fluid
LevelThere is insufficient brake fluid in the
reservoir.Risk of accident! Stop the vehicle in a safe
location or as soon as it is safe to do so
and notify an authorized Mercedes-Benz
Center. Do not add brake fluid! This will
not solve the problem.
Warning!G
Driving with the message Check Brake
Fluid Level
displayed can result in an ac-
cident. Have your brake system checked im-
mediately. Do not add brake fluid before
checking the brake system. Overfilling the
brake fluid reservoir can result in spilling
brake fluid on hot engine parts and the
brake fluid catching fire. You could be seri-
ously burned.
!If you find that the brake fluid in the brake
fluid reservoir has fallen to the minimum mark or
below, have the brake system checked for brake
pad thickness and leaks.!Brake pad thickness must be visually
checked by a qualified technician at the intervals
specified in the Maintenance Booklet.

410 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
I Change
Key BatteriesThe SmartKey with KEYLESS-GO* batter-
ies are discharged.Change the batteries (page 441).
Key Detected
In VehicleA SmartKey with KEYLESS-GO* left in the
vehicle was recognized while locking the
vehicle from the outside.Take the SmartKey out of the vehicle.
Key
Not DetectedThe SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.Change the position of the SmartKey
in the vehicle.
Operate the vehicle with the SmartKey
in the starter switch if necessary.
Key
Not DetectedThe SmartKey with KEYLESS-GO* is not
recognized while the engine is running be-
cause

the SmartKey is not in the vehicle

there is strong radio-frequency inter-
ference
Stop the vehicle as soon as it is safe to
do so.
Apply the parking brake (page 59).
Search for the SmartKey.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started
again after the engine has been stopped.
Please
get a new key.No additional code available for SmartKey
or SmartKey with KEYLESS-GO*Contact an authorized Mercedes-Benz
Center as soon as possible.

411 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
I Please don’t
forget your keyThis display appears (for a maximum of
60 seconds) if the driver’s door is opened
with the engine shut off and no SmartKey in
the starter switch.
Message is only a reminder.Insert SmartKey in the starter switch.
Take the SmartKey with
KEYLESS-GO* with you when leaving
the vehicle.
Remove KeyYou have forgotten to remove the SmartKey.Remove the SmartKey from the start-
er switch.
. Active Headlamps
Auxiliary Bulb OnThe active headlamps are malfunctioning. An-
other light is being used.Contact an authorized Mercedes-Benz
Center as soon as possible.
Active Headlamps
InoperativeThe Bi-Xenon cornering lamps system is mal-
functioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
AUTO-Light
InoperativeThe light sensor is malfunctioning. The head-
lamps switch on automatically.Contact an authorized Mercedes-Benz
Center as soon as possible.
To switch off the headlamps:
In the control system, set lamp opera-
tion to manual mode (
page 162).
Switch off the headlamps using the
exterior lamp switch (
page 129).
3rd
Brake LampThe high mounted brake lamp is malfunction-
ing. This message will only appear if a critical
number of LEDs have stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.

414 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
. Rear Foglamp
Auxiliary Bulb On

The foglamp is malfunctioning. A backup
bulb is being used.Replace the bulb as soon as possible
(
page 448).
Reverse Lamp
LeftThe left backup lamp is malfunctioning.Replace the bulb as soon as possible
(
page 448).
Reverse Lamp
RightThe right backup lamp is malfunctioning.Replace the bulb as soon as possible
(
page 448).
Switch Off LightsYou have removed the SmartKey from the
starter switch, opened the driver’s door
and left the headlamps on or removed the
SmartKey with KEYLESS-GO* from the ve-
hicle and left the headlamps on.Switch off the headlamps.
Switch Off Lights
Or
Remove KeyThe exterior lamp switch is in
positionU, and the SmartKey or
SmartKey with KEYLESS-GO* is in the
starter switch. The parking lamps remains
on.Remove SmartKey or SmartKey with
KEYLESS-GO* from starter switch.
or
Turn the exterior lamp switch to
positionM.
Tail Lamp
Left
Auxiliary Bulb On

The left tail lamp is malfunctioning. A
backup bulb is being used.Replace the bulb as soon as possible
(
page 448).

427 Practical hints
Unlocking/locking in an emergency
Unlocking/locking in an emergency
Unlocking the vehicle
If you are unable to unlock the vehicle with
the SmartKey or KEYLESS-GO*, open the
driver’s door and the trunk using the
mechanical key.
1Mechanical key locking tab
2Mechanical key
Move locking tab1 in the direction of
arrow.
Slide mechanical key2 out of the
housing.Unlocking the driver’s doorInsert the mechanical key2 into the
driver’s door lock until it stops.
Turn the mechanical key2 counter-
clockwise to position1 until the lock-
ing knob moves up.
The driver’s door is unlocked.
Pull the door handle to open the
driver’s door.
iUnlocking and opening the driver’s door
and/or the trunk with the mechanical key will
trigger the anti-theft alarm system.
To cancel the alarm, do one of the following:

Press button Œ or ‹on the
SmartKey.

Insert the SmartKey in the starter switch.
Vehicles with KEYLESS-GO*:

Pull the outside door handle.

Press the KEYLESS-GO* start/stop button
(
page 39).
1Unlocking
2Mechanical key

428 Practical hints
Unlocking/locking in an emergency
Unlocking the trunk
A minimum height clearance of 5.71 ft
(1.74 m) (CLK coupe) or 5.41 ft (1.65 m)
(CLK cabriolet) is required to open the
trunk lid.
The trunk lid lock is located next to the
handle above the rear license plate recess.Insert the mechanical key3 into the
trunk lid lock until it stops.
Turn the mechanical key3
counterclockwise to position1 and
hold it in this position.
Pull the trunk lid handle2 and lift the
trunk lid.
The trunk opens.
Turn the mechanical key3 back and
remove it from the trunk lid lock.
Locking the vehicle
If you cannot lock the vehicle with the
SmartKey or SmartKey with
KEYLESS-GO*, do the following:
Close the passenger door and the
trunk.
Press the central locking switch in the
center console (
page 118).
Check to see whether the locking knob
on the passenger door has moved
down.
If necessary, push it down manually.
Remove the mechanical key out of the
SmartKey (
page 427).
Check whether the trunk is locked.
If necessary, lock the trunk with the
mechanical key (
page 118).
Except for the driver’s door, the vehicle
should now be locked.
1Unlocking in an emergency
2Handle
3Mechanical key
!The trunk lid swings open upwards
automatically. Always make sure there is suffi-
cient overhead clearance.