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Practical hints
What to do if …
Lamps in instrument cluster General information:
If any of the following lamps in the instru-
ment cluster fails to come on during the
bulb self-check when switching on the
ignition, have the respective bulb checked
and replaced if necessary.
Problem Possible cause/consequence Suggested solution
- The yellow ABS indicator lamp
comes on while driving.
The ABS has detected a malfunction and
has switched off. The BAS and the ESP
®
are also switched off (see messages in dis-
play).
The brake system is still functioning nor-
mally but without the ABS available.
If the ABS control unit is malfunctioning,
other systems such as the 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 dis-
play (
୴ page 358).
̈ Have the system checked at an autho-
rized Mercedes-Benz Center as soon as
possible.
Failure to follow these instructions
increases the risk of an accident.
The charging voltage has fallen below ten
volts. The ABS has switched off.
The battery might not be charged suffi-
ciently.
̈ Switch off electrical consumers that are
currently not needed, e.g. seat heating*.
̈ If necessary, have the generator
(alternator) and battery checked.
When the voltage is above this value again,
the ABS is operational again.