MERCEDES-BENZ SLR 2007 R199 Owner's Manual

320 Practical hints
What to do if ...
Left display Right display Possible cause/consequencePossible solution
With the seat unoccupied and the ignition switched on,

the PASSENGER AIR BAG OFF indicator lamp (page 70) should
illuminate and remain illuminated, indicating that the OCS
(
page 67) has deactivated the passenger front air bag and the
passenger knee air bag.

the message Front passenger airbag enabled See Oper. Manual
or the message
Front passenger airbag disabled See Oper.
Manual
should not appear in the multifunction display at any time
the seat is unoccupied. Wait at least 60 seconds for the system to
complete the necessary check cycles and to make sure neither
message appears in the multifunction display.
If above conditions are met, you can occupy the passenger seat again.
Depending on the passenger classification sensed by the OCS
(
page 67), the PASSENGER AIR BAG OFF indicator 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 by an authorized
Mercedes-Benz Center.
Warning!G
If the PASSENGER AIR BAG OFF indicator
lamp remains out even after performing the
above corrective steps, do not have any
children 12 years old and under and other small individuals use the passenger seat
until the system has been repaired.

321 Practical hints
What to do if ...
Left display Right display Possible cause/consequencePossible solution
Front passenger
airbagdisabled
See Oper. ManualThe passenger front air bag is
deactivated while driving even
though an adult or someone
larger than a small individual is
occupying the 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 passenger seat for the following:
Switch off the ignition (page 40).
Apply the parking brake (page 55).
Have the passenger vacate the seat and exit the vehicle.
Keep the seat unoccupied, close the passenger door and
switch on the ignition (
page 40).
Monitor the PASSENGER AIR BAG OFF indicator lamp
(
page 70) and the multifunction display in the instrument
cluster (
page 117) for the following:
With the seat unoccupied and the ignition switched on,

the PASSENGER AIR BAG OFF indicator lamp (page 70)
should illuminate and remain illuminated, indicating that
the OCS (
page 67) has deactivated the passenger front
air bag and the passenger knee air bag.
(Continued on next page)

322 Practical hints
What to do if ...
Left display Right display Possible cause/consequencePossible solution

the message Front passenger airbag enabled See
Oper. Manual
or the message Front passenger airbag
disabled See Oper. Manual
should not appear in the
multifunction display at any time the seat is unoccu-
pied. Wait at least 60 seconds for the system to com-
plete the necessary check cycles and to make sure
neither message appears in the multifunction display.
If above conditions are met, you can occupy the passenger
seat again. Depending on the passenger classification
sensed by the OCS (
page 67), the PASSENGER AIR BAG
OFF indicator 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 by
an authorized Mercedes-Benz Center.
Warning!G
If the PASSENGER AIR BAG OFF indicator
lamp remains illuminated with an adult oc-
cupant on the passenger seat even after
performing the above corrective steps, do
not have any passenger use the passenger
seat until the system has been repaired.

323 Practical hints
What to do if ...
Left displayRight displayPossible cause/consequencePossible solution
PGear selector
lever to PYou wish to start the engine and the
selector lever is not in park
positionP.Move the selector lever to park positionP.
Shift to Nto startMove the selector lever to neutral
positionN.
SLRACL malfunction
Visit
workshop
The locking system is
malfunctioning.

The transmission cooling system
is malfunctioning.
Have the system checked at an authorized
Mercedes-Benz Center immediately.
SRSRestraint
system malfunction
Visit
workshopThere is a malfunction in the supple-
mental restraint systems. The
air bags or emergency tensioning de-
vices (ETDs) could deploy unexpect-
edly or fail to activate in an accident.Drive with added caution and have the
system checked at an authorized
Mercedes-Benz Center immediately.
Warning!G
In the event that a malfunction of the SRS is
indicated as outlined above, the SRS may
not be operational. For your safety, we
strongly recommend that you contact an
authorized Mercedes-Benz Center
immediately to have the system checked;
otherwise the SRS may not be deployed
when needed in an accident, which could re-
sult in serious or fatal injury, or it might de-
ploy unexpectedly and unnecessarily which
could result in an accident and/or injury to
you or to others.

324 Practical hints
What to do if ...
Left displayRight displayPossible cause/consequencePossible solution
Tire pressure
monitorreactivatedThe TPMS is using the current pressure
values as the basis for monitoring.
Tire pressuredisplayed only
after driving
a few minutesThe tire inflation pressure is being checked.Drive the vehicle for a few minutes.
Tire pressuredisplayed only
when ignition
is switched onSwitch on the ignition (page 40).
Tire pressure
monitortemporarily
unavailableThe tire inflation pressure monitor is unable
to monitor the tire inflation pressure due to

the presence of several wheel sensors in
the vehicle.

excessive wheel sensor temperatures.

a nearby radio interference source.

unrecognized wheel sensors mounted.
Remove any extra wheel sensors
from the vehicle.
As soon as the causes of the malfunc-
tion have been removed, the TPMS auto-
matically becomes active again.
Warning!G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.

325 Practical hints
What to do if ...
Left displayRight displayPossible cause/consequencePossible solution
Reactivate
tire pressure
monitorafter correcting
tire pressureThere was a tire inflation pressure warning
message.
The low tire pressure telltale for the TPMS
comes on and you have not reactivated the
system since the last tire inflation pressure
warning message.Reactivate the TPMS after correcting
the tire inflation pressure values
(
page 271).
Tire pressure
monitor
inoperativeDrive to
workshopThe TPMS is malfunctioning. Have the TPMS checked by an
authorized Mercedes-Benz Center.
A wheel without proper sensor was
installed.Have the wheel checked.
Please correct
the tire pressureThe tire inflation pressure is too low in one
or more tires.Check and correct tire inflation
pressure as required (
page 268).
Warning!G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.

326 Practical hints
What to do if ...
Left displayRight displayPossible cause/consequencePossible solution
TransmissionVisit
workshopThe provided operating safety of the
automatic transmission is reduced.Drive with added caution and have
the system checked at an authorized
Mercedes-Benz Center immediately.
TransmissionShift to NThe transmission is in neutral although the
gear selector lever is not.Move the gear selector lever to
neutral positionN.

327 Practical hints
What to do if ...
Symbol messages
Left displayRight displayPossible cause/
consequencePossible solution
malfunctionThe Airbrake locking mecha-
nism is malfunctioning.Contact an authorized Mercedes-Benz Center
immediately.
#Battery/Alternator
Stop carThe battery is malfunctioning.
The electro-hydraulic brake
system requires electrical
energy and therefore has only
limited operation. Considerably
greater brake pedal force is
required and the pedal travel is
longer. The stopping distance is
increased. If necessary, apply
full pressure to the brake pedal.Stop the vehicle as soon as it is safe to do so. Adjust
driving to be consistent with reduced braking
responsiveness.
Do not drive any further.
Call Roadside Assistance.
Contact an authorized Mercedes-Benz Center
immediately.

328 Practical hints
What to do if ...
Left displayRight displayPossible cause/
consequencePossible solution
#The battery is no longer
charging. Possible causes:

alternator malfunctioning

broken poly-V-belt
Do not forget that the brake
system requires electrical
energy and may be operating
with restricted capability.
Considerably greater brake
pedal force is required and the
pedal travel is longer. The stop-
ping distance is increased. If
necessary, apply full pressure
to the brake pedal.
Stop the vehicle immediately in a safe location 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. Contact an
authorized Mercedes-Benz Center.
If it is in order:
Contact an authorized Mercedes-Benz Center imme-
diately. Adjust driving to be consistent with reduced
braking responsiveness.
Read and observe additional messages in the
multifunction display.
The starter battery has been
charged with a battery charger
or jump started.Contact an authorized Mercedes-Benz Center.
There is a malfunction in the
electronic system.Have the system checked at an authorized
Mercedes-Benz Center immediately.

329 Practical hints
What to do if ...
Left displayRight displayPossible cause/
consequencePossible solution
TReduced
brake effect
Depress brake
pedal fully!The electro-hydraulic brake
system is in emergency opera-
tion mode. Considerably great-
er brake pedal force is required
and the pedal travel is longer.
The stopping distance is in-
creased. If necessary, apply full
pressure to the brake pedal.
The maximum speed is limited
to 55 mph (90 km/h).Stop the vehicle in a safe location or as soon as it is safe
to do so.
Apply the parking brake (page 55).
Do not drive any further.
Prevent the vehicle from rolling away by blocking the
wheels with wheel chocks or other sizeable objects.
Contact an authorized Mercedes-Benz Center.
or
Call for Roadside Assistance.
Warning!G
Driving while this message is displayed can
result in an accident. Have your brake
system checked immediately.
If the electro-hydraulic brake system enters
its emergency operation mode, the driver
must apply significantly greater brake pedal
pressure and depress the pedal much fur-
ther than normal to obtain braking effect.
If necessary, apply full pressure to the brake
pedal. Brakes are only applied to the front
wheels. Stopping distance is increased!
If there is a malfunction in the
electro-hydraulic brake system, we recom-
mend that the vehicle be transported with
all wheels off the ground using flatbed or ap-
propriate wheel lift/dolly equipment.A tow bar must be used if circumstances do
not permit the use of the recommended
towing methods and the vehicle requires
towing with all four wheels on the ground.
Towing the vehicle with all four wheels on
the ground is only permissible for distances
up to 30 miles (50 km) and at a speed not to
exceed 30 mph (50 km/h). For more infor-
mation, see “Towing the vehicle”
(
page 370).