Mercedes-Benz 2007 SLR Mclaren Operator's Manual page 303

Practical hints
What to do if ...
Problem
-
The yellow ABS indicator
lamp comes on while the
engine is running.
302
Possible cause/consequence
Risk of accident!
The ABS has detected a malfunction and
has switched off. The BAS and the ESP
are also switched off.
If the ABS control unit is malfunctioning,
other systems such as the automatic
transmission may also be malfunctioning.
The electro-hydraulic brake system is still
functioning normally but without ABS
available.
The charging voltage has fallen below
10 volts. The ABS has switched off.
The battery may not be charged
sufficiently.
Suggested solutions
Continue driving with added caution. Wheels
may lock during hard braking, reducing
steering capability.
®
Have the system checked at an authorized
Mercedes-Benz Center immediately.
Failure to follow these instructions increases
the risk of an accident.
Read and observe messages in the
multifunction display ( page 314).
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 the
battery checked.