Mercedes-Benz 2008 M-Class Operator's Manual page 420

Display message
ESP
Unavailable
See Operator's Manual
Possible cause/consequence
®
The ESP was deactivated because
of insufficient power supply. The
charging voltage has fallen below
10 volts.
The brake system is still functioning
normally but without the ESP
available.
®
If the yellow ESP warning
lamp v flashes while driving and
this message appears, the 4-ETS has
switched off to prevent overheating
of the drive wheel brakes.
The self-diagnosis has not been
completed yet.
Possible solution
When the voltage is above this value again, the
®
ESP is operational again and the message in
the multifunction display should disappear.
If the message in the multifunction display does
not disappear:
®
Have the generator (alternator) and the
battery checked.
Have the system checked at an authorized
Mercedes-Benz Light Truck Center as soon
as possible.
As soon as the brakes have cooled off, the
4-ETS switches on again.
The message in the multifunction display disap-
®
pears and the ESP
out.
The display will clear after driving a short
distance at a vehicle speed of above
12 mph (20 km/h).
Practical hints
What to do if ...
warning lamp v goes
419