2008 MERCEDES-BENZ CLK350 page 92

397 Practical hints
What to do if …?
Display messagePossible cause/ consequencePossible solution
Monitor the 56indicator lamp on the center console (page 31) and
the multifunction display in the instrument cluster (
page 28) for the following:
With the seat unoccupied and the ignition turned on,

the 56indicator lamp on the center console should illuminate and
remain illuminated, indicating that the OCS (
page 72) has deactivated the
air bag.

the message Front Passenger Airbag Enabled See Operator’s Manual or
the message
Front Passenger Airbag Disabled See Operator’s Manual
should not appear in the multifunction display at any time the seat is unoc-
cupied. Wait at least 60 seconds for the system to complete the necessary
check cycles and to make sure neither message appears in the multifunc-
tion display.
If above conditions are met, you can occupy the front passenger seat again. De-
pending on the front passenger classification sensed by the OCS (
page 72),
the 56indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the
system checked as soon as possible at an authorized Mercedes-Benz Center.
Warning!G
If the 56indicator lamp remains
out even after performing the above correc-
tive steps, do not have any children 12 years
old and under and other small individuals use the front passenger seat until the sys-
tem has been repaired.

398 Practical hints
What to do if …?
Display messagePossible cause/consequencePossible solution
Front Passenger
Airbag Disabled
See Operator’s ManualFront passenger front air bag is
deactivated while driving even
though an adult or someone larger
than a small individual is
occupying the front passenger
seat. Forces acting on the seat
may make the system sense a
decrease in weight.Stop the vehicle in a safe location as soon as possible and check the
front passenger seat for the following:
Switch off the ignition (page 38).
Have the front passenger vacate the seat and exit the vehicle.
Keep the seat unoccupied, close the front passenger door and
switch on the ignition (
page 38).
(Continued on next page)

399 Practical hints
What to do if …?
Display messagePossible cause/ consequencePossible solution
Monitor the 56indicator lamp on the center console (page 31) and
the multifunction display in the instrument cluster (
page 28) for the following:
With the seat unoccupied and the ignition turned on,

the 56indicator lamp on the center console should illuminate and
remain illuminated, indicating that the OCS (
page 72) has deactivated the
air bag.

the message Front Passenger Airbag Enabled See Operator’s Manual or
the message
Front Passenger Airbag Disabled See Operator’s Manual
should not appear in the multifunction display at any time the seat is unoc-
cupied. Wait at least 60 seconds for the system to complete the necessary
check cycles and to make sure neither message appears in the multifunc-
tion display.
If above conditions are met, you can occupy the front passenger seat again. De-
pending on the front passenger classification sensed by the OCS (
page 72),
the 56indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the
system checked as soon as possible at an authorized Mercedes-Benz Center.
Warning!G
If the 56indicator lamp remains
illuminated with an adult occupant on the
front passenger seat even after performing
the above corrective steps, do not have anypassenger use the front passenger seat until
the system has been repaired.

401 Practical hints
What to do if …?
Display messagePossible cause/consequencePossible solution
Tire Pressure
Check TiresThe Run Flat Indicator indicates that
the pressure is too low in one or more
tires.Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers. Observe
the traffic situation around you.
Check and adjust tire inflation pressure as
required (
page 341).
If necessary, change the wheel (page 452).
Restart the Run Flat Indicator after adjusting the
tire inflation pressure values (
page 343).
Tire Pressure
Monitor
InoperativeThe TPMS is malfunctioning.Have the TPMS checked at an authorized
Mercedes-Benz Center.
Tire Pressure
Monitor
Inoperative
No Wheel SensorsThere are wheels without appropriate
wheel sensors mounted (e.g. winter
tires).Have the TPMS checked at an authorized
Mercedes-Benz Center.
Have the wheel sensors installed at an authorized
Mercedes-Benz Center.
Tire Pressure
Monitor
Currently UnavailableThe TPMS is unable to monitor the tire
pressure due to a nearby radio inter-
ference source.As soon as the causes of the malfunction have been
removed, the TPMS automatically becomes active
again after a few minutes of driving.

403 Practical hints
What to do if …?
Symbol messages
Display symbolDisplay messagePossible cause/consequencePossible solution
#The battery is no longer charging.
Possible causes:

broken poly-V-belt

alternator malfunctioning
Stop immediately in a safe location or
as soon as it is safe to do so and check
the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an
inoperative water pump which may
result in damage to the engine. Notify
an authorized Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest
authorized Mercedes-Benz Center.
Low Voltage
Charge BatteryThe battery has insufficient voltage.Start the engine (page 51).
Low Voltage
Switch Off
ConsumersThe battery has insufficient voltage.Turn off unnecessary electrical con-
sumers.

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.

405 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
úVisit workshopThere may be a malfunction in the

fuel injection system

ignition system

exhaust system

fuel system
Have the measuring system checked
at an authorized Mercedes-Benz Cen-
ter.
B Top Up
Coolant
See Operator’s Man.The coolant level is too low.Add coolant (page 328).
If you have to add coolant frequently,
have the cooling system checked at
an authorized Mercedes-Benz Center.
Warning!G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You could be seriously burned.
!Do not ignore the low engine coolant level
warning. Extended driving with the message and
symbol displayed may cause serious engine
damage not covered by the Mercedes-Benz
Limited Warranty.
Do not drive without sufficient amount of coolant
in the cooling system. The engine will overheat,
causing major engine damage.

406 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
•Coolant
Stop vehicle,
turn engine off.The coolant is too hot.
Among other possible causes, the
poly-V-belt could be broken.Stop the vehicle in a safe location or
as soon as it is safe to do so.
Apply the parking brake (page 59).
Turn off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an in-
operative water pump which may re-
sult in damage to the engine. Contact
an authorized Mercedes-Benz Center.
If it is intact:
Wait for the message to disappear be-
fore restarting the engine.
Doing otherwise could result in seri-
ous engine damage that is not covered
by the Mercedes-Benz Limited War-
ranty.
(Continued on next page)