Mercedes-Benz M-Class 2011 Owners Manual - Manual (Page 251)

Safety systems
Problem Possible causes/consequences and M Solutions
!
The yellow ABS warning
lamp is lit while the
engine is running. G Risk of accident
ABS (Anti-lock Brake System) is deactivated due to a malfunction.
Therefore, BAS (Brake Assist), ESP
® (Electronic Stability Program),
EBD (Electronic Brake-force Distribution) and PRE-SAFE ® are also
deactivated.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit a qualified specialist workshop.
If the ABS control unit is faulty, there is also a possibility that other
systems, such as the navigation system or the automatic
transmission, will not be available.
!
The yellow ABS warning
lamp is lit while the
engine is running. G
Risk of accident
The on-board voltage is too low. ABS has been deactivated due to
undervoltage.
Therefore, ESP
® , BAS and PRE-SAFE ® are also deactivated.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Switch off consumers that are not required, e.g. the rear window
defroster or interior lighting.
ABS will be available again as soon as the vehicle's on-board
electrical system voltage increases.
If the warning lamp is still on:
X Have the battery and alternator checked at a qualified specialist
workshop.
!
The yellow ABS warning
lamp is lit while the
engine is running. Self diagnosis is not yet complete.
X Carefully drive a suitable distance making slight steering
movements at a speed above 12 mph (20 km/h).
Warning and indicator lamps in the instrument cluster
249
On-board computer and displays
BA 164.1 USA, CA Edition B 2011; 1; 2, en-US
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Version: 3.0.3.5
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