Owners Manual

Problem Possible causes/consequences and M Solutions
h ! : b
The yellow ESP
®
, ABS
and ASR/BAS warning
lamps, and the red
brake system warning
lamp light up while the
engine is running.
G
Risk of accident
EBD has been deactivated due to undervoltage.
The battery may not be being charged.
The rear wheels could lock sooner than expected when you apply
the brakes.
X
On vehicles with steering wheel buttons, also observe the
messages in the display (Y page 199).
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X
Do not drive on.
X
Consult a qualified specialist workshop.
b
The red brake
system indicator
lamp is lit while
the engine is
running. A
warning tone
also sounds.
G
Risk of accident
There is insufficient brake fluid in the expansion tank.
X
On vehicles with steering wheel buttons, also observe the
messages in the display (Y page 199).
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X
Check the brake fluid level in the expansion tank (Y page 173).
X
If the brake fluid is below the MIN mark: do not drive on!
X
Do not add brake fluid. This does not solve the problem.
X
Consult a qualified specialist workshop.
b
When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is
running.
A warning tone
also sounds.
G
Risk of accident
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could
change. There is a risk of the trailer overbraking and of you losing
control over the truck/trailer combination.
X
On vehicles with steering wheel buttons, also observe the
messages in the display (Y page 199).
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X
Do not drive on.
X
Consult a qualified specialist workshop.
:
The yellow ASR/
BAS indicator
lamp is lit while
the engine is
running.
G
Risk of accident
ASR has been deactivated due to a malfunction.
The engine power output may be reduced.
X
Drive on with care.
X
Consult a qualified specialist workshop as soon as possible.
190
Troubleshooting
Practical advice