Mercedes-Benz S 450 4MATIC Operator's Manual page 679

Practical hints
What to do if ...?
Display
678
Possible cause/consequence
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
There is a malfunction in the electronic
system.
Possible solution
Stop the vehicle immediately in a safe loca-
tion.
Engage the electronic parking brake
( page 422).
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise the en-
gine will overheat due to an inoperative water
pump which may result in damage to the en-
gine.
Notify an authorized Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest authorized
Mercedes-Benz Center.
Have the system checked by an authorized
Mercedes-Benz Center as soon as possible.