2008 MERCEDES-BENZ CLS63AMG alternator

344 Practical hints
What to do if …
Lamps in instrument clusterGeneral information:
If any of the following lamps in the instru-
ment cluster fails to come on during thebulb self-check when switching on the igni-
tion, have the respective bulb checked and
replaced if necessary.
ProblemPossible cause/consequenceSuggested solution
-The yellow ABS indicator lamp
comes on while the engine is
running.The ABS has detected a malfunction and has
switched off. The BAS, EBP, ESP® and
PRE-SAFE® are also switched off (see messages
in multifunction display).
The brake system is still functioning normally
but without the ABS available.
If the ABS control unit is malfunctioning, other
systems such as the Parktronic system*, Dis-
tronic*, navigation system*, or the automatic
transmission may also be malfunctioning.
Continue driving with added caution.
Wheels may lock during hard braking,
reducing steering capability.
Read and observe messages in the
multifunction display (
page 358).
Have the system checked at an autho-
rized Mercedes-Benz Center as soon
as possible.
Failure to follow these instructions in-
creases the risk of an accident.
The charging voltage has fallen below 10 volts.
The ABS has switched off.
The battery may not be sufficiently charged.When the voltage is above this value
again, the ABS is operational again and
the ABS indicator lamp should go out.
If the ABS indicator lamp does not go out:
Have the generator (alternator) and
battery checked.

372 Practical hints
What to do if …
Symbol messages
Display symbolDisplay messagePossible cause/consequencePossible solution
V You are driving with one or more doors
open.Close the doors.
YYou are driving with the hood open.Close the hood (page 286).
Ê This message will appear whenever the
trunk is open.Close the trunk.
#The battery is no longer charging.
Possible causes:

alternator malfunctioning

broken poly-V-belt
Considerably greater brake pedal force is
required and the stopping distance is
increased.
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 re-
sult in damage to the engine. Notify
an authorized Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest
authorized Mercedes-Benz Center.
Adjust driving to be consistent with
reduced braking responsiveness.

373 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
#There is a malfunction in the electronic
system.Have the system checked at an autho-
rized Mercedes-Benz Center as soon
as possible.
#Battery/Alternator
Stop VehicleThe battery is malfunctioning.
Considerably greater brake pedal force is
required and the stopping distance is in-
creased.Stop the vehicle as soon as it is safe
to do so. Adjust driving to be consis-
tent with reduced braking responsive-
ness.
Call Roadside Assistance.
Notify an authorized Mercedes-Benz
Center.
#Low Voltage
Start EngineThe battery has insufficient voltage.Start the engine (page 51).
2Brake WearThe brake pads have reached their wear
limit.Have the brake pads replaced as soon
as possible.
!Brake pad thickness must be visually in-
spected by a qualified technician at the intervals
specified in the Maintenance Booklet.

421 Practical hints
Battery
Disconnecting the battery
Depress parking brake firmly or move
gear selector lever to positionP.
Turn off all electrical consumers.
Remove SmartKey from starter switch.
Vehicles with KEYLESS-GO*:
Press the start/stop button until
the engine shuts off.
Open the driver’s door.
Open the trunk.
Read and observe safety instructions
and precautions (
page 420).
Remove the luggage box (page 397).
Disconnect battery negative lead2.
Remove cover1 from the positive ter-
minal.
Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.
Remove the battery bracket.
Pull out the battery ventilation tube
from the battery (depending on battery
arrangement in your vehicle model, the
battery ventilation tube is located on
the left or right side of the battery).
Take out the battery.
!As with any other battery, disconnect the
battery if you do not intend to operate your vehi-
cle for an extended period of time to prevent bat-
tery discharge or connect an accessory battery
charge unit expressly approved by
Mercedes-Benz for your vehicle model to main-
tain the battery charge. Contact an authorized
Mercedes-Benz Center for further information.
The battery, the battery ventilation hose and the
lateral plug must always be securely installed
when the vehicle is in operation.
!Never loosen or detach battery terminal
clamps while the engine is running or the
SmartKey is in the starter switch. Otherwise the
alternator and other electronic components
could be severely damaged.
Have the battery checked regularly by an autho-
rized Mercedes-Benz Center.
Refer to Maintenance Booklet for maintenance
intervals or contact your authorized
Mercedes-Benz Center for further information.
Warning!G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch and
pressing the KEYLESS-GO* start/stop
button on the gear selector lever will
have no effect

the gear selector lever will remain
locked in positionP

436 Technical data
Layout of poly-V-belt drive
CLS 550
1Idler pulley
2Idler pulley
3Automatic belt tensioner
4Power steering pump
5Air conditioning compressor
6Crankshaft
7Coolant pump
8Generator (alternator)CLS 63 AMG
1Idler pulley
2Idler pulley
3Idler pulley
4Automatic belt tensioner
5Power steering pump
6Air conditioning compressor
7Crankshaft
8Coolant pump
9Generator (alternator)

446 Technical data
Electrical system
ModelCLS 550CLS 63 AMG
Generator (alternator)14 V/180 A14 V/180 A
Starter motor12 V/1.7 kW12 V/2.1 kW
Battery12 V/100 Ah12 V/95 Ah
Spark plugsBosch F8 DPP 332U
NGK PFR 5R-11NGK ILZKAR7A10
Electrode gap0.039 in (1.00 mm)0.039 in (1.00 mm)
Tightening torque18.5 - 22 lb-ft (25 - 30 Nm)15 - 18.5 lb-ft (20 -25 Nm)