Mercedes-Benz M-Class 2014 Owners Manual - Manual (Page 311)

Display messages Possible causes/consequences and M Solutions
Cruise Control
Inoperative
Cruise control is defective.
X Visit a qualified specialist workshop.
Cruise Control
--- mph A condition for activating cruise control has not been fulfilled.
You have tried to store a speed below 20 mph (30 km/h), for
example.
X
If conditions permit, drive faster than 20 mph (30 km/h) and
store the speed.
X Check the activation conditions for cruise control
(
Y
page 191).
Display messages
309
On-boar
d
compu
ter
and
disp
lays
Z