Mercedes-Benz A Series Owner's Manual page 227

Practical advice
Troubleshooting
Warning and indicator lamps in the instrument cluster
Problem
- The yellow ABS warning
lamp comes on while the
engine is running.
- The yellow ABS warning
lamp comes on while the
engine is running.
224
Possible cause/consequence
G Risk of accident
ABS (Anti-lock Brake System) is
deactivated due to a fault. There-
fore, ESP ® (Electronic Stability
Program), BAS (Brake Assist), the
steering assistant STEER CON-
TROL, the hill start assist and the
tyre pressure loss warning sys-
tem are also deactivated.
The brake system continues to
function normally, but without
electronic support. The wheels
could therefore lock if you brake
hard.
If the ABS control unit is faulty,
other systems may also not be
available: e.g. Parktronic sys-
tem*, the navigation system* or
the Autotronic*.
G Risk of accident
The on-board voltage is too low.
ABS has been deactivated due to
undervoltage.
Suggested solutions
Drive on carefully.
X
Observe the additional messages in the multi-function display
X
( page 202).
Y
Visit a qualified specialist workshop.
X
Switch off consumers that are not required, e g. reading lamps or
X
interior lighting.
ABS will be available again as soon as the vehicle's electrical sys-
tem voltage increases.
* optional